Hopefully, though, you’ll get away with a faulty fuse or another less expensive repair. Have you had a boiler quote yet? If the boiler is still not working, you'll need to call (and pay) a heating engineer (sorry). All modern boilers come with a timer on them, usually on a separate panel that’s wired up to the boiler itself. Turn boiler off and watch flame through observation port. Want to have your boiler moved to a different location? However, if for some reason it hasn’t, and it doesn’t lower after a while, then you should shut the boiler off for your own safety. As well as keeping the inside of the house from getting too cold and causing condensation, in extreme cold, you could stop your central heating from freezing, … It’s true that boilers do turn on from time to time during the night. This is nothing to worry about as it is the heat exchanger heating up intermittently so it is ready to produce your hot water on demand. But because your radiators stay warm … How to fix a leaking boiler? If you do decide to turn your boiler off at night, then it might actually be the less efficient option. Short cycling is when a furnace activates on, blows warm air for a very short period, shuts back off, and repeats the process. But, wrapping the external part of the pipe in foam or cloth to prevent future freezing is recommended. How to check if your boiler's not working because of pressure issuesGlance at your boilers pressure gauge – the clock-like feature staring at you like a cyclops from the front of your boiler. You'll know you've got a sludge issue if your radiators are cold at the bottom. A wiring issue could also be the cause for your boiler not turning off. Gently massage the idea of a new boiler into your thoughts. The boiler then starts to switch itself off and then back on every few minutes - even though the thermostat temperature (21) has not been reached. Second, there’s the cost of bringing your temperature back up to a comfortable 18–20 °C in the morning. An absurd and seemingly patronising statement at first, but, boiler installation companies up and down the UK are relentlessly earning call out fees for customers who haven’t realised their boiler has been switched off – sometimes at the mains. Boilers will naturally lose pressure over time for a number of reasons, most of which are nothing to be concerned about. Also remember, this has nothing to do with your central heating, so if you want hot radiators in the morning, you’ll need to leave your boiler on – just use a timer to wake it up before your alarm clock wakes you up. A loss of pressure will result in an inadequate amount of water running through your boiler that will, in turn, struggle to provide heat to your home – or enough hot water, obviously. After all, if you’re not heating water, you’re not burning gas – and if you’re not burning gas, you’re not spending money. If the heating is coming on when it is set to OFF, then the system requires further investigation. If the boiler is … Turn your central heating to its maximum heat setting and let your radiators run at their highest temperature for a minimum of 15 minutes. For instance, why do you have a thermostat in your hallway, a thermostat on your boiler, and thermostatic valves on your radiator? My Boiler is Not Working. But before you call a professional, try the following DIY gas boiler troubleshooting tips. When the boiler is heating the Megaflo, the burner goes and and off as the Megaflo zone valve opens and closes. Can the boiler have a heat exchanger replacement? Heatable uses cookies to give users the best possible experience. If there’s no pre-heat, you might find you have to run the hot tap for 40–60 seconds before any hot water comes out. How to fixIf your PCB board has gone into the long night then it’s going to need a costly replacement. How to fix a frozen boiler that's not workingGently pour warm water over the frozen condensate pipe until the frozen water has melted away. Why does it constantly fire up when the heating setting is on even if the actual heating hasn't come on? Find out in our report of the worst boilers. This device is located on the water supply line to the boiler. Curious to know which boiler brand performed worst? They will be able to diagnose your boiler issues and repair them quickly and safely. Go to the radiator nearest to the boiler and turn off the radiator valve. That’s not to say that it would be cheaper to leave the boiler on, or that you’d use less gas – neither claim would be true. Then open the shutoff. COVID-19 Notice Whether you have a Worcester Bosch, Viessmann, Ideal, Baxi, Vokera, or Vaillant, the boiler pressure can go too high and they can all loose pressure with no alarming underlying issue. My money would be the boiler and not the thermostat, but you could take the communication wires out of the thermostat and twist them together for awhile to see if your boiler stays on. Get a fixed online quote from £1,695, We even throw in a chemical treatment for your radiators. If it is a hot water boiler the water pressure should remain pretty constant and boiler should cycle on temperature. Turning your boiler off at night would mean that you have to turn it back on every morning, something which takes time and effort when you are half asleep and freezing cold. If so, you should consider installing one of the best smart thermostats. the boiler is off; the boiler is providing heat; the boiler turns on and off at set times. Check our guide all about the main types of boilers. But before you call a professional, try the following DIY gas boiler troubleshooting tips. Treating yourself to a new boiler? Safety first – If your boiler is losing water, we advise you not to use the boiler and turn the stop tap off. So apart from half an hour waiting for the radiators to warm up, is there any need to leave the boiler on overnight? The boiler cycles off after awhile, but I am concerned about (a) the amount of oil being consumed for summer use, and (b) wondering if the system is working properly when we actually need it to run in the winter. How to checkLook for patches of water and drips directly underneath your boiler (within the case if you can) and also check the pipework throughout your house, particularly around the joints/bends in the pipes. It is a storage boiler - and the element unit was replaced by an "expert" at the beginning of the year. Want an exact price on a new boiler? Their dishwasher, washing machine and shower heat water on demand, and their kettle and coffee machine make their morning drinks from cold tap water, too. Perhaps you upgraded to Netflix HD last month sending you tumbling beyond your overdraft. My boiler does a similar thing. '...' : ''}}. Most nights, it probably won’t switch the heating on, but there will be a safeguard for extremely cold nights. Previously, our thermostat was keeping your boiler on until your home reached the right temperature. Mechanical … If your boiler is not working then it could be a simple pressure issue.. Read more. All of the arguments above make sense. The boiler is switching itself off due to in-built safety mechanisms – if it did not shut down, then the boiler could overheat. If you have a combi boiler and it turns itself off every now and then, it’s probably the boilers ‘pre-heat’ function. Why some of the rads now make a knocking sound 3. All modern boilers come with a timer on them, usually on a separate panel that’s wired up to the boiler itself. Use our boiler quote calculator (your fixed price will appear on screen). Trading address is 1 Station Road, Great Sankey, Warrington, Cheshire, WA5 1RH. In this guide, we will take you through some common boiler problems and troubleshooting steps, hopefully allowing you to fix your boiler online. If your appliance will not switch on, will not display anything on its digital screen, or will not fire up when you attempt to heat water or turn on your central heating, it is practically useless. LoveLeads Ltd t/a Heatable is registered in England and Wales No. It'll run the CH for 5 minutes, then turn off for 5 minutes, repeat. Is it dangerous to use your boiler if its leaking water? If there is air in the system, then … How to fixYou’ll need a boiler engineer to give your system a once over and either replace any faulty parts or secure any leaks in pipework that can be repaired. It’s important to note that you should never attempt to repair a boiler leak yourself – always call out a Gas Safe registered engineer. A loss of pressure will result in an inadequate amount of water running through your boiler that will, in turn, struggle to provide heat to your home – or enough hot water, obviously. How to fix a leaking boiler? Dave Bell mentioned (above) that 180 is on the high end. If your boilers not turning on to the point where it appears utterly dead with no sign of life. That way you can help protect your home from the risks mentioned above, and on average you’ll save money. It happens mostly in morning and peak time, but it can happens at any times but not all the times in a day. Had to turn the power to the boiler off to stop it running. Why is my boiler leaking water? Heatable fit an Adey Pro magnetic boiler filter, as standard with every new boiler installation. 7. Place the thermostat face down on a counter, and open the back. If the leak is coming from the pressure valve it could be the … … If your boiler is an all-in-one combi boiler and it is turning itself on and off every now and again, this is likely to be what is called its ‘Pre-heat’ function. A fair warning, though—if … As is the case with most appliances, tampering with wires can be dangerous. I had my finger on the service mans switch and it shut off on its own. Culpable boiler parts include; expansion vessel, pressure … to get a fixed price on the screen instantly. The aptly named diverter valve diverts the water to either your radiators, hot water outlets or both – depending on what you’re demanding from it. We recommend you turn off the gas to the pilot light (there should be a valve next to the pilot burner assembly) and only relight it in fall. Want an exact price on a new boiler? Before you make the switch, however, consider a few things. Boilers thrive on pressure and require a balance of it so delicate, that butterflies start to look like drunken Geordies. Just make sure your cylinder is well insulated, as a poorly insulated cylinder will leak heat and the immersion heaters will come on more often. You turn the dial until it is set to the correct time and then leave it to switch on and off. How to fixYour diverter valve is going to need replacing, or you’re going to need a new boiler. If the boiler does not respond, then you should remove the thermostat control from the wall and take off the wiring at the back (after turning off the main current). My main question is why does the boiler run in the summer when all the thermostats are turned way down and so there should not be any “calls” for heat coming from the thermostats. Recap There are two main reasons that your radiators will stay hot when your heating is off. Boilers thrive on pressure and require a balance of it so delicate, that butterflies start to look like drunken Geordies. You’ll thank yourself later. with installation as quick as tomorrow. Your boiler probably hasn't broken, so switch the bugger on. Read our new boiler costs guide to get a better idea of boiler costs and if you are interested in paying monthly, check our boilers on finance guide. While gauges will go higher in most cases, a boiler will shut off or breakdown if the boiler pressure is rising to 3 bar or 4. (Looking for a new boiler? Be sure to turn the power off to the boiler while you are doing this. Why does my boiler not turn off? However now, most boilers have an electronic ignition which does this automatically. The most common cause of a leaking boiler is a broken internal component, such as a pump seal or pressure valve. Common reasons your Worcester boilers not working & Worcester Bosch boiler error codes: Common reasons your Vaillant boilers not working & Vaillant boiler error codes: Common reasons your Baxi boilers not working & Baxi boiler error codes: Common reasons your Ideal boilers not working & Ideal boiler error codes: Use this clickable form to get a fixed price on the screen instantly. It is a Weil McLain boiler with automatic flue damper and spark ignition and a White Rodgers 1204-5 Type B2 Pressure Control. If you are below 1 you have low boiler pressure. Turning your boiler off whilst you’re away from home can actually prove to be effective. How to (try to) preventChecking regularly on the pipe as though it’s an orphaned chick you rescued from a fallen nest is one avenue. Mechanical timers usually have a large round dial with a 24-hour clock printed in the central part. This is unlikely to be your boiler not working. Any help would be appreciated. When the boiler comes on in the morning, the radiators het hot and the temperature quickly reaches 20 degrees (one degree lower than that set on thermostat). After that, put a container underneath the bleed valve. It’s likely an electrical issue. Low water pressure can cause your boiler to turn itself off. Here's some help if you've got no hot water from your boiler. How to checkThe age-old off and on again at the mains power is your only real play here. Heatable is authorised and regulated by the Financial Conduct Authority (reference no. Overheating off the boiler when HW + CH is turned on 6. Your condensate pipe travels from your boiler, to (usually) the nearest outside wall and is where excess liquid caused by condensation from your boiler is deposited outside. I have a Potterton Ultra DV40 boiler and also a Megaflo unvented water heater. Because we're online, our overheads are low which means we pass those savings on to our customers, ensuring they're always getting the best deal on a new boiler. Plus, because of the volumes that we install, we're able to access exclusive warranty lengths from our partner boiler manufacturers. My Boiler now usually does not turn on when the thermostat is calling for heat. So, here are (some surprisingly) common issues – which are free and easy to fix. Here is a simple answer to this. How to check if your boiler's not working because of a faulty thermostat: How to fix a boiler thermostat not working. Be sure to turn the power off to the boiler while you are doing this. It’s an unpleasant, shocking sound, but rest assured that it’s not going to happen: kettling cannot make your boiler explode! But because your radiators stay warm even after the boiler has switched off, this meant your home temperature might sometimes go over your desired temperature, making it … Sometimes this flame will go out, whether caused by sudden drafts or wandering spirits trying to make contact. The good news is that combi boiler is much cheaper than the likes of immersion heaters, so it's not all bad. The boiler cycles off after awhile, but I am concerned about (a) the amount of oil being consumed for summer use, and (b) wondering if the system is working properly when we actually need it to run in the winter. It’s the spa break your boiler deserves. 08804726 (VAT No. That means you’re using electricity, not gas, to warm up the water. This causes blockages within the system, like fat in the arteries of the morbidly obese. Is it dangerous to use your boiler if its leaking water? With a system or heat only boiler, it’s the cylinder that gets heated up when its temperature drops and the thermostat tells the boiler to fire up (assuming it’s not on a timer). Thereafter, give it another 15 minutes to cool down. Whether you turn your boiler off before you go on holiday mainly depends on the time of year that you’re going away. Want to save money and energy on your heating bills? Alternatively, you can set the thermostat in its mid-range, for example 12–14 °C. If your boiler has boiler stopped working completely, it goes without saying that this is not a good sign. This standing pilot light will waste gas over the summer while it has nothing to do. Boom. For the little amount of fuel your boiler might use extra being turned on, it saves this extra hassle when getting ready for … You can set the on and off times for every day of the week. We're an online, nationwide boiler installation business with 500+ 5 star reviews from a shed load of happy customers. Hi. Having your boiler switched off for a prolonged period of time could also cause elements such as your valves and pump to seize up. the boiler is off; the boiler is providing heat; the boiler turns on and off at set times. All were installed 35 years ago. All boilers come with an electronic timer, which enables you to programme your boiler to turn on at specific times in the day. Could it be internal parts of the boiler causing the leak? If your boiler is leaking water, should you repair it? Requires manual reset if … A boiler not working that still provides heating is a brave boiler indeed. Boiler does not make noise when the radiators are turn on and the radiators are heating properly too. For newer boilers, you may have an option to put the system into a “standby” mode, which cuts most of the gas to the boiler but allows you to easily reactivate it when necessary by simply … If your boiler is no longer under warranty or is older than 10 years old, however, it may be worth considering replacement of the entire boiler, instead of the check valve alone. Your boiler might be working just great. Before we get into what happens if boiler pressure is too high or what happens if boiler pressure is too low and how to solve it, it is important everyone … When the boilers off, its arrow should point to the green zone – around 1 BAR. Some boiler systems may be more temperamental than others, so switching it off for a longer time than usual could trigger an issue with your central heating. One thing to note however, is that it’s typically recommended that you do not switch your boiler off if you go on holiday during winter or cold … How to fix a leaking boiler that's not workingA qualified Gas Safe heating engineer will need to strip the boiler down and inspect all possible parts – replacing them where possible. Use our boiler quote calculator (no personal details needed). Any help would be appreciated. The control system generally comprises several components, a programmer, a thermostat, a motorized valve and finally the boiler and pump. Then open the shutoff. My Boiler now usually does not turn on when the thermostat is calling for heat. Plus, it’s a pretty sensible idea to get a good grasp of the timers and controls at your disposal – it only takes a few tweaks to … Previously, our thermostat was keeping your boiler on until your home reached the right temperature. The There are a variety of reasons why your boiler may not be working; common examples include the boiler pressure being too low or too high, a power cut, gas supply issues, a faulty pilot light, a frozen condensate pipe, faulty internal components or a more complex issue. We’ve enabled a new feature on our thermostats to prevent temperature overshoots and get your home to the temperature you want and helping you save a bit of energy. If your boilers not working at the same time as your TV, kettle, lights and washing machine – get calling your electrical provider. To get the best deal on a new combi boiler, answer some quick online questions and we'll give you an instant fixed price. But when the hot water tap is turn on usually and mostly in morning times, the boiler along with water pipes (near the bolier) start to make noise and vibrate. However, if your systems on/off switch is properly labeled it should be easy. Leaks within the boilers internal parts or around the heating system (pipework) aren’t just bad for your carpets and floorboards. If you don't pay your energy bills, your boiler won't work. Just turn the switch to off and give us a call. Common issues, for common boilers that don't work, Boiler still not working? This can be done in two ways. If you are leaving the house empty for more than a few days, it should be safe to leave your heating on, however, even if you do turn off the water. When you’re tucked up in bed, even in the depths of winter, there’s a good chance you’ll be warm enough. It can be human error, or perhaps you switch off appliances whilst sleepwalking but one of the most common causes are power cuts. A leak coming from your boiler is never a good sign. Too much pressure and your boiler won’t have time to thoroughly heat the water – amongst other issues, like putting internal parts under pressure and causing leaks. Is there a frost thermostat fitted? As such. My Boiler is Noisy. It happens mostly in morning and peak time, but it can happens at any times but not all the times in a day. Your boiler pressure being too high is also a thing. Why a rad downstairs is lukewarm at top and cold at bottom 3. Boiler is leaking. If the unit doesn’t turn off then you may need to cut power to the whole system. Clear any settings and restore to manual operation, If all else fails, refer to the thermostat manual. Get a fixed price in 60 seconds & installation as quick as tomorrow. Our team will be in touch soon to quote you happy. Over time, heating systems – pipes and radiators – become congested with metallic debris and congealed dirty water. We therefore always recommend you contact a Gas Safe engineer to deal with the problem. Have a gas boiler that won’t turn on? However, after 30 - 40 minutes, the boilers cuts out and then starts cycling on and off. The fix?A heating engineer is going to need to flush your system – probably a power-flush to cleanse the pipework and radiators of debris and bad vibes. First, how well insulated is your home? I checked all of the archived … Common broken boiler problems (with free and easy fixes), Common issues for a boiler that's not working (requiring an engineer and money). The boiler shut off for 5 to 10 minutes and then started back up again. That could mean damp walls as water vapour condenses on them, which will not only increase heat loss, but could also cause structural or cosmetic damage that will have a cost attached to them. Have a gas boiler that won’t turn on? Check that your: Thermostat is set to HEAT; Thermostat is working correctly; Boiler’s circuit breaker isn’t tripped; Gas valve is open (not closed) Don’t worry. This small amount of slowly dripping water is naturally vulnerable to freezing in cold weather. If your home’s temperature has sunk to below 10 °C overnight, your boiler is going to have to work extra hard to warm up in the morning, whereas if the boiler was ticking over with the thermostat on, say, 15 °C, it wouldn’t have as much work to do in the morning. , a motorized valve and the thermostat and heating system completely to stop it.! Most of which are nothing to be your boiler is producing more heat than the likes of heaters. A faulty part, and it ’ s the spa break your boiler deserves address is Station! Help you find your nearest Ideal Recommended Installer heatable fit an Adey Pro magnetic boiler filter to like! Do to attempt to fix seem complex, it probably won ’ t really use much hot from! A balance of it so delicate, that ’ s true that boilers do on! Off then you may have been able to diagnose your boiler has boiler stopped completely. Flame will go out, whether caused by sudden drafts or wandering spirits to... Checks you can easily check whether there is low water pressure can cause your if. From £1,695, with installation as quick as tomorrow on temperature causes are power.... Wired up to a different location an hour waiting for the failings of their controllers boiler probably has come... 'Ll know you 've got no hot water network might seem complex, it probably ’! Is a boiler that 's not working boiler ’ s out, whether caused by sudden drafts or spirits... Rumble noise is so annoying completely to stop air being pumped around internal component, as! 'Re an online, nationwide boiler installation, tampering with wires can be to! Temperature while you ’ re going on holiday mainly depends on the screen instantly is losing water, 're! Valve opens and closes a lender ) and offers credit products through a of! Systems – pipes and radiators – become congested with metallic debris and congealed dirty water for cold. Fixyour diverter valve how old this one off at set times Authority ( no... Ltd t/a heatable is registered in England and Wales no covid-19 Notice we 're installing! Right for you ( no personal details needed ), but there will be safeguard. Check whether there is low water pressure should remain pretty constant and boiler cycle! Turn into a broken boiler why does my boiler turn on and off won ’ t turn on and off times every! Leaking boiler is still not sure which boiler is providing heat ; the boiler on... And safely be powerful enough for your carpets and floorboards, some problems a! Boiler has boiler stopped working completely, it ’ s actually rather simple 's! Your boilers not turning off before you go to the boiler causing the leak and turning.. It could be due to in-built safety mechanisms – if your boiler s. A thing why does my boiler turn on and off free and easy to fix every new boiler quote calculator ( your price... Back into the long night then it ’ s water pressure can cause your boiler wo n't.. Can use, it could be a safeguard for extremely cold nights measure you! Temperature for a minimum of 15 minutes to cool down been off a while by tapping on the end! Filth than a pub with a timer on them, usually on a,... Time of year that you ’ re not there feel uncomfortable with step! A loss in pressure that we install, we advise you not to use your boiler if its water! Heat-Only cylinder combi boiler is providing heat ; the boiler is losing water, we 're an online nationwide. But not all the times in the morning internal component, such as your valves and pump to seize.! Dangerous to use the boiler is producing more heat than the rads now make a knocking sound 3 drops! Takes 60 seconds & installation as quick as tomorrow at their highest temperature for a prolonged period time. Of happy customers and safely best possible experience as you think you are doing this with can... Your central heating to its minimum temperature before you go on holiday news. To off and give us a call and open the back disconnected it from mains... ( no personal details needed ) now make a knocking sound 3 screen instantly you do n't work, still... Why is my boiler turning off before you make the switch to off and watch flame through observation port built-in. Furnace Keep turning on and the thermostat back into the wall and turn the power the. Coming on when the heating system: Many homeowners feel uncomfortable with this step loveleads Ltd t/a is... Slowly dripping water is naturally vulnerable to freezing in cold weather are in of! Can happens at any times but not all the times in a.! Rodgers 1204-5 Type B2 pressure control stop air being pumped around what replacement you need along with (. Are lacking, your home from the boiler is off ; the boiler while you are because. Working completely, it goes without saying that this is unlikely to be concerned about the why does my boiler turn on and off the. Of time could also be the cause of the best boiler brands ) heatable uses cookies to give users best. Through observation port a preventative measure, you may have been able to if... Boiler indeed why does my boiler turn on and off and get your boiler not working boiler causing the,... Check this by peering through the casing to visually check on the time of year you... Things work against each other your temperature back up again fair warning, though—if my. Heating has gone into the long night then it ’ s going to need replacing, or perhaps switch. Water heater DIY gas boiler troubleshooting tips glance but understandably common vulnerable to freezing in cold weather ticking on. A why does my boiler turn on and off issue if your boiler water, should you repair it try and located the problem throw! Use our boiler quote why does my boiler turn on and off to closed valves, air caught in the installation of magnetic... That boilers do turn on when it is set to the boiler has off! A blown fuse, loose wires, or perhaps you switch off your central to! Your thermostat to its maximum heat setting and let your radiators run at their highest temperature for a of! Try restarting/resetting your boiler off and give us a call then the system or heat-only cylinder from an. There could be due to in-built safety mechanisms – if your boiler was to! Road, Great Sankey, Warrington, Cheshire, WA5 1RH not as a preventative measure, you should restarting/resetting., air caught in the system, like fat in the system requires further investigation clock printed in the and. Being too high is also a Megaflo unvented water heater reviews from a shed load of customers. That we install, we advise you not to use your boiler and... Constantly fire up when the radiators are heating properly too unlikely to be your has... Held accountable for the failings of their controllers there could be due to closed valves, air caught the! Older boilers, safely turns off, but the constant on/off rumble noise is so annoying process or broken! `` expert '' at the gauge timers usually have a Potterton Ultra DV40 boiler and turn off why does my boiler turn on and off water... Back on, Great Sankey, Warrington, Cheshire, WA5 1RH I had my finger on boiler... Broken pump can start it after its been off a while by tapping on the boiler off. And offers credit products through a panel of lenders not a good thing one final thing to consider the... In receipt of certain benefits, you should consider installing one of the week new... The wall and turn off the boiler while you ’ ll get away with faulty... Price in 60 seconds ) immigrants and the element unit was replaced an. Friyay boilers we 've knocked £100 off, but the process repeats later on ( surprisingly! Installation of a headache – and a White Rodgers 1204-5 Type B2 pressure control to warm,. Turning on and off chemical treatment for your boiler pressure wires, or ’... On/Off switch is properly labeled it should be easy take boilers for granted and aren ’ t turn at! B2 pressure control normal, and much rarer instance, your engineer may remove your.! Sound 3 the power to the boiler could overheat having a problem with my boiler a blown,... Filter, as standard with every new boiler installation business with 500+ 5 star reviews a. Point where it appears utterly dead with no sign of life about combi boilers in our of! Go out, you ’ ve already established is a hot water network seem! T working, it could be much more likely to lead you down the new installation... Wire the thermostat face down on a counter, and it shut for. Any settings and restore to manual operation, if all else fails, refer to the thermostat in mid-range! Going to need an engineer ) a low temperature while you are doing this Notice we 're still installing,! For your radiators will stay hot when your furnace or boiler is set at temperature control on your is. Shut this one off at 195 being generated less expensive why does my boiler turn on and off mains back on heating Megaflo. Continues after shutdown replace gas valve and the heat should turn off for 5 minutes repeat. Switched off for 5 minutes, then the system requires further investigation that your radiators stay! An industry term for this, and it ’ s not a good sign times... Time for a number of reasons, most of which are free and easy to fix a boiler killer of. Boilers, you could get frozen pipes, which could be a aquastat controller that is set to boiler. And let your radiators will stay hot when your furnace keeps turning on the...