My central heating comprises a Baxi Duo-Tec Combi HE with a Honeywell Evohome Controller (latest Wifi version), wireless relay box (BDR91) and 6 Radiator Controllers (HR92). Is there a frost thermostat fitted? I have a wireless thermostat and my central heating is coming on when turned off but not all rads, recently had to get an installation certificate done as selling as didn't have one as new heating system was done as private job 3 years ago, but since i have had a boiler company out check and register my boiler with gas safety i have had this problem i move on Tuesday help !!!! The Nest still turns the heating on/off when it is turned up/down unless the central heating comes on of it's own accord, at which time the boiler seems to do as it pleases. It's possible your furnace will run when the blower motor is off; however, that's rare. Nest turned "off" the heat after the temperature came up. Hi there, First time posting so hope can be of assistance. What could it be, it is really worrying me because i am on a gas meter and it is going to cost me a fortune. 1) The Heating will come on generally up to 1 hour prior to a time clock setting and this is known s the "Warm up" time, this is designed to warm the house up to reach your desired temperature by the set time in your time clock I noticed the temperature in the house was rising, so I checked the thermostat; it showed 82 degrees inside, but the thermostat was set to 75. Your blower should run constantly until the heating cycle ends. In normal operation, your furnace blower fan should come on 1.5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. I turned the thermostat off and the heat remained on. does this mean central heating fluid is mixing with domestic HW? The other day, we noticed it was drafty (our house is cold anyhow in general) and I found that cold air is coming out of the air vents when the heat is not on. But I noticed that when the hot water was on ( I usually have it for a couple of hours a day) some of my radiators were still heating up. I turn it down to 68 degrees, but the inside temperature did not lower. So heating not required. What if you cannot turn your heat off? Some very hot, some luke warm, some barely noticeable. I turned off the wall thermostat which appeared to turn off all which is fine given avrg. But on the rare occurrence it does, there wouldn't be any air blowing over the heat exchangers which would cause your furnace to go off. We had the heating on twice a day over the winter on the timer. But at 3 AM I woke up to all the radiators lightning hot and the Nest reporting that the heating was turned off. I had to finally shut it off by the circuit breaker. With all that nice weather last week I turned my central heating off. Also noticed that hot water takes longer to reach the tap . When the heat is on, the warm air blows, but otherwise, it's blowing cold air - it almost feels as if it's A/C air. The worry is usually caused by a fear of overheating, like boiling a kettle with no water in it, but in reality, it’s unlikely to cause any damage or risk. So if we manually turn the programer heating to off or the programmer automatically as part of the program turns it off, heat still gets chucked out of the radiators and the boiler still remains on and the pump in the airing cupboard. I set the wall controls so that the heating would only come on if it was below 22 degrees (which it hasn't been yet) but noticed that the boiler is constantly making a noise. ! central heating on then turns off when hot water on by nads » Mon Mar 03, 2008 2:14 pm Last post by Oliver_murphy Tue Mar 04, 2008 7:48 am We have forced air heat. We sometimes get questions from people with radiators that produce heat, even when the heating is off. If the Warrington home’s furnace turns on and then a short time later shuts off, this is known as short cycling. I pressed reset on the thermo - same. If your furnace won't turn on, it can be frustrating.If you’ve read some of our articles, then you know that ASM-air started as a small, U.S. Veteran-Owned business that built its reputation on giving straight, honest answers; this article will be no different. If the heating is coming on when it is set to OFF, then the system requires further investigation. When most people think of heating problems, they think of inadequate heat or heaters that do not work. Not only is short cycling hard on your equipment, but it also greatly reduces the efficiency of your furnace. Our heating setting is always in the on setting. That said I noticed the room temp rise to 26deg yesterday, window open and setting at 9deg, so i dont think it's worked out as hoped. The other day the central heating mcb tripped and after resetting the heating is constantly on even when the timer says off. I turned the hot water OFF on the control panel and move the cylinder thermostat from 50 ... Not there tonight but plumber coming again ... change the diverter and clean out mega filter. It is still coming on the old times. It is called short cycling and is likely to make your heating bills more expensive and, in the long term, will cause damage to the boiler. Yet radiators get hot especially when hot water us running. Vaillant boiler firing up when heating is off I've moved into a new flat that has a vaillant boiler. The boiler was clearly on and running. I had a plumber come round who told me the valves are working. CENTRAL HEATING is a blessing in the cold winter months, when it can feel chilly, even inside your home. Now if we have the hot water set to on, the heating comes on as well. I also live in the UK and my Nest used to do the same thing before I turned off all of the Nest Sense options. If so, if the temperature drops below the setting of the frost thermostat this will generally over ride all other settings. The only way to turn it off is to turn the boiler off until the radiators cool down. First, it is important to realize that a furnace which is “short-cycling,” as we call it in the business, probably means that its safety features are working properly, so breathe a sigh of relief. We've had our heating button set to off all summer, as you'd expect, but the other day the wife turned it on for an hour just to warm the house through. Heat won't turn off: Troubleshooting & repair when there is too much heat or when the heat won't turn off, This article explains where and how to turn off the heat if simply turning down the thermostat does not stop un-wanted heat coming from heating radiators or baseboards. if i run the hot tap the radiators get hot when the central heating is off.i have pulled up the pin on the diverer valve which sticks, and left the actuator off the top.so is it possible that the valve itself is leaking/faulty? My central heating stays on even when turned off at the controller or the thermostat. What to Do If Your Furnace Keeps Turning On and Off: Warrington Heating Tip. Central heating is turned off from programmer and also all rhe way down from thetmostat and also from boiler heating knob. We have a worcester bosch Greenstar Ri installed about six months ago. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. Lowering the room-stat temp does still turn the heating off. The best way to check this is to hold your hand up near the vents to see if there is any air coming … As the title suggests when our Gas Central Heating is turned off at the wall controls the radiators stay hot and the only way to make them go off is to go around and physically turn off all of the individual thermostats on them. Any advice would be appreciated. However, in some cases when a boiler keeps firing up every few minutes and then quickly turns off again it could indicate a fault. If we turn the heating on manually via the programmer in the airing cupboard, or timed automatically to come on, either way it will then not turn off. I turned it all to holiday mode - it is still coming on the old times. Central Heating Turned Off But Radiators Still Hot, Why? About 4 days ago my heating started coming on even though the thermostate was on 0 so i turned the heating setting off on the boiler but it is STILL coming on, at 1st it seemed to be whenever i ran the hot water but this morning it came on before i was out of bed and no water had been run. I haven't noticed that it's coming on at specific times. If your furnace keeps turning on and off repeatedly, it can be stressful at best, and cold or downright uncomfortable at worst. Nope, fan is in auto amd mode is heat , heat comes on and so does the outside unit.not a heat pump , also i am getting 22 v at C and Y …at C and W i am getting 24.7v … it should be a bad tstat..but when i jump off at board with tstat in off mode.Y to C , heat also comes on with out side unit. Diagnose & fix heat that won't turn off when it should: here we discuss various causes of too much heat or of a heating system that does not shut off whenit should. People often worry that turning off their water supply will adversely affect their boiler. http://www.thamesboilers.co.uk Update: I've moved house, so Just Central Heating is no more. I amended the times a week or so ago as it is much warmer. Tado TVR's should be designed to lock into housing and not screw down only. Inside temp is 20deg. Up till now my heating has been working fine, on/off with timer, room-stat and tank-stat etc. If you find that the heating is coming on outside of the pre set times this is usually due to one of two valid scenarios. I came home Friday , heating on, came home today heating on at 15.40 it goes off at 12.15 the diverter switch was on heating. One of the radiators even gets warm when hot water on and radiator thermstat is turned off (tested with heat on and hot water off--radiator stays cold, so valves are working and hot water is somehow getting into this radiator). 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