It just seems that if the temperature falls below what I want it to be when the timer is on, the heating will come on even if its timed to be off… Oil central heating comes on at random times, even though the clock is set to OFF. They can also function without electric power for longer periods. The Y plan valve was operating correctly, I checked that, after switching the FCU on and off it sorted itself out. I amended the times a week or so ago as it is much warmer. The Worcester Bosch timer is a user-friendly analogue timer for setting heating time periods. We had the heating on twice a day over the winter on the timer. Why do you ask if I prefer ‘energy efficient’ or ‘comfort’ on the Hive Active Heating 2 thermostat? I know that the cylinder in the airing cupboard is very warm when the boiler is firing and cools down when I turn the boiler off. Heating will come on although contol shows heating is off. It may seem odd to want to stop your boiler from doing what it was designed to do. However, the boiler is still firing up intermittently, more than an hour and a half later and the pilot light keeps flashing green and after a while, it would turn amber (as if to switch off) but then it flashes green again. I have thermostats on all my radiators which were fitted in January this year. I've went through and turned any set times to off, but still randomly coming on. When your home’s heat is turned on, a pump starts and draws water up from the boiler and pumps it to the radiators. Heating, but it could have both, it's difficult to tell when the timer is turned off. If yours is heating even on fluff no heat and the element is not grounded out then I believe the timer must be bad. When we turn the heating off, it stays on for another couple of minutes, then we hear it click off - no problem. I have a Megaflow system with potterton profile boiler and Honeywell 9400 programmer.Up to now it was working fine .After draining the system to add fresh inhibitor , the central heating now only works when I turn on the hot water switch.The system was plumbed with separate motorised valve for hot water and separate for central heating,If I switch on the central heating … Problem is that when the thermostat is turned down so that it is "off" the Central heating … I have a regular gas fired boiler, hot water tank, a central thermostat in the hall and individual thermostats on all the radiators bar the ones in the kitchen and bathroom. Help needed its red hot in here . Thanks. I turned it all to holiday mode - it is still coming on the old times. ... Cental heating comes on when timer is off! When your time control is on, if the room reaches the set temperature the thermostat will override the time control and turn off your heating. Recently moved to an apartment with gas central heating (which I've never had before) and I'm cofused as to why the heating keeps clicking on, and the boiler keeps firing up. 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 … Re leaving heat on all the time vs intermittent heating: You say If you’re home is very well insulated, you are better off leaving the heating on at a set temperature, where the thermostat will work with the boiler to maintain the temperature relatively easily, since there is little heat loss occurring. In our recent heating survey we found that around two thirds of people with central heating have a timer to turn the heating on or off. The thermostat still controls whether it comes on or off, but it still comes on when the programmer is set to off. The HW works ok. And I witnessed the fault when I went to look initially, the heating and hot water where both on, the hot water is always set to off, and the heating wasn't within its set demand time. Can anyone tell me why my central heating comes on by itself: the radiators get hot and stay hot for around 1-3 minutes then the system turns back off again. Hi, I hope that some kind soul out there might help me with a Problem with a Worcester 24cdi combi boiler. Progress to next rank: 25%. If the heating on the boiler is set to 'ON', then if the thermostat is turned down to 15C, for example, the heating will still come on if the room temperature falls below 15C. http://www.thamesboilers.co.uk Update: I've moved house, so Just Central Heating is no more. But only half have thermostatic valves on at least some of their radiators. However, this is a dilemma faced by some homeowners as they seek to find a way of getting their boiler to turn off. Have central heating system controlled by Lifestyle LP522. I can turn radiators off manually. I had a plumber come round who told me the valves are working. Otherwise all that is happening is the boiler is 'cycling' - which means it is heating the water in the sealed part of the system heats up to 70, the boiler turns off, the water cools down to say 60 and the boiler starts again to repeats the cycle without any useful heat ever having been taken out. Any ideas? A boiler timer will turn your heating on at a certain time each day, whereas a programmer will allow you to turn your central heating on at different times on different days. It is still coming on the old times. And … The hot water and central heating are both controlled by a conventional digital control panel, set to turn on and off at predetermined times. 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. It is called short cycling and is likely to make your heating bills more expensive and, in … Hot water from the boiler rises and travels by natural convection up to the radiators. Although, when the programmer is due to come on (at certain time) this still works and the boiler fires … This issue can be equally confusing and inconvenient as it could cause your household to become too warm, wasting energy and … Vaillant boiler firing up when heating is off I've moved into a new flat that has a vaillant boiler. How do I Boost my heating and hot water on the Hive Active Heating 2 thermostat? The heating does "work" and get hot otherwise. 3 posts • Page 1 of 1. by Ian Graham » Mon Jan 19, 2009 5:44 pm . If you’re not at home or are in bed asleep, then the heating doesn’t need to be on. Wow what a superb message board , right i believe i have the same problem has cez-raf yesterday i knocked the heating off on the timer so i could just have hot water but my central heating stays on !!! My query is can our oil-based central heating system be left to run on a timer (we propose to have the heat come on for an hour or so a couple of times during each 24 hour period)? Hi there, First time posting so hope can be of assistance. This can happen any time throughout the day and night, and you can hear the system kicking in. I have a problem with my boiler where it still comes on even though the programmer is switched off. The high is 20C the low is 15C and the heating control on the boiler is left on 24/7 in … I jumped the thermal fuse wires, just to be sure it was the reason the dryer wasn't coming on, and it is. The only thing is the timer wouldn’t cause the thermo fuse to blow out twice. One day we had to keep turning it on and off about ten times to get it to turn off and stay off. Any ideas? So, I've gotten another fuse but it's still heating without running and the timer … 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). The heating is definitely off though as the radiators have gone cold. Sounds like a fault somewhere - save time and effort and get it fixed by a engineer. If your furnace keeps turning on and off repeatedly, it can be stressful at best, and cold or downright uncomfortable at worst. Mechanical timers activate boiler controls at the end of a specified time. Sometimes this still doesn't work and we have to leave the boiler physically off for an hour or more. ken Rank: Labourer. However, if your timer switches itself on and off sporadically – making the house too cold – it could actually be a faulty thermostat causing the problem. 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