Hot water from the boiler rises and travels by natural convection up to the radiators. I've went through and turned any set times to off, but still randomly coming on. If your furnace keeps turning on and off repeatedly, it can be stressful at best, and cold or downright uncomfortable at worst. I have thermostats on all my radiators which were fitted in January this year. First, it is important to realize that a furnace which is âshort-cycling,â as we call it in the business, probably means that its safety features are working properly, so breathe a sigh of relief. When your homeâs heat is turned on, a pump starts and draws water up from the boiler and pumps it to the radiators. 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 â¦ Sounds like a fault somewhere - save time and effort and get it fixed by a engineer. 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. Conclusion Itâs no fun dealing with a faulty timer clock, and it can be caused by a number of reasons, from a power outage to a fused spur or your boiler settings. This is handy because it means you can programme your central heating to fit around the way your home is used. Progress to next rank: 25%. The thermostat still controls whether it comes on or off, but it still comes on when the programmer is set to off. Following all this, we now have a further little problem. 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. However, if your timer switches itself on and off sporadically â making the house too cold â it could actually be a faulty thermostat causing the problem. It is called short cycling and is likely to make your heating bills more expensive and, in â¦ 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). Mechanical timers activate boiler controls at the end of a specified time. I pressed reset on the thermo - â¦ One day we had to keep turning it on and off about ten times to get it to turn off and stay off. The hot water and central heating are both controlled by a conventional digital control panel, set to turn on and off at predetermined times. 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)? i have a Valliant condenser boiler, with the central heating on and the hot water off the hot water comes on of its own accord intermitentlly to an excessively high temperature. Hi, I hope that some kind soul out there might help me with a Problem with a Worcester 24cdi combi boiler. The Y plan valve was operating correctly, I checked that, after switching the FCU on and off it sorted itself out. 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 offâ¦ It may seem odd to want to stop your boiler from doing what it was designed to do. 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. So, I've gotten another fuse but it's still heating without running and the timer â¦ This is showing the heating at 01:15 as being very firmly OFF. 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). Although, when the programmer is due to come on (at certain time) this still works and the boiler fires â¦ 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. The high is 20C the low is 15C and the heating control on the boiler is left on 24/7 in â¦ Thanks. We had the heating on twice a day over the winter on the timer. Now we've blown the thermal fuse again, 2 days ago, and I've had someone come and clean the vent in the wall out, which had a good bit of lint in it. Older types of heating systems use a boiler that keeps water hot all the time. Any ideas? The heating is definitely off though as the radiators have gone cold. 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. How do I turn my central heating system off? How do I Boost my heating and hot water on the Hive Active Heating 2 thermostat? Oil central heating comes on at random times, even though the clock is set to OFF. 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. I'm not complaining that the house is warm, but if â¦ Timeswitches and programmers are both time â¦ Any ideas? Ken. When we turn the heating off, it stays on for another couple of minutes, then we hear it click off - no problem. 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. Why do you ask if I prefer âenergy efficientâ or âcomfortâ on the Hive Active Heating 2 thermostat? Time controls work in partnership with your room thermostat. The Worcester Bosch timer is a user-friendly analogue timer for setting heating time periods. During this time the indicator light for the hot water is off. Heating will come on although contol shows heating is off. 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. http://www.thamesboilers.co.uk Update: I've moved house, so Just Central Heating is no more. The only thing is the timer wouldnât cause the thermo fuse to blow out twice. At first I put it down to the timer on the heating, but I have now set all the timer temperatures to a temperature that does not require the â¦ Just get some reviews and quotes or save the time and effort and use the firm that I use called STL Heating. 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. If yours is heating even on fluff no heat and the element is not grounded out then I believe the timer must be bad. Problem is that when the thermostat is turned down so that it is "off" the Central heating â¦ Re leaving heat on all the time vs intermittent heating: You say If youâre 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. 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. This can happen any time throughout the day and night, and you can hear the system kicking in. 3 posts â¢ Page 1 of 1. by Ian Graham » Mon Jan 19, 2009 5:44 pm . The problem I am experiencing, since setting up, is that when the heating switches off at the set off timeâ¦ I amended the times a week or so ago as it is much warmer. The system is controlled by a "Lifestyle 711" timeswitch (standard two timer on /offs per day program))and I have a single thermastat in the hall. And â¦ How do I set-up, view or edit my hot water schedule on my Hive Active Heating 2 thermostat? I turned it all to holiday mode - it is still coming on the old times. 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 â¦ 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. Help needed its red hot in here . A timer or programmer allows you to control when your heating and hot water comes on and when it goes off. I jumped the thermal fuse wires, just to be sure it was the reason the dryer wasn't coming on, and it is. If youâre not at home or are in bed asleep, then the heating doesnât need to be on. But then, even though the central heating has definitely clicked off, it takes quite a long time for the radiators to cool down - way longer than it did before. However, this is a dilemma faced by some homeowners as they seek to find a way of getting their boiler to turn off. Don't pick the likes of BG as they might try and sell you a new boiler - even if you don't need one! ... Cental heating comes on when timer is off! They can be programmed so that you never forget to turn your heating off (or on). Hi there, First time posting so hope can be of assistance. 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 !!! We have a two level thermostat and that is how ours is designed to work. Check to see if it is heating even if the dryer is off and if so something is grounded out or the motor switch is bad. They can also function without electric power for longer periods. This issue can be equally confusing and inconvenient as it could cause your household to become too warm, wasting energy and â¦ Heating will come on although contol shows heating is off. The HW works ok. Heating, but it could have both, it's difficult to tell when the timer is turned off. I had a plumber come round who told me the valves are working. Sometimes this still doesn't work and we have to leave the boiler physically off for an hour or more. Have central heating system controlled by Lifestyle LP522. I can turn radiators off manually. It is still coming on the old times. If your boiler doesnât appear to be working or keeps switching on and off, there could be a problem with your timer or programmer. But only half have thermostatic valves on at least some of their radiators. However, in some cases when a boiler keeps firing up every few minutes and then quickly turns off again it could indicate a fault. I have had a certified engineer to look at it but he cant find anything wrong Merry Xmas and a â¦ The heating does "work" and get hot otherwise. Vaillant boiler firing up when heating is off I've moved into a new flat that has a vaillant boiler. ken Rank: Labourer. With the âteethâ on the dial pressed down the heat comes on and when left up the heat remains off. I have a problem with my boiler where it still comes on even though the programmer is switched off. We will be away for a while shortly and were advised to turn off the mains water supply. For longer periods forget to turn off the mains water supply is set to off which were fitted in this. This year off the mains water supply the thermo fuse to blow out twice the element not. Of assistance and use the firm that I use called STL heating or so as... You can hear the system kicking in out there might help me with a Problem with a Problem with Worcester! 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