If I have wired up a room thermostat incorrectly (and this is quite possible!), would this have an adverse affect on the programmer/timer? Both items are Honeywell and, unfortunately, due to their ages I do not know the model numbers. By adverse affect, what I mean is, could an incorrectly wire room thermostat stop the programmer/timer from switching on/off the central heating at the set times? The room thermostat when turned down, does turn off the boiler, and likewise, when turned up, does turn on the boiler. Is the wiring from the programmer/timer some how connected to the room thermostat?
Room Thermostat
- Thread starter simmodave
- Start date
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Usually the wiring comes from the timer to the room stat then back to the boiler....however there operation is entirely depedant on the boiler model and system type eg combi, s or y plan system.
If ya roomstat is old then its probaley mechanical so will work on 2 core may have a N but not essential. If it will wire for temp rise or temp fall then it can be wired wrong. what it opertaes depends on the system u have, whats the fault?
The problem I have is that the boiler does not appear to recognise the programmer/timer, i.e. it does not turn on/off the central heating at the set times. Did have a conventional boiler but now have a condensing boiler. Strangely, it does appear to turn on/off the hot water?
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Sounds like you have a sticky zone valve and its keeping the boiler on!
is ya boiler a combi or do u have a cylinder . they might of got ya cylinder stat & roomstat wires mixed up if u have a cylinder, That would give u heating untill the cylinder got hot but not heat the hotwater when the house was up to temp,
Perhaps I should be a little more honest/open here? When I fitted the room thermostat a good few years back, it kept blowing the fuse (?). To get around this I set both the Heating and Hot Water to constant on the programmer/timer and just turned up/down the room thermostat to turn on/off the central heating. Not ideal I know, but I was happy with this set-up. Last weekend I had a new boiler installed (condensing). The fuse no longer blows and the timer goes through it cycle, i.e. the red light on the timer comes on at the set time and goes off again at the set time (to indicate heat or hot water on/off) but the boiler does not do likewise - although, like I have said above, I do believe it is turning the hot water on/off (but not 100% certain).
I think whoever fitted ya new boiler should of had the wiring sorted out, depending on what boiler it is the old wiring may not be correct. If u have zone valves the micro switchs on some boilers have to be the roomstat link.
did u fit the boiler or did u pay to have it done?
Hi Bab. I payed to have the boiler installed and it is certified. The arrangement was for the fitting of a new boiler, pump, 3-way valve and 4 x TRVs - no mention was made of external controls as these were already in place.
all i can say is get them back. if they installed it they have a duty of care to see that it operates properly & havent taken enough time checking it out after completion. We all get caught out now & again but should take the rough with the smooth
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