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  1. C

    Radiators warm but not hot (boiler short cycling)

    Thanks for your detailed response. The flow pipe is only slightly warmer than the radiators and the return pipe is only slightly cooler than the outlet. Nothing has been changed recently, a plumber installed a new shower pump although it draws directly from the hot water tank so don't think it...
  2. C

    Radiators warm but not hot (boiler short cycling)

    My radiators are getting warm but not hot enough to actually heat the room properly. I have a SE12 FF boiler with hot water tank, the hot water seems ok (possibly because it has the tank to accumulate it and keep it warm). I checked the boiler and noticed that it fires up for about 10 seconds...
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    Honeywell ST9400C

    I’ve managed to fix the issue so just in case anyone else encounters this problem with this programmer: Scrolling through the set up menu there is a reset parameter (parameter 8 ) which is set to 1 unless you’ve changed the on/off times in which case it will be 0. Mine was still set to 1...
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    Honeywell ST9400C

    I just tested it, the 'click temp' seems to be around 16-17 and heating responded accordingly so thermostat definitely working. Unfortunately I don't have a thermometer to check the room. Interestingly though whilst I left the stat at 20 today, on other days (including this week so not warm days...
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    Honeywell ST9400C

    Hopefully that's worked. Thermostat has been set to 20 all day but right on cue just before 5pm the heating has come on despite the light having been on all day
  6. C

    Honeywell ST9400C

    Hi, I have the aforementioned programmer which is working fine for hot water but not for CH. It seems that no matter what setting the CH is on (timer, continuous, override) it will not come on unless it is a particular time in the evening. For example, if I set the timer to come on at 2pm, the...
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