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Hi again all, a little teaser you may be able to help me with? First of all, this does not cause me a great deal of pain, more a sense of bewilderment !! I had a new boiler (as above) fitted in September, linked to an existing Honeywell CM721 Wireless Programmable Room Thermostat and relay...

Thanks Tony, it will be fine when you are ready. Steve

Tony, did you get my email with my address for the Sulphonic? Regards Steve

Tony, on its way. SjH

Hi all, sorry for delay in getting back to you, lost a member of the family and have had no time etc. OK, I have done some further investigating and am certain it is not a 'physical' noise, like a bearing, and am starting think along the lines of the DHW heat exchanger as several of you guys...

Thanks all - always entertaining on here. I am in Merseyside (Hoylake to be exact) and we dont have a water problem. It is really soft. A problem some years ago necessitated the heat exchanger to be taken out but was clean as a whistle with good flow when connected to a power hose. I will try...

Thanks all for the replies, I didnt mean to start WW3. The fan was changed last year, so unless a poor build, I doubt the bearings, but, it is something to check. It happens all the time after a long hot water run. Sorry, but groaning is exactly what it sounds like. Aeroplane landing...

I have a groaning boiler !! After running DHW for a while, on closing the DHW tap, the boiler seems to have a big groan as it turns off. It doesn’t do it on CH turning off, so I have ruled out the pump or fan, but can only think that the other ‘moving parts’ are the gas valve and the...

Mr Football Just as an added boost to your confidence - I did the same replacement recently with the 921 ( the Daily version, not the 927 Weekly programmer) and as mentioned by the previous pros, it is a doddle, and incidentally works a treat !! I have my programmer located in the lounge...

Gents I realise it is a while since this thread was started, but I wanted to update. If you recall at the outset, after fitting a new Honeywell Roomstat, I basically had a boiler that I pressured up in the morning, it ran all day absolutely fine, but in the morning after being off all...

Thanks, as always, Tony. Advice taken and heeded. Steve

THanks DP I have always had the DHW stat on full - all seasons, and the CH stat variable dependant on season. But with the boiler being under the control of the roomstat now, I have taken the various elements of advice and heeded ! SB

Tony Check your emails - I sent one to you at 13:00 today Steve

Thanks for those replies. DP - I have independant controls on my combi boiler for CH and DHW temps, but thanks for the input. Tony, I think I confused things earlier. Before I fitted the roomstat I controlled house temp via boiler stat, the level dependant on weather temperature. With...

Thanks Tony first bit makes perfect sense. Im a bit confused with second comment though - even though I am sure it is dumb me just not understanding. As far as I was aware, the Honeywell 'central unit' only has connection to the boiler by way of a pair of contacts, open or closed, based on...

It is very unlike this forum not to be tempted into a reply.... Is there a problem with my question ? Regards SB

Hi again and apologies for posting new thread just after closing the last one, but need a little more advice. You may recall I fitted a Honeywell 927 Wireless Programmer to this system and after various teathing probs all settled down nicely. Previously I controlled room temps via the...

Well, Thanks to all who have taken the trouble to help on this one - as always this forum hasn't dissapointed me. Great Guys ( or goils maybe..) BUT - I think I need to put a full stop on this thread. This Honeywell thing seems to be doing a damn good job. I have it Auto for most of the...

In reply to your prompt response D-H The temps were displayed on the roomstat, 18 deg Target and 16.5 Room Temp. But I have to admit that after that 'slow response' at 16.5, it has been fine and responsive since. If I adjust the offset to match the thermos, will the Target stay the same...