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Thanks again DH did some web reseach last night and discovered that the 200 had been superceded. I have decided to go 'wireless' and am just wondering now about whether to get just a roomstat or go for a programmable roomstat (CMT921). The clock on the boiler went faulty many years ago...

Thanks for that reply D_H I have a Danfoss 102 doing the programming, but my backround in electronics/electrics means I would have no probs complying as you say. so the next Q is which roomstat ? - is the Honeywell DT200 ok - seems simple enough to incorporate. Regards and Thanks again...

Hi I have had several great replies to my questions re this boiler and its past issues, but I have probably the simplest general question to ask now. This system was not installed with a roomstat, (pump always running) and for years I have adjusted house temp via boilers stat.ie quarter on...

Tony I will re-email at 0900 this morning with my contact details and telephone you this evening at 7 - My home number is 'number withheld', but my mobile starts 07860 229 Steve

Tony Tried to contact you last night and tonight via numbers on your DIYNOT profile - but went to a/machine and you advised not to leave message. I also sent an email to the email address in your profile - but no reply as yet - is that email address up to date? Look forward to contact...

Tony Think I am barking up the wrong tree here, and have misled you. I have just had another go at analysis and decided to start from scratch ie what works and what doesnt to establish a clear picture. AND I can report that i DO have the same issue on CH and DHW. On demand, the boiler...

OK Tony Ill be back in touch. Steve

Tony I have not had a chance to remove and clean, but have managed to measure flow return temps, albeit with a digital cooking thermometer clamped to flow and returns whilst hot tap open for 5 mins or so. The readings I got were about 65c flow and about 40c return (measured at outlet...

Well Tony After expriencing a 'senior moment' (which lasted a few days...) I can report back on the differential between flow and return. I was previously puzzling how to get at flow and return on the plate until finally realizing that the flow and return from bolier and above pump are...

Tony ( and spectators !) Have had a go at a few things you mention. Simple one first - subbed 10K for sensor and symptoms the same - suggesting the DHW probe is actually ok. Reconnected. Unsure which are the flow/return pipes in order to identify differential. Boiler is in tight...

Thanks Tony Bit of homework - will do over next few days and report back. Best Wishes Steve

Tony - wow what a fast response (as usual) It doesn't affect the CH at all - thats great, just DHW. Re the cycle, yes I agree as it is only six seconds theres no real detection of water temp change at tap. I do have to say that I am sure when this started, the cycle was longer than 6 seconds...

HI all Sorry for delay in replying but wanted to get into the throes of Summer before taking the boiler down. My last reply was in response to Tony Agile who agreed that it did indeed look like it was the plate heat exchanger that was blocked causing the on/off cycle of burner during hot...

To confirm. 24 hours no drips from PRV, so that sorted. Stilll getting fluctuations in DHW temp, but less so when DHW temp control reduced. Going away for a few days so will remove DHW HE on return and clean/replace. Incidentally I am based in the NW with quite soft water, do the HE's...

Tony - UPDATE Two items appear un-related, I have had a go at the PRV (on/off/on/off etc) and the dripping has stopped. Also it is a 428s not 424s, but dont think that unduly affects diagnosis, just a different DHW HE if I need to replace. Steve

Tony Problem getting to flow return pipes on DHW HE, need to try again from below. But I do have another symptom. My overflow is dripping - Pressure had dropped so low and I just had to 'pressure up' in order to get boiler to fire up again. Does this fit with the blocked DHW HE diagnosis...

Hi Tony. Pleased you are still about. Ill give it a go - sounds good. I have no issues with a boiler replacement, this owes me nothing after nearly 10 years, but I actually like it. It has been a good and faithful servant !! Steve

HI again all. I have had some great support from this site in the past so here's hoping all the good guys are still around (Tony Agile etc !!) MY thermo shower (Grohe) has recently been delivering varying temperature HW, going from hot to cold and back within seconds. At first suspected...

Tony just an update Did full drain, flush and refill with new inhibitor over summer. Pressured up to 'red light' and it has stayed there for at least 6 weeks now. Regards SjH

Tony Thankx Steve