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The cylinder is set between 50-55 C. The 637 was fitted in 2019. D19 is the pump operating mode and is set to 2 - stage pump - auto. Setting it to 3 sets operating mode always to stage pump. What does always setting to stage pump (3) do versus auto (2)?

Thanks - extending the pump over-run slightly was exactly what I ended up doing to avoid sitting in anti-cycling. The pump over run is set at 7 mins. D.0 is set at 15KW and everything works well now. Only thing I'm trying to understand is why once target flow temperature is reached...

Reduced power to 13KW and anticycling has disappeared. Radiators working well. Have a more general question about boiler cycling. If the weather outside is really cold (say -30C) and my house has lots of heat loss, the boiler will have constant demand for heat. Does that mean that if the...

Power reduced to 15kw and still getting anti-cycling for a few minutes at the end of each cycle. Should I reduce power further?

thanks for your help

60c

You are right - I don't use the radiators all the time particularly with insulation being so good in some rooms that some radiators not switched on next day. I will take heating load down to 15KW. I also saw a max anticycling time of 20 mins (default setting). Should I leave that alone? I saw a...

Should I leave heating set up as it is or should I make any adjustments?

I have 15 radiators and the floor area of the house about 1800 square feet. Had the boiler changed about 2 years ago. Added an extension with two extra radiators and the boiler went from 28KW and 37KW. Installer insisted it was justified although I do agree with you that it is oversized as I...

Boiler goes into anti-cycling mode for a few minutes at the end of each cycle after pump over-run. Does anyone know if it's normal or whether I need to make adjustments to my heating set up

Looking at other posts online it seems the 637 ecotec is a powerful boiler that does have problems losing the extra heat. The banging when boiler is in pump overrun seems to be loudest in the two radiators without TRVs ( bathroom and hallway). I've lowered the power setting of the boiler to...

Are there any settings in the boiler that need to be looked at?

Thanks Harry Bloomfield - so I assume heat is lost through the radiators. Mottie - how do I check if the auto by-pass is set up correctly?

I have a Vaillant Ecotec plus 637 boiler fitted 2 years. I also went from a vented to unvented hotwater system and had underfloor heating fitted in a converted garage. I understand the pump overrun is supposed to protect the boiler heat exchanger from damage but where does the heat go? Reason I...

Thanks for your help - will leave setting at 55C

I'm trying to figure out the best target flow setting for my Vaillant Ecotec plus 637 boiler. What is the acceptable range? It's been set at 55C right now - return is around 40C

not sure how to check that - I do know pressure is around 1bar when cold (30C) to about 1.8 bar at 75C

thank you - sometimes when the water temperature drops my radiators start banging - is that normal?

I have an ecotec plus 637 boiler. I have a question - when the boiler starts ( heating mode 'burner on' when I look at the status) why does the temperature drop first before going up? Is that normal?

Apologies for not being clearer - I'm trying to figure this out as I go along By boiler cycling I mean the boiler goes through the usual checks before the burner goes on then the temperature reading on the boiler (flow temperature) goes up. After a several minutes the burner switches off and...