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thank you for the replies. iateyoubutler - I put in a new boiler 2 years ago and have been having this issue. Went from vented to unvented and renewed mains pipe into house. Put in 3 new vertical radiators as a part of an extension on the first floor. Plumber originally thought boiler was...

General question to Vaillant engineers - is it possible for the boiler to create air bubbles in a sealed system. Reason I ask is i'm bleeding air from the same radiator every night for the last 2 weeks. It's a new vertical radiator on the floor directly above boiler. Wondering if installing...

Ticking and clicking is what I would normally expect - had it with last system but was not a big deal. My issue is definitely banging - it's so loud in the morning have to switch offending radiator off. Still hear some banging but not so bad. Will try placing screwdriver against valve when I...

Madrab - All the TRVs are bi-directional- was first thing I checked Mottie - Spirovent deaerator does look interesting

Thank you for your reply. Yes has thermostatic valves. I have already tried that but made no difference.

Before I ask my question some background on my heating system. Installed Vaillant 637 Ecotec boiler two years ago when I had my garage converted into a room. Had underfloor heating installed into garage and a new vertical radiator installed in room above. Went from a vented to unvented system...

Set D.14 to 100% and the temperature difference is 5C after 5 mins. Goes into pump over run after about 5 mins in burner mode. Room thermostat has been reached and been steady for several hours

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?