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thanks - will test for hydrogen. Still trying to figure out if this issue is connected to banging pipework near other upstairs bath radiator (banging loud in morning when system goes on but some banging when system in pump overrun). No air in this radiator - lowered power of boiler to 15KW to...

Interesting article - looks like adding a deaerating device to the heating system could make sense

Thank you sirocosm and Harry Bloomfield. I have noticed the amount of air released each time is less after 3 weeks so you both might be right. I'm trying to figure out of this issue is related to loud banging in the pipes near my other upstairs bathroom radiator, particularly in the mornings...

Not tested gas for hydrogen. Will try this. Expansion vessel for the hot water is ok but didn't think this was linked to central heating.

Thank you again for you replies. I never had this issue with my previous two boilers and I have lived in this house with the same pipework for almost 25 years. There is a possibility the boiler is the issue. I have just got my guarantee through after two years - plumber forgot to register the...

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?