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View the thread, titled "Vaillant boiler vibrating cold start" which is posted in Boiler Advice Forum on UK Plumbers Forums.
Are you the homeowner?
My daughter is.
Whose replaced the parts you?
No. gas engineer neighbour. He seems puzzled by the noise. He also serviced the boiler about a month ago and was fine then apart from the kettling. Like I say it runs fine other than the resonance vibration for 10secs or so when first starting up. Don't want to throw much more money at it 14 years old now.
Get the gas engineer to loosen the case mounting hex bolts 1/2 a turn
Thanks for the suggestion. It even makes the noise when he took all the panels off exposing the heat exchanger. Does he need to service it again now that he's replaced the flue collector and heat exchanger? Could the gas mixture have changed?
He should of checked it
I suspect the bolts are tight vaillant did a tb a few years ago saying you need to loosen then and install copper grease due to problems with noise I’m guess as it was second hand it didn’t come with this information
I suspect the bolts are tight vaillant did a tb a few years ago saying you need to loosen then and install copper grease due to problems with noise I’m guess as it was second hand it didn’t come with this information
Heat exchanger mounting bolts
Great thanks I'll pass that on. Do you have the tb reference that I can give him. I'm tempted to get someone else in to do a service and check the mix.
Sorry I don’t but @king of pipes @ChrisB1982 might
D
Deleted member 120897
No, I don’t sorry. If not KOP then @EvilDrPorkChop might?
No sorry I don't either.
Unable to track down the tb but have had a response from vaillant. The grease is to stop creaking and clicking noise which isn't the problem but the spec for tightening the nuts is only 6nm which I guess he overtightened with the water pump pliers he used. I noticed he also didn't replace the nuts with the new ones supplied with the flue collector. Not sure if that's important enough to get him to change when he loosens them.
Many thanks for your help. I'll post the outcome.
Many thanks for your help. I'll post the outcome.
Boiler now much quieter. Plumber loosened heat exchanger clamps slightly which helped but richening the gas mixture from 8.1% to the specified 9.1% seems to have resolved it many thanks to shauncorbs for his advice
Boiler now much quieter. Plumber loosened heat exchanger clamps slightly which helped but richening the gas mixture from 8.1% to the specified 9.1% co2 seems to have resolved it. Many thanks for your advice
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