Vaillant boiler vibrating cold start

[jonnyp]

Vaillant ecomax 18e boiler noise at cold start.

Replaced heat exchanger with reconditioned unit and new flue collector as kettling was getting problematic. Works fine except vibrating for around 10 seconds on cold start. Didn't do it before. Any ideas?

 

[jonnyp]

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.

 

[jonnyp]

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.

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

 

[jonnyp]

Very much appreciated. I've messaged them. Fingers crossed.

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