- Joined
- 15 Feb 2021
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- 55
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We had a new Vaillant EcoTec Plus 612 system boiler installed in February.
Occasionally, about once per week, we have experienced a very loud droning resonance in the pipework. This is savage enough to be heard through the house and felt on the pipes and boiler casing.
It appears to be caused by the water flow shortly after the system fires up and usually stops after a couple of minutes. It is bad enough that my reaction is switch the boiler off instantly. On restarting the noise does not start again.
The boiler was a direct replacement (no changes to plumbing) for a 10 year old similar boiler which developed a leak in its heat exchanger.
Our unvented system has 8 underfloor heating loops and a Gledhill water storage tank on S-plan.
Vaillant’s warranty engineer could find no fault. It did not “perform” while he was here, though it made a loud humming for some minutes as it warmed up – sufficient for him to decide there was something wrong somewhere.
It is difficult to localise the fault because everything is very close together. I cannot be sure which valve is open when this happens though I’m fairly certain that on one occasion the tank circuit was open.
Could one of the Honeywell 2 port valves be causing this?
Does anyone have any other suggestions as to a cause?
Occasionally, about once per week, we have experienced a very loud droning resonance in the pipework. This is savage enough to be heard through the house and felt on the pipes and boiler casing.
It appears to be caused by the water flow shortly after the system fires up and usually stops after a couple of minutes. It is bad enough that my reaction is switch the boiler off instantly. On restarting the noise does not start again.
The boiler was a direct replacement (no changes to plumbing) for a 10 year old similar boiler which developed a leak in its heat exchanger.
Our unvented system has 8 underfloor heating loops and a Gledhill water storage tank on S-plan.
Vaillant’s warranty engineer could find no fault. It did not “perform” while he was here, though it made a loud humming for some minutes as it warmed up – sufficient for him to decide there was something wrong somewhere.
It is difficult to localise the fault because everything is very close together. I cannot be sure which valve is open when this happens though I’m fairly certain that on one occasion the tank circuit was open.
Could one of the Honeywell 2 port valves be causing this?
Does anyone have any other suggestions as to a cause?