New central heating system and boiler vibrating.

[jimbo28]

Hi, i have recently installed a new central heating system which consists of 6 rads and a vaillant ecotec pro 24 combi boiler. All seemed to be working ok for a week until a loud vibration sound was heard from the boiler. It seems to happen intermittently after the heating has been on for a couple of hours. I assumed that the vibration occurs when the TRVs are closing, so i adjusted the automatic bypass valve. I also adjusted the lockkshield valves on the rads but the vibration is still happening. I have called vaillant helpdesk and they said it could be dirt in the system. I have flushed system through but no joy. Any ideas thanks?

 

[gas4you]

If it occurs when the boiler is running at full power, then the HE coils are full of sludge.

Didn't your installer flush it thoroughly? What does he say about it?

 

[jimbo28]

Hi, im sure the installer did flush it thoroughly. He is out of the country at the moment (luckily for him) so i was looking for a solution. When the vibration occurs if i open a couple of trvs it cures it for some time. All the trvs are bi directional. Do you still think t is sludge? Thanks for your reply.

 

[spraggo]

Hi jimbo
The automatic bypass? is either blocked or the valve is faulty or is not fitted properly, ie, between the pump outlet (before any MV`s and the return).

Cheers

spraggo.