Dripping sound inside walls after boiler installation

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Dripping sound inside walls after boiler installation

Postby ajr0987 » Tue Dec 05, 2017 1:58 pm

Hi there,

We have just had a new boiler installed (Worcester Bosch Greenstar 18Ri) along with TRVs (Honeywell V117e) on all radiators except one in the living room.

It was installed last Tuesday and since then we have played around with the valves to get a good temperature in the house. We are finding that the upstairs is just not getting that hot, only if you shut off most of the other valves does it get properly hot on a single radiator. Downstairs seems to be working well though.

We have also noticed a horrendous dripping sound (see video from last night: https://youtu.be/sGmTO_7VB9c) which is most prominent in the living room by the radiator with no valve, and the main bedroom upstairs (where the valve is set to just over 3). The noise is constant downstairs while the heating is on, and it comes on when the heating turns on in the morning - it's so loud and annoying that we will be keeping it off in the morning now.

No adjustments were made to any pipework anywhere - we just had the old conventional boiler replaced with this one, a power flush, and 11 TRVs fitted. All radiators were bled, and I also went round and bled them all again twice since then. Very little air came out of a few of them, but mostly water.

The engineer who installed it is going to come back, and is going to undo the lockshields to see if they need adjusting. Does anyone have any other ideas as to what this could be?

The old boiler died, but we never heard this noise at all whilst we had that. It's unbearable!

Thanks
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Dripping sound inside walls after boiler installation

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Re: Dripping sound inside walls after boiler installation

Postby kfordgas » Tue Dec 05, 2017 2:41 pm

Hello and a warm welcome to the forum
When you have trv's fitted to a system it can uncover all sorts of weird noises, usually as the water rushing through pipes is changing as thermostats shut down. It will need careful balancing to try and reduce the noise, also consider having an auto bypass fitted by the pump to reduce the pressure when the TRV's are shutting down. The pump could be turned down, but this is the least preferred option as it can affect the boiler.
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Re: Dripping sound inside walls after boiler installation

Postby ajr0987 » Tue Dec 05, 2017 3:00 pm

Hi, thanks for such a quick reply.

That's helpful to know. In terms of the balancing, how is this done? I presume that is an engineer job?

Re the pump - another engineer fitted us a modulating pump a month or so ago with our old system, which the latest engineer has said was not necessary (as the boiler modulates already). He turned the pump up to full and said see how it goes.

Could this be part of this problem?

Thanks
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Re: Dripping sound inside walls after boiler installation

Postby kfordgas » Tue Dec 05, 2017 3:14 pm

Yes the pump is the issue, modulating pumps don't work that well when left to modulate. Try and turn it down to speed ii, or 2, see if that helps. Balancing may not help in this scenario, you'll just push the noise elsewhere.
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Re: Dripping sound inside walls after boiler installation

Postby ajr0987 » Wed Dec 06, 2017 6:10 pm

Thanks, turning the pump down has helped a lot. We did notice a few hours later that the noise did start again but not as bad as before and it sid stop eventually. Could it be adjusting to the new pump setting?

We are finding it very hard to get the temperature right upstairs. The TRVs are set at different levels and the rads are comng on but then going off while the heating is still set to on.

Downstairs is fine and remains at full temperature the whole time, but you notice the cooler temperature as soon as you get up the stairs. I then end up turning a valve up and the heat comes back instantly. What would you suggest for this?

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