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Loud noises in the night - and one for the toolbox?

 
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 1 hour ago
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JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 4876
Topic starter 18/05/2026 8:13 am   [#3004]

I was woken at 5am on Sunday to a very loud noise, akin to a football rattle or someone drawing something across a washboard, emanating from somewhere.  After eliminating other sources I turned off the heat pump and the noise went away.  Disinclined to investigate at that time, I went back to sleep, concerned that the compressor or some other major component in the heat pump had failed.

At a more sane hour I investigated.  It was definitely the heating system and it wasn't getting any better.  Some of the pipes were vibrating.  The noise was much louder indoors than out and removing the sides from the heat pump confirmed that neither the compressor nor the water pump was making a loud noise.     At this point I started to fear the need to dismantle internal walls behind which primary pipework had been hidden in order to reveal some unknown point where pipes were touching something that they were not previously touching.  Not a pleasant prospect.

After some more head scratching and consternation I decided to 'shock' the system by turning off the isolation valve behind the heat pump rapidly but momentarily, and then turning it back on again, all while the heat pump was still running.  Problem immediately vanished and so far has not reappeared.

Im guessing that an air lock had developed somewhere in the (necessarily) fairly convoluted primaries and was causing them to vibrate.  'Shocking' the system dislodged the bubble which is hopefully now sitting somewhere innocuous, like at the top of a radiator.

One for the toolbox I think.


This topic was modified 1 hour ago by JamesPa
This topic was modified 1 hour ago by Mars

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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