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Our 10 year old Grant heat pump failed

 
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Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 2 hours ago
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JamesPa
 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 4417
07/03/2026 9:38 pm  

Posted by: @mike-patrick
↑

£280 it was better to consider a new ASHP given its age! 

Well thats clearly nonsense.  If a £280 pump failed in a boiler you would replace the pump, as you would in an ASHP.

Posted by: @bobflux
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These systems should work fine without requiring the user to become a part time heat engineer and plumber. Unfortunately, visits from the "tech wizards" are damn expensive, and one tends to lead to another, then another... at some point it becomes profitable to invest the time to learn just enough to debug it on your own.

You can diagnose most of the issues yourself if you have a service manual, access to installer settings, and a forum with people willing to help.

Sadly that's true of many things these days.  The skill of fault diagnosis has become increasingly rare as things have become less repairable.  Cars are just as bad, take a car with a fault into the workshop and basically most of the fitters (I will not dignify when with the title engineer, because mostly they aren't) will plug it into the computer and change parts until the problem goes away, charging the customer each time, without a shred of understanding. 

Posted by: @mike-patrick
↑

Our ASHP has a history and about 5 years ago we did have a new PCB, which cost then about £800.

I had to have a new PCB on a boiler and it cost £500, its probably the most expensive part because its model specific whereas most other parts are generic.  The boiler in question was very simple, I suspect a more modern boiler would have been more.

 

I think @bobflux has summed up the way to approach this in his post above here

 


This post was modified 2 hours ago by JamesPa

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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