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Compressor attempts start but fails - Nibe Fighter 2005 8kW

 
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Air Source Heat Pumps (ASHPs)
Last Post by skyefarmer 3 weeks ago
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JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 4292
30/01/2026 8:32 am  

@ian21stcent 

I assume you have checked filters which is a common reason for a range of failure symptoms?


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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 skyefarmer
(@skyefarmer)
Eminent Member Member
Joined: 8 months ago
Posts: 8
Topic starter 30/01/2026 9:26 am  

@ian21stcent Hello. I replaced the soft start on mine about 3 years ago. The only indication I had that the soft start had failed was the fault led. I couldn't find an exact replacement, the new unit had better spec. but was a bit taller which caused slight problem. I'm not on Skye right now so can't tell you what replacement was. I will check email. But I think you have same issue.



   
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 skyefarmer
(@skyefarmer)
Eminent Member Member
Joined: 8 months ago
Posts: 8
Topic starter 30/01/2026 9:30 am  

@ian21stcent Email archive is invaluable. I purchased a CSS-25U Emerson Compressor Soft Starter 25A from Kempston Controls



   
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