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[Solved] Vaillant aroTherm not heating with many faults

 
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Air Source Heat Pumps (ASHPs)
Last Post by ASHP-BOBBA 1 hour ago
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 Anon67
(@anon67)
Active Member Member
Joined: 6 days ago
Posts: 6
Topic starter 16/01/2026 10:59 am  

Thank you all for your help with trying to get this sorted. Just a quick update to close this thread off incase anyone has similar in the future. 

I phoned Vaillant on Monday, spoke to the tech support line, he said going off the fault codes he suspected it to be low on refrigerant so he booked me an engineer visit. 

Tuesday morning the DHW started faulting displaying similar messages compressor blocked etc

Guy came out late yesterday afternoon, zero pressure in the refrigerant circuit, pressured it up with his test gas, could watch pressure dropping off immediately and could physically hear a leak. Traced to the evaporator, which isn't replaceable or repairable so they are replacing the full unit. 

Hopefully it'll be all sorted by next week. 

 


This post was modified 1 hour ago by Anon67

   
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 ASHP-BOBBA
(@ashp-bobba)
Prominent Member Member Professional Installer
Joined: 1 year ago
Posts: 357
16/01/2026 11:04 am  

@anon67 Pleased they are replacing it for you and I am pleased when I said they are quite good with their warranty they actioned it.

Good luck with the replacement 


AAC Group Ltd covering the Kent Area for design, supply and installation of ASHP systems, service and maintenance, diagnostics and repairs.
Professional installer. Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.


   
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