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[Solved] Vaillant aroTherm not heating with many faults

 
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Air Source Heat Pumps (ASHPs)
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 Anon67
(@anon67)
Active Member Member
Joined: 3 months ago
Posts: 6
Topic starter 16/01/2026 11:59 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 3 months ago by Anon67

   
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 ASHP-BOBBA
(@ashp-bobba)
Honorable Member Member Professional Installer
Joined: 1 year ago
Posts: 440
16/01/2026 12:04 pm  

@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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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4516
16/01/2026 11:24 pm  

@anon67, glad to hear they’ve found the issue and that it’ll be replaced. Hopefully that goes smoothly. Will Vaillant be doing the replacing themselves?


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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 4 years ago
Posts: 1759
17/01/2026 1:05 pm  

The mark of a good company to deal with is less to do with them not having issues as much as how they deal with them when they arise. Glad you’re on the way to a quick resolution and props to Vaillant so far for playing fair.


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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