Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Vaillant aroTherm n...
 
Notifications
Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

[Solved] Vaillant aroTherm not heating with many faults

 
Page 2 / 2
Air Source Heat Pumps (ASHPs)
16 Posts
5 Users
14 Reactions
3,186 Views
RSS
 Anon67
(@anon67)
Active Member Member
Joined: 7 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 6 months ago by Anon67

   
👍
2
ReplyQuote
 ASHP-BOBBA
(@ashp-bobba)
Prominent Member Member Professional+
Joined: 2 years ago
Posts: 491
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.


   
👍
2
ReplyQuote
Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4769
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?


New to heat pumps? Take the Heat Pump Fundamentals course and use INTRO50 at checkout for 50% off.
Rewritten and updated for 2027
📘 From Zero to Heat Pump Hero
🛠️ Bodge Buster
🎧 Prefer to listen? Heat Pumps Explained – use AUDIO50 at checkout for 50% off.


   
ReplyQuote
Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 5 years ago
Posts: 2010
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"


   
👍
2
ReplyQuote
Page 2 / 2
Forum Jump:
  Previous Topic
Next Topic  
Share:

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Click to access the login or register cheese
Protected By
Shield Security PRO