Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Air source heat pum...
 
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!

Air source heat pump circuit not operational

 
Air Source Heat Pumps (ASHPs)
Last Post by Mars 5 months ago
2 Posts
2 Users
1 Reactions
585 Views
RSS
 Plummersknowe
(@plummersknowe)
Active Member Member
Joined: 7 months ago
Posts: 6
Topic starter 05/01/2026 9:07 pm   [#2711]

Hi - need some advice about one circuit on my heating system - it’s an air source heat pump which is working correctly heating every circuit except for one which despite reprogramming and resetting the wireless thermostat it is failing to accept heat. The  Neostat V2 is indicating it has a wireless connection to the Heatmiser hub and has the flame icon showing that it is responding to the low temperature - room is now at external ambient temperature. Thinking it may be an airlock - anyone able to diagnose & advise on how to resolve. Many thanks



   
Quote
Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4686
06/01/2026 11:08 pm  

Welcome to the forums.

If the thermostat shows it’s calling for heat but that circuit isn’t warming up, an airlock could definitely be the culprit, especially if the rest of the system is working fine. Bleeding the radiators or the circuit to remove trapped air is a good first step. That’s easier said than done (from our recent experience) unless you have a flush and fill valve installed.

Also, check that the motorised valve or zone valve for that circuit is actually opening properly. A couple of years ago the motor on our Honeywell valve leading to the UFH was fried. If it’s stuck or faulty, heat won’t flow even if the thermostat signals for it. If you’re comfortable, try manually operating the valve to see if it moves. Otherwise, a heating engineer can help diagnose and fix valve or circulation issues.


Get a copy of The Ultimate Guide to Heat Pumps

Subscribe and follow our YouTube channel!


   
👍
1
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  
Share:

Join Us!

Directory

Latest Posts

Members Online

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