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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 17, 2025
Profile Activity
Topics: 17 / Replies: 2694
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RE: Ecodan consuming 100kwh per day in new build!!!

Sorry to hear this is not yet fixed but please do keep posting as those here can help. At present its actually very cold at night despite the warm da...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

Sorry to hear this, it shouldn't happen! Did the installers bump up the WC curve again and/or reinstate control by thermostat, undoing all your good...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Help me keep the faith with my air source heat pump installation

Which, if you are right (which you may be), is unfortunate to say the least, because climate change and the catastrophic effects it is certain to have...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Pressure drop Primary circuit

PHE s can fail, I'm not sure what the most common failure mode is. If a plate separating the two circuits failed pressures will presumably equalise, ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

Hitachi is sadly not alone. The OAT sensor should be in the shade and out of any influence from the heat pump itself. only some manufacturers do thi...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Pressure drop Primary circuit

If you have heat exchangers between primary and secondary the two circuits are isolated so a leak in one wont affect the other. So whichever pressure...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

Im not sure what you are monitoring but defrost is normally done by switching off the fan reversing the direction of refrigerant flow so the heat ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Pressure drop Primary circuit

If your ASHP has both a pressure sensor internally and isolation valves and you also have a pressure sensor one on the expansion vessel then you can i...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Are Homeowners Being Silenced Over Faulty Heat Pumps?

I would actually (and reluctantly) challenge the assertion that its fixable (it can probably be improved however). There are rogue traders throughou...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Help me keep the faith with my installation

Agree with @mars. There is also a diagram in the Vaillant installation manual. Careful with condensate - it freezes so you really don't want it runn...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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