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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 15, 2025
Profile Activity
Topics: 16 / Replies: 2621
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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...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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, ...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

3 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 ...

3 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...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Air source heat pump roll call – what heat pump brand and model do you have?

I'm surprised by this. Is it 2 port or 4 port?

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How many compressor starts per year

My fridge and freezer seems to do at least one per hour, 8000 per year. Just saying!

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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