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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Nov 6, 2025
Profile Activity
Topics: 18 / Replies: 3300
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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, ...

7 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...

7 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...

7 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 ...

7 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...

7 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...

7 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...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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?

7 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!

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

Just checked mine. 543 starts from mid November to now. So, generously, 1000 per year unless I use if for cooling in summer. 20 years seems a reaso...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: What happens when the outside temperature exceeds the upper WC point?

@judith Thanks, Ill give it a go. Given the tight hysteresis do you turn up the target temperature a bit to ensure it switches back on early enough ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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