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JamesPa
@jamespa
Moderator
Illustrious Member
12007 kWhs
contributor
Joined: Apr 3, 2023
Last seen: Apr 7, 2025
Topics: 14 / Replies: 2239
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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 hours ago
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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...

5 hours ago
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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...

6 hours ago
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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 ...

8 hours ago
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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...

9 hours ago
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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...

19 hours ago
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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...

2 days ago
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RE: How many compressor starts per year

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

2 days ago
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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...

3 days ago
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