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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 13, 2025
Profile Activity
Topics: 17 / Replies: 2685
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RE: Solar to power Heat Pump for DHW

This is correct. Inverter limits protect grid and internal wiring. Depends on your tarrif. For me it makes sense to heat dhw at night at 6.7p/kWh...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan Fails to Heat Water despite temperature drop

Looking at those photos I agree with @ashp-bobba. To put it another way it looks like its targeting a DHW temp of 40 not 50, which means that it wil...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: "Condensing" heat pumps?

There are DHW tanks with a built in heat pump that take their intake from the house, the outside world or the loft. Sometimes these are described as ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan Fails to Heat Water despite temperature drop

By manual I meant constant/DHW priority, ie it should reheat once the temperature drops below (target - hysterisis). Are you certain (a) the unit has...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan Fails to Heat Water despite temperature drop

If it heats reliably when triggered from melcloud it points more to a control misconfiguration than to anything physical. Holiday mode, selecting m...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant AroTherm Plus 7kW

If the thermostat is connected to the call for heat terminal on the vaillant or myson then I suspect it's also a call for cool (IE an 'enable'). If y...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Commencing on an ASHP Installation Process

Good luck. Missing rads definitely was a problem for me. The fancoil was supposedly on 3 month delivery (but actually turned up 4 days later!) and t...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan Fails to Heat Water despite temperature drop

Yeah, mine did exactly the same - no error codes. The turn on/off again suggestion was (sensibly) made by my installer before he turned up - might as...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: "Condensing" heat pumps?

Same here as above. Where have you seen this terminology?

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan Fails to Heat Water despite temperature drop

Mine (Vaillant) recently did something very similar, basically heating DHW for a short while after a reset, then giving up. It was accompanied by var...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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