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JamesPa
JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: May 19, 2026
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Topics: 24 / Replies: 4849
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RE: Flow rate discrepancy between ASHP and manifold

Hmm. What do sensors do if you close 1 or 2 loops down. Does that give a clue. Tbh, apart from faulty sensor, I can't see what this is. Maybe othe...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Flow rate discrepancy between ASHP and manifold

Have you got a buffer tank, low loss header or plate heat exchanger between ashp and manifold? If so there could genuinely be different flow rates!

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Owners

. It does but, unless there has been a firmware update, it cant be a controller fault, suggesting its a wiring, connection or valve fault. But that...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Owners

  OK. The interesting thing is that the heat pump is still in DHW mode, which presumably means that the controller thinks the job isnt finishe...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Owners

OK, how do you know its reached the set temperature, and does it continue to heat the DHW at an elevated flow temp (and thus overshoots the DHW set te...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

Its not so much challenging as seeking to understand. Your house cools very slowly so provided that the right amount of energy is put in over several...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Help…my Nibe has faulted again.

Have you actually had a Nibe engineer in or just an installer. You probably shouldnt be paying anything if Google is right, it should be a warranty i...

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

If the house is heating up I wouldn't worry about low deltaT. Lower is more efficient, at least up to the point where the power consumption of the wa...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Owners

Understood. Nevertheless this is, with high probability, a very simple and easily pinpointed fault that very likely doesn't require any hitachi speci...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Confused by Flow Rates

@toodles Firmware updates? - do Daikin do that

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help…my Nibe has faulted again.

There isnt a short compressor, its that the operating time of the compressor is too short. According to google it may be due to low refrigerant level...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old Hitachi Yutaki ASHP

Yes this makes sense. Ideally you match flow either side of the buffer, at which point it is pointless (but that is anyway the case). Since a perfec...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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