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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jan 13, 2026
Profile Activity
Topics: 20 / Replies: 3926
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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...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

1 month 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...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Confused by Flow Rates

@toodles Firmware updates? - do Daikin do that

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

1 month 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...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Electricity price predictions

Judging by the representatives I have spoken to locally, they represent more or less whatever you want them to represent provided you don't try to dis...

2 months ago
Forum
Electricity, Tariffs, Monitoring & Providers
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RE: Hitachi Yutaki SCombi Heat Pump - Owners

Check on the heat pump controller. It will show whether the heat pump thinks its in DHW or space heating mode. If it thinks its in the desired mode ...

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

What does the controller show - does it show that its in heating mode or does it show its in dhw mode? It could just be a stuck valve/faulty conectio...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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