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Sim0n0
@sim0n0
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Joined: Nov 26, 2025
Last seen: Jan 12, 2026
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Topics: 0 / Replies: 26
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

It’s a long time since I’ve looked at the manual but I thought I remember Thermo off just controlling any secondary circulation pumps? I’ve spent hu...

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

@jamespa It has always worked with these settings and nothing has been changed which points to a fault somewhere. I haven’t done any troubleshooting y...

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

@jamespa I know it’s reached the set point as the set temp and the actual temp are both showing 48 degrees. Usually this would trigger the switch back...

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

@jamespa Hi James The controller shows it’s still in DHW mode despite reaching the set temperature. It’s not on a timed program, it turns on at 45 and...

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

@jamespa My experience is that local 'old school' plumbers/heating engineers tend to be older and don't want the hassle of getting involved in poorly ...

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

@jamespa I guess it could be a faulty connection. The original installers fitted all the cables so badly that the mental case wouldn't fit. It's sat o...

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

@jamespa I honestly do appreciate you trying to help but it's nothing obvious. It's in DHW mode which is set to 48 degrees - temp gets up to 48 but it...

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

@editor Big ad on this site advertising £7500 saving on a heat pump. NOT if that £7500 went to the developer! As the first owner of our property, I wa...

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

@editor Just seen your book 'Bodge Busters' with a forward by Graham Hendra. Graham Hendra formerly of Freedom Heat Pumps who supplied the Hitachi sys...

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

@jamespa Latest issue is the system getting 'stuck' in hot water mode and not switching back to heating. The motorised valve can be operated manually.

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

@editor So many pro heat pump evangelists on the internet, but the reality, at least local to me in Buckinghamshire, is an industry full of charlatans...

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

@trebor12345 Sorry, the forum won't let me message you until I have more replies

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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