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Last seen: Sep 18, 2026
Hitachi Yutaki SCombi Heat Pump(Indoor Unit ) RWD-3.0RW1E-220S-K(Outdoor Unit) RAS-3WHVRP1 2024 build bungalow200m2High level of insulationUnderfloo...
@robs On the 5. 10kW Viessmann Vitocal in Sheffield. What is causing the heat pump to turn off and on every hour (approx). It it a room thermostat o...
Thanks for your help.
I have no idea, to me there is no logic. There is no information on-line about this Hitachi system, so a bit of a loss.
The heat generated in the 5 minute period is with the pump on which goes to the manifold and floor. My de-ice cycle is exactly as yours.
In the 5 minute period the compressor is running, taking electrical power and producing heat. This, what Hitachi call a "Thermal Off" I might call a ...
The first dip is the thermal off period where the compressor stops for 3 minutes and the refrigerant in the pipe from the heat pump to the internal un...
The fan does turn off, water from inside is then pumped in reverse, power is take to heat the water and then the fan and compressor runs. Takes about...
@editor I just wanted to know other owners thoughts and experience of this system. I am having issues with short cycles and getting steady flow tempe...
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Degrees of Separation
Latest Posts
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@editor Aargh - Trustpilot. On my journey, Ì contacte...
By L8Again , 2 hours ago
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RE: Cooling with air to water heat pumps
@editor does that mean you have to have two separate ex...
By mrkfm , 12 hours ago
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RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
Posted by: @ian-s Could always use the money saved o...
By Rob of York , 17 hours ago
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RE: Why are ASHP installs so expensive?
And then you look at US electricity prices and weep.
By bornagain , 19 hours ago
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Depends on what controls the pump! Thats the whole poi...
By JamesPa , 24 hours ago
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The positive reviews keep coming in for Britain's Heat ...
By Mars , 2 days ago
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RE: Next steps on my ASHP journey: Radiators and Pipework
I have one of these fitted which also allows you to reg...
By Old_Scientist , 2 days ago
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RE: Recommendations in Ely (Cambs) area for Full setup checks on Nibe HP setup for House.
If they can't don't give up. Heat pumps are, in reali...
By JamesPa , 3 days ago
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RE: Missing flow temperature in Heat Geek proposal
Yes that's what would happen by turning down the lsv to...
By JamesPa , 3 days ago
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RE: Grant R290 DHW Cycle Interuption
It looks like some sort of short pre-run. The question...
By JamesPa , 3 days ago
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RE: Cascade System or larger single unit
@renewables345 I would say if it a new build it’s no mo...
By Aventus Eco , 3 days ago
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RE: Say hello and introduce yourself
@gz00, welcome to the forums. There’s a huge amount of ...
By Mars , 4 days ago
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RE: Home energy storage & battery register
1 fox ess lv5200 batteries, plus 2 more waiting to be i...
By Jimcub , 4 days ago
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RE: Heat Pump deployment statistics: June 2026
@l8again Unfortunately the government is, I suspect,...
By JamesPa , 4 days ago
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