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lukewarmbath
@lukewarmbath
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Joined: Nov 14, 2025
Last seen: Nov 19, 2025
Topics: 1 / Replies: 5
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RE: Ecodan ASHP Low COP and Unstable Compressor Frequency

Just to clarify, returning water from UFH is colder than returning water from radiators. Just checked with a infrared thermometer and approximate temp...

2 weeks ago
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RE: Ecodan ASHP Low COP and Unstable Compressor Frequency

Don't know the house heat loss unfortunately. Downstairs UFH: 5 loops (downstairs dimensions approx size 8m x 9m) Upstairs Radiators: 6 total ...

3 weeks ago
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RE: Ecodan ASHP Low COP and Unstable Compressor Frequency

@davidnolan22 Thanks for the graph. That's really useful! Agreed, these temps are too high but behavior is similarly chaotic at lower flow temps....

3 weeks ago
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RE: Ecodan ASHP Low COP and Unstable Compressor Frequency

yup, it is definitely over working. You can hear the compressor running hard continuously when getting up to temperature after a stop or setback, then...

3 weeks ago
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RE: Ecodan ASHP Low COP and Unstable Compressor Frequency

Thanks for the reply and the welcome !   Located in Inverness (Scotland) Heatpump has been running in weather compensation mode for the las...

3 weeks ago
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