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Interpreting MelPump data / cycling?

 
Air Source Heat Pumps (ASHPs)
Last Post by Boodgie 4 hours ago
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 Boodgie
(@boodgie)
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Joined: 4 hours ago
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Topic starter 07/03/2026 10:30 am  

Hello All.

Our heat pump was installed in 2022 and I've spent this winter really trying to dial in the weather compensation settings to improve performance. I've had the MelPump app for a couple of weeks and am trying to understand what I'm seeing in the data. 

I'm puzzled about the compressor frequency dropping to zero and immediately bouncing back up. Am I right in thinking this is short cycling? At worst it's every 10 to 15 mins. Thinking about compressor life / efficiency I don't think this is ideal? For context the COP during this 24hrs was 5.3 (using external metering - MelPump says 7.42!).

A bit of info about the system: It's an Ecodan 8.5KW heating a 170sqm house with UFH throughout. I've learned the UFH probably has too many controls - there are three manifolds each with a temp control valve, circulation pump and multiple zones operated by automatic actuators. I've opened the system as much as possible - all the temp control valves are fully open and one manifold runs 24/7 without any external control. The other two have digital room stats to prevent overheating. 

I'd be grateful for any thoughts on the report and advice to improve cost / efficiency.

https://melpump.com/public-report/view/019cc7f6-4657-7cfe-981c-ae2288e0456e

Screenshot 2026 03 07 at 10.03.09

This topic was modified 3 hours ago by Boodgie

   
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