Julian S

Good advice - thank you.

Thanks for your reply, JohnMo. Yes, we were running the heating for 3 hrs 4am to 7am to warm the UFH to take advantage of the cheap Cosy tariff (very well insulated house), but I agree that probably not best practice for the HP when it's very cold. It's weird that there wasn't an error on the controller though. Are you saying that the heatpump should have a crankcase heater and it might not be working, or that I should consider fitting one? Thanks again.

Has anyone ever come across the compressor in a Samsung ASHP turning itself off during cold weather? This happened to me last winter when our 12kW Samsung (model AE120RXYDEG/EU) system ended up pushing ice-cold glycol around the house during a cold frosty night (-10C outside). There were no errors on the controller, the heat pump fan was running (couldn't hear the compressor though), all the valves and pumps were working, and the regular freeze-prevention cycle operated during the night as normal prior to programmed heating start from 4am to 7am (Cosy Octopus tariff) – so it seemed to me that the compressor had stopped for some reason. Following a suggestion from someone locally, I got the system going again by diverting the glycol through the hot water cylinder (heated using the immersion) and using that to heat up the ASHP again (and it has been fine since). Although my assumption was that the compressor had stopped working, I have not been able to find any information to suggest that cold temperatures can cause that to happen. Can Samsung ASHP compressors really turn themselves off when it's particularly cold outside without causing any error messages on the Samsung controller? If so, under what conditions can this happen? I hope to get a better understanding to that I can take steps to stop it happening again. Many thanks for any help and insights you might have.