Hi - I have a NIBE F2040 12kw and SMO20 and have been having short cycling, high temp & high pressure alarms and defrosting issues (unfortunately from installation back in 2022). My heat pump uses a NIBE weather compensation curve. It provides space heating and hot water. We’re in a 4 bed late 1980s…

Hi Katherine, I’m a (happy) NIBE owner but my installation is not especially useful for comparison with yours since mine is a Ground Source system (so no defrosting) in a more modern and very highly insulated house. My heat pump used 11.8 kWh of electricity on 11th Jan. 83 kWh is a lot of electric…

Hi David - thanks for the reply - as far as I understand my system doesn’t have a back up heater. We do have an immersion heater in the hot water tank. (You kindly had a look at some short cycling data off my system from Uplink a while back).

Just for reference on the 11th my 8kW Samsung running 24/7 used just over 50kWh. (4 bed detached house)

Hi Katherine Welcome back, I recall we conversed about your strange DHW behaviour. Did you ever sort that? My 16kw smo40 controlled F2040 used 56kwh on the 11th January and did a whole load of defrost cycles through the day Coupled with the heat from the log burner, It does sound excessive for y…

Hi Sam @etchelsa - many thanks for the reply - unfortunately not much has happened to sort the problems since eI last posted. The DHW problem remains, and the recent cold damp weather has highlighted the short cycling issues with the heating system as well. Very interesting that your system althoug…

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NIBE F2040 12kW is short cycling

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