kingspan Kingspan ASHP fault 22

[MarcusW]

Hi All

Kingspan Aeromax ASHP fault 22

Looking for any thoughts on A Kingspan Aeromax ASHP 

Recently had a call to look at one which was tripping the main mcb, which was identified as the inverter board eventually got to speak with Carrier and sourced a replacement inverter, this was fitted which aliminated the initial fault. 

However I now have a alarm 22 temp sensors, I have checked these both where reading the same including the cables back to the control pcb. 

I have a nagging memory from looking at one of these years ago the water temperature needs to be above a minimum value, I am failing to get any assistance from Carrier tech possibly down to the COVID restrictions etc. 

I don’t have a back up heater to boost the temperature unfortunately. 

If anyone has any experience of these units that can assist I and the home owner would be very great full. 

Marcus