Useful Tip: There's a small printed circuit relay unit on the PCB inside the unit. Contacts weld. Replacement from Maplin possible. Part Ref N28AW - 24v coil voltage with 10 amp/240V a.c. relay contact. Compare both unit bases and remove the additional relay leg (pin conection) before soldering the replacement into the PCB. Characteristic is the coils ice up because the relay contacts are welded in the ON position so the compressor continously runs.