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H6 Compressor revolution error - Check the supply voltage. - Measure resistance of each thermistors. - Measure resistance of coil of expansion valve to check open or short circuit. - Replace the PCB or heat pump. U0 Refrigerant leakage error - Measure resistance of each thermistors. - Measure resistance of coil of expansion valve to check open or short circuit. - Replace the main PCB or heat pump. E1 Main PCB error - Replace the main PCB. - Replace the control PCB. - Check the installation location. - Check the supply voltage. - Replace the main PCB or heat pump. - Replace the main PCB. E2 L7 Control PCB error F5 Communication error between main PCB to control PCB - Check the communication connector on the main PCB and control PCB. - Replace the main PCB or control PCB. E8 High inlet current error H8 Current error L4 High temperature of module error - Check the installation location. - Remove foreign objects from the evaporator coil (e.g. fallen leaves, grass, snow) - Check the Fan motor is not flowing by dirt. - Replace the main PCB or fan motor. L5 High outlet current error - Measure resistance of the discharged thermistor. - Measure resistance of coil of expansion valve to check open or short circuit. - Replace the main PCB or heat pump. P4 Module temperature thermistor error U2 High voltage error - Replace the main PCB. - Check the supply voltage. HJ Water circuit error - Check the inlet water valve. - Check for any piping bend, blocking, kink or frozen. - Measure resistance of each Thermistor. - Measure resistance of coil of expansion valve to check open or short circuit. - Replace the main PCB or heat pump. EC High water outlet error - Check the water circuit is not flowing by air, dirt or scaling. - If the water circulation pump is not working, replace the pump. - Measure resistance of water outlet(outgoing) thermistor. - Replace the main PCB. Sanden Heat Pump – Installation Manual SANCO2 Heat Pump – Installation Manual Page 19 of 32 Page 27 of 44PDF Image | SANCO2 Heat Pump Water Heater R744
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