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Code Error Corrective Action E003 HP outlet temperature thermistor detection error reading < 86°F when compressor has been running for 30 minutes 1. Check if the thermistor is out of the mounting pocket on the water outlet pipe E004 E005 E006 HP discharge over temperature 1 Temp sensor reading of 266°F HP discharge temperature Thermistor detection error 2 HP Discharge temperature thermistor detection error reading < 113°F when compressor has been running for 30 minutes 1. Check & replace the discharge temp thermistor 2. Reconnect the expansion valve PCB connector, check to ensure connection 3. Replace the expansion valve (together with PCB), or the entire heat pump unit 4. Refrigerant flow blocked – replace unit 1. Check if the thermistor is out of the mounting pocket on the water outlet pipe 2. Check if the Expansion Valve Coil or wiring has become disconnected or not connected properly 3. Check resistance on Expansion Valve Coil, should be 46Ω across wires 4. Refrigerant Leak – Check for signs of oil, replace HP 1.Check wiring on the High Pressure switch – check switch continuity 2.Check piping for blockage and/or freeze up preventing flow in or out of the unit 3.Ensure all isolation valves are open & tank is completely filled 4.Check water pump for operation (parameters) ensure power wiring is connected to PCB 5.Check all the air is bled from the heat pump 6.Check if inlet or outlet temp, discharge sensor have fallen out of their wells 7.Check Expansion Valve Coil power connection and Coil Resistance E007 High Pressure Switch Open Refrigerant Pressure > 2000 Psig 27PDF Image | Sanden SANCO2 Heat Pump Water Heater 2017
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