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Error Codes Outdoor Unit Self Diagnosis The outdoor unit has a built-in self-diagnostic system that will register 82 different faults based on the sensors and control logic of the outdoor unit. The setting panel on the unit will display the numerical value of the error code with a red light. All of the error codes are listed in the Installation and Owners Manuals provided with the unit- and cause the heat pump to shut down simultaneously. Inadequate Flow Restricted water flow to and from the heat pump will ultimately result in an error code. If this issue arises, make sure the pipe size is correct, the pipe length/lift is inside the maximum, check the heat pump piping for blockage or kinking, look for freezing if in a cold climate, ensure all water shut off valves are open, and ensure water is supplied to the system from the building. System Communication A system control error show up occasionally on a heat pump unit. For a communication/system control error - Error Code 40 to 82 – perform the following checks: - Check that all wire connections are firmly attached to the PCB. - Check the unit for proper voltage at various points. Clearing Errors To clear an error code after it has been corrected, turn off power to the unit and wait 3 minutes before restarting. The error code will now be accessible in the Error History mode. 24PDF Image | Sanden SANCO2 Heat Pump Water Heater 2017
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