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Code Error Corrective Action High Ambient Defrost Drive – Unit is E008 trying to defrost in an Ambient 1. Check if the Evaporator air flow is blocked or recirculating 2. Check Evaporator Coil for dirt and debris 3. Check Ambient Temperature sensor resistance/connection 4. Check Defrost Temperature resistance /connection 1. Check if the Defrost thermistor has fallen out of its well on the Evaporator coil 2. Check Resistance and Connection of the Defrost thermistor E009 Temperature > 68°F HP Defrost Thermistor detection error not sensing 37°F or less with at least 30 minutes of compressor operation E011 HP Inlet Temp thermistor wire break or reading value = -22°F E012 HP Outlet Temp thermistor wire break or reading value = -22°F E013 HP Discharge temp thermistor wire break or reading value = -24°F E014 HP Defrost thermistor wire break or reading value = -58°F E015 HP Ambient Temp thermistor wire break or reading value = -58°F E016 Tank thermistor wire break or reading value = -22°F E021 HP Inlet Temp thermistor wire break or reading value = 212°F E022 HP Outlet Temp thermistor short circuit or reading value = 302°F E023 HP Discharge thermistor short circuit or reading value = 302°F E024 HP Defrost Temp thermistor short circuit or reading value = 212°F E025 HP Ambient Temp thermistor wire break or reading value = 212°F E026 Tank thermistor short circuit or reading value = 248°F • These codes are all based on the 5 temperature sensors on the unit and tank sensor not giving a value back to the outdoor PCB. • All these sensors are resistance based, so they can be checked with a multimeter and the resistance reading checked vs ambient, water temperature and the parameter value in the PCB. • Apart from the tank thermistor, all other thermistors are provided in a single assembly. 28PDF Image | Sanden SANCO2 Heat Pump Water Heater 2017
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