Fault Code Troubleshooting Guide

connector. Refer to chart #2 (p.33) for expected resistance value. If the measured resistance is >200Ω or =0Ω, the thermisitor is faulty.

•Replace thermisitor assembly. Control board faulty-

•Replace control board.

•If replacing the control board doesn’t resolve the issue, contact technical support.

Coil Temperature Sensor Short or Open or Ad Error (Coil temperature sensor circuit is not functioning):

Loose connection or damaged wire-

•Turn off power at the circuit breaker / fuse box.

•Check that connector CN212 on control board is seated.

•Check wires for damage.

Discharge temperature sensor is shorted or open-

•Unplug ribbon cable from CN212; check resistance between pins 5 and 6 of the ribbon cable connector, refer to chart #1 (p.33) for expected resistance value. If the measured resistance is >40Ω or = 0Ω, the thermisitor is faulty.

•Replace thermisitor assembly.

Control board faulty-

•Replace control board.

•If replacing the control board doesn’t resolve the issue, contact technical support.

Low Water Level Alarm (The tank is not full of water):

Tank is not completely filled with water-

•Ensure that the tank is completely filled and cycle power off and back on to restart dry fire protection. Fault is still present-

•Call tech services.

Heat Pump Low Pressure Fault (Lower pressure switch is open):

Low suction pressure-

•Use a service gage set to check system pressures (high and low sides).

•The low side pressure switch opens if suction pressure drops below 7.3 psi. and will reset (close) when pressure exceeds 21.8 psi; if suction pressure is less 21.8 psi, the low pressure switch is open, preventing the compressor from running.

•Can be caused by poor air flow across the evaporator; make sure the evaporator and air filter are free of dust and dirt build up, see “Cleaning the Air Filter” (p.11) and “Cleaning the Evaporator” (p.35).

•Can be caused by low refrigerant charge or a blockage in the refrigerant system.

Low side pressure checks good-

•Disconnect the wires from the low pressure switch and check.

Heat Pump High Pressure Fault (High pressure switch is open):

High discharge pressure-

•Use a service gage set to check system pressures (high and low sides).

•The high pressure switch opens at 338 psi and resets when pressure drops below 275 psi.; if it is 275 psi or higher then the pressure switch is open, preventing the compressor from running.

•Can be caused by poor air flow across the evaporator; make sure the evaporator and air filter are free of dust and dirt build up, see “Cleaning the Air Filter” (p.11) and “Cleaning the Evaporator” (p.35).

•Can be caused by blockage in the refrigerant system or low water level in tank.

High side pressure is less than 275 psi.-

•Disconnect the wires from the high pressure switch and check resistance across the terminals; 0

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American Water Heater RESIDENTIAL HYBRID ELECTRIC HEAT PUMP WATER HEATER, HPE10280H045DV, HPE10260H045DV manual
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RESIDENTIAL HYBRID ELECTRIC HEAT PUMP WATER HEATER, HPE10260H045DV, HPE10280H045DV specifications

The American Water Heater HPE10280H045DV and HPE10260H045DV are pioneering residential hybrid electric heat pump water heaters designed to deliver energy-efficient performance while meeting the hot water demands of modern households. These innovative units fuse traditional electric heating with advanced heat pump technology, allowing for significant reductions in energy consumption compared to conventional electric water heaters.

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