Fault Code Troubleshooting Guide

ohms indicates good; high resistance indicates the switch is defective and should be replaced.

Heat Pump High Temperature Fault (Compressor discharge temperature is too high):

The refrigerant system may be blocked-

•Check the heat pump piping and evaporator; if the tubing or evaporator is covered with frost in one spot, this indicates there is a restriction in the system at that point. Call technical services for assistance.

Check the condition of the compressor-

•See the “Compressor Check Flowchart” (p.28). Water temperature is too high-

•The control board is not controling the tank temperature properly

•Check the upper and lower tank thermisitors; make sure they are in contact with the tank wall.

•Check the tank temperature sensors, see “Temperature Sensors” (p.32).

Main Control Board Crystal Fault (Main board failure):

Faulty control board-

•Replace the control board.

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

Main Control Board RAM Fault (Main board failure):

Faulty control board-

•Replace the control board.

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

Main Control Board ROM Fault (Main board failure):

Faulty control board-

•Replace the control board.

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

Main Control Board EEPROM Fault (Main board failure):

Faulty control board-

•Replace the control board.

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

Main Control Board State Fault (Main board failure):

Faulty control board-

•Replace the control board.

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

Low Supply Voltage Fault (Low input voltage):

Power supply voltage is too low-

•Verify the unit is connected to 240 VAC. Heat pump operating voltage range is 204-264 VAC. The compressor will not operate below 204 VAC, but the heating elements will.

•If connected to 208 VAC, a buck-boost tramsformer is required to boost to 240 VAC.

High Supply Voltage Fault (High input voltage):

Power supply voltage is too high-

•Verify the unit is connected to 240 VAC, unit is intended for 240 VAC connection only. If connected to higher voltage, a buck boost transformer may be required to reduce voltage. Heat pump operating voltage range is 204-264 VAC. The compressor will not operate above 264 VAC, but the heating elements will.

•If connected to 208 VAC, a buck-boost transformer is required to boost to 240 VAC.

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American Water Heater HPE10280H045DV, HPE10260H045DV manual Main Control Board Crystal Fault Main board failure
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