Diagnostic Codes - American Water Heater Hybrid Electric Heat Pump Water Heater Manual

DIAGNOSTIC CODES

DISPLAY SHOWS
UPPER ELEMENT
CONNECT
FAULT
LOWER ELEMENT
CONNECT
FAULT
HEAT PUMP
CONNECT
FAULT
FAN
CONNECT
FAULT
AMBIENT TEMP
SENSOR SHORT OR OPEN
OR AD ERROR
UPPER TEMP
SENSOR SHORT OR OPEN
OR AD ERROR
LOWER TEMP
SENSOR SHORT OR OPEN
OR AD ERROR
DISCHARGE TEMP
SENSOR SHORT OR OPEN
OR AD ERROR
COIL TEMP
SENSOR FAULT
OR AD ERROR
MAIN CIRCUIT BOARD
FAULT
HIGH TEMP
LOCKOUT
CONDENSATE
DRAIN
ALARM
(If Accessory Condensate
Pump is Installed)
NOTE: The diagnostic codes listed above are the most common. If a diagnostic code not listed above is displayed,
contact Residential Technical Assistance referencing the number on the front of this manual.
16
INDICATES
1. Upper element is not functioning
1. Lower element is not functioning
1. Heat Pump compressor is not
functioning.
1. Heat Pump fan is not functioning.
1. Ambient Temperature Sensor is not
functioning.
1. Upper Temperature Sensor is not
functioning.
1. Lower Temperature Sensor is not
functioning.
1. Discharge Temperature Sensor is not
functioning.
1. Coil Temperature Sensor is not
functioning.
1. Main Circuit Board is not functioning.
1. Water temperature in unit has
exceeded 190° F.
1. Condensate pump failure.
CORRECTIVE ACTION
1. Turn off power at the circuit breaker/fuse
box and check for a loose connection at the
element. For access directions see "Heating
Element Replacement" section. If error persists
proceed to the next step.
2. Replace non-functioning element. See "Heating
Element Replacement" section.
1. Turn off power at the circuit breaker/fuse
box and check for a loose connection at the
element. For access directions see "Heating
Element Replacement" section. If error persists
proceed to the next step.
2. Replace non-functioning
Element Replacement" section.
Using an element greater
IMPORTANT:
than 2000 watts in place of the lower element
will damage the water heater and void the
warranty.
1. Contact a qualified person to service the heat
pump.
1. Contact a qualified person to service the unit.
1. Contact a qualified person to service the unit.
1. Contact a qualified person to service the unit.
1. Contact a qualified person to service the unit.
1. Contact a qualified person to service the unit.
1. Contact a qualified person to service the unit.
1. Contact a qualified person to service the unit.
1. See "Safety Shut-off" section.
1. Check to see if accessory condensate pump is
plugged in and has power. Also check circuit
breaker/fuse box and GFCI (if used). if error
persists proceed to the next step.
2. Check condensate pump outlet tube for
blockage. if error persists proceed to the next
step.
3. Check control wire connections to condensate
pump. If error persists proceed to the next step.
4. Replace accessory condensate pump. If error
persists contact a Qualified Person.
element. See "Heating