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TROUBLESHOOTING
20 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide
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.
DIAGNOSTIC CODES
DISPLAY SHOWS INDICATES CORRECTIVE ACTION
“-”,”--”,”---” Unit is doing a system
diagnostic.
Normal operation--no action
ICE Heat pump is in defrosting
cycle.
HPO Ambient temperature
45°F-120°F, average tank
temperature of 59°F or less.
EUC Upper element is not
functioning
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 “Replacing the
Heating Element” section on page 27.
ELC Lower element is not
functioning
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 “Replacing the
Heating Element” section on page 27.
SF The air filter is dirty. 1. Turn off power at the circuit breaker/fuse box.
2. Clean the air filter. See “Air Filter Maintenance” section
on page 30.
ECF The heat pump compressor is
starting/stopping frequently.
1. Turn off power at the circuit breaker/fuse box.
2. Clean the air filter. See “Air Filter Maintenance” section
on page 30.
3. If error persist, please contact a qualified person to
check the fan wire connection.
E20 or E21 Upper Temperature Sensor is
not functioning.
Contact a qualified person to service the unit.
E30 or E31 Lower Temperature Sensor is not
functioning.
E50 or E51 Heat Pump Suction Temperature
Sensor is not functioning.
E10 or E11 Heat Pump Coil Temperature
Sensor is not functioning.
E40 or E41 Heat Pump Discharge
Temperature Sensor is not
functioning.
Edr Not enough water in the tank
(tank not full). This is also
referred to as “Dry Fire”.
Refer to “Verify Connections and Completely Fill Tank”
section on page 14.-Open all hot water taps in home and run
until water (uninterrupted) flows from all open hot water
taps.
EPL Power supply voltage is too low. Check the power supply to the unit and make sure it is higher
than 187V. For further information refer to Step 11 on page
15
EDH Heat Pump Discharge
Temperature is too high.
Contact a qualified technician to service the unit.
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