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17
DIAGNOSTIC CODES
DISPLAY SHOWS INDICATES CORRECTIVE ACTION
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 “Heating Element
Replacement” section.
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 “Heating Element
Replacement” section.
SF The air filter is dirty. 1. Turn off power at the circuit breaker/fuse box.
2. Clean the air filter. See “Air Filter Cleaning/Replacement”
section.
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 Cleaning/Replacement”
section.
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).
Fill completely-Open all hot water taps in home and run until water
(uninterupted) 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
204V
EDH Heat Pump Discharge
Temperature is too high.
Contact a qualified technician to service the unit.
EoF
(If Accessory Condensate
Pump is installed)
Condensate pump failure. 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 technician to service the unit.
ECL Heat pump suction pressure is
too low.
Contact a qualified technician to service the unit
EEE EEPROM failure
ECC Heat pump compressor is not
functioning.
“-”,”--”,”---” Unit is doing a system diagnostic.
No action is necessary.
ICE Heat pump is in defrosting cycle.
HPO Heat pump is out of operation
envelope.
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.
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