Diagnostic Codes - A.O. Smith Vortex HPTU-50 Installation Instructions And Use & Care Manual

DIAGNOSTIC CODES

DISPLAY SHOWS
"-","--","---"
ICE
HPO
EUC
ELC
SF
ECF
E20 or E21
E30 or E31
E50 or E51
E10 or E11
E40 or E41
Edr
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.
20 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide
INDICATES
Unit is doing a system
diagnostic.
Heat pump is in defrosting
cycle.
Ambient temperature
45°F-120°F (7.2°C-49°C), average
tank temperature of 59°F (15°C)
or less.
Upper element is not
functioning
Lower element is not
functioning
The air filter is dirty.
The heat pump compressor is
starting/stopping frequently.
Upper Temperature Sensor is
not functioning.
Lower Temperature Sensor is not
functioning.
Heat Pump Suction Temperature
Sensor is not functioning.
Heat Pump Coil Temperature
Sensor is not functioning.
Heat Pump Discharge
Temperature Sensor is not
functioning.
Not enough water in the tank
(tank not full). This is also
referred to as "Dry Fire".
CORRECTIVE ACTION
Normal operation--no action
1. Turn off power at the circuit breaker/fuse box and
check for a loose connection at the element. For access
directions see "Replacing the Heating Element" Section
on page 29. If error persists proceed to the next step.
2. Replace non-functioning element. See "Replacing the
Heating Element" Section on page 29.
1. Turn off power at the circuit breaker/fuse box and
check for a loose connection at the element. For access
directions see "Replacing the Heating Element" Section
on page 29. If error persists proceed to the next step.
2. Replace non-functioning element. See "Replacing the
Heating Element" Section on page 29.
1. Turn off power at the circuit breaker/fuse box.
2. Clean the air filter. See "Air Filter Maintenance" Section
on page 32.
1. Turn off power at the circuit breaker/fuse box.
2. Clean the air filter. See "Air Filter Maintenance" Section
on page 32.
3. If error persist, please contact a qualified person to
check the fan wire connection.
Contact a qualified person to service the unit.
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.