ECO
Installation Instructions and Use & Care Guide
40
21.2.
ERROR CODES
The following table describes error codes and possible solutions. If your water heater displays an error code,
call a qualified service agent to fix the problem.
ERROR
CODE
DESCRIPTION
WHAT TO DO
ALL
ALL
Inspect for proximity to high voltage power sources.
E0
T2 sensor error
1. Check if sensor wires are correctly connected and/ or damaged.
2. Check if T2 sensor is damaged.
3. Check T2 sensor resistance.
4. Check actual temperature in Celsius 0ºC ~ 60ºC (tol5ºC).
E1
Not applied
Not applied
E2
Not applied
Not applied
E3
Not applied
Not applied
E4
Not applied
Not applied
E5
T4 sensor error
1. Check if sensor wires are correctly connected and/ or damaged.
2. Check if T4 sensor is damaged.
3. Check T4 sensor resistance.
4. Check actual temperature, range is 86ºF to 230ºF.
5. Check for refrigerant leakage or damaged piping.
E6
Not applied
Not applied
E7
Heat pump error
1. Powering the water heater off and restart.
2. Press ENTER and UP to enter Diagnostic Function and check
error code history.
E8
Water temperature
too high (T2 greater
than 165ºF)
1. Check if sensor wires are correctly connected and/or damaged.
2. Check if T2 sensor is damaged.
3. Power water heater off and restart.
4. Replace T2 sensor
P0
Not applied
Not applied
P1
Not applied
Not applied
P2
Run condition E
Checked continuously. T4 sensor must be greater than 240ºF
P4
High compressor
current
1. Ensure compressor operating current and voltage match the
rating label.
2. Check if compressor or related connections are damaged.
P5
Not applied
Not applied
P6
Run condition A
Checked 5 minutes from compressor startup. T4 temperature must
increase greater than 15ºF.
P7
Run condition B
Checked every 30 minutes. T4 temperature should be greater than
100ºF.
P8
Upper element error
1. Powering the water heater off and restart.
2. Check electrical supply voltage.
3. Remove cover and check element connections and/ or damage.
4. Check for damage to power wire through current sensor loop in
control board.
PA
Not applied
Not applied
