23
LP-374 REV. 3.25.14
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 0
o
C ~ 60
o
C (tol5
o
C)
E1
T3a sensor error
1. Check if sensor wires are correctly connected and/or damaged.
2. Check if T3a sensor is damaged.
3. Check T3a sensor resistance.
4. Check actual temperature, range is 23
o
F to 86
o
F.
5. Check for damage to TXV and/or capillary probe.
E4
T3b sensor error
1. Check if sensor wires are correctly connected and/or damaged.
2. Check if T3b sensor is damaged.
3. Check T3b sensor resistance.
4. Check actual temperature, range is 32
o
F to 86
o
F.
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 86
o
F to 230
o
F.
5. Check for refrigerant leakage or damaged piping.
E6
T5 sensor error
1. Check if sensor wires are correctly connected and/or damaged.
2. Check if T5 sensor is damaged.
3. Check T5 sensor resistance.
4. Check position of sensor tab, flat to be at back.
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 165
o
F)
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
Run condition C
Checked every 30 minutes. T3a temperature should be greater than 32
o
F. Recheck after 30
minutes.
P1
Run condition D
Checked every 30 minutes. Readings from (T3b
– T3a) sensors must be greater than 3
o
F.
P2
Run condition E
Checked continuously. T4 sensor must be greater than 240
o
F.
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
Air filter needs cleaning
1. Remove the air filter and clean with water or compressed air.
2. Press and hold ENTER and DOWN simultaneously to reset system.
P6
Run condition A
Checked 5 minutes from compressor startup. T4 temperature must increase greater than
15
o
F.
P7
Run condition B
Checked every 30 minutes. T4 temperature should be greater than 100
o
F.
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
Lower 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.
Table 8
– Error Codes - NOTE: See Figure 19 for sensor locations.
