Rheem Pool Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Heater will not ignite; display shows E01 shortly after a call for heat
Ignition Failure / Ignition Lockout
E02
Heater attempts to start but shuts down with E02 on the display
Flame Sense Failure / Flame Loss
E03
Heater display shows E03 and the unit will not fire
Pressure Switch / Water Flow Fault
E04
Heater locks out with E04; blower may start but burner does not light
Air Flow / Blower Proving Fault
E05
Heater shuts down with E05; may start and then quickly stop
High Limit Switch Open / Overheat Condition
E06
Display shows E06 and heater will not run
Outlet Water Temperature Sensor Fault
E07
Heater displays E07 and does not fire
Inlet Water Temperature Sensor Fault
E08
Heater shows E08 and will not operate
Exhaust Temperature Sensor / Flue Sensor Fault
E09
Heater locks out with E09; may occur during operation
Rollout Switch / Flame Rollout Detected
E10
Heater shows E10 and will not start
Gas Valve Circuit Fault
E11
Heater displays E11; unit may be unresponsive or intermittently shutting down
Control Board Communication / Internal Fault
E12
Heater shows E12 and will not respond to thermostat commands
External Control / Thermostat Input Fault
E13
Heater displays E13; may occur when switching between pool and spa modes
Water Temperature Differential / Sensor Mismatch
E14
Heater shows E14 and shuts down during operation
Low Gas Pressure / Gas Supply Fault
E15
Heater displays E15 immediately on power-up
Internal Memory / Configuration Error
E20
Heater shows E20 and will not fire when set to heat pump mode (for hybrid models)
Refrigerant Pressure / Heat Pump Protection Fault
E21
Heater displays E21; heat pump mode shuts down on cold days
Low Ambient Temperature Lockout (Heat Pump)
E30
Heater shows E30 and will not start; often associated with low-voltage issues
Low Voltage / Power Supply Fault
E31
Heater intermittently shuts down with E31 during operation
Line Frequency / Power Quality Fault
E40
Heater shows E40 and will not fire in spa mode
Spa Sensor / Mode Sensor Fault
E41
Heater shows E41 and will not fire in pool mode
Pool Sensor / Mode Sensor Fault
E50
Heater displays E50 and shuts down shortly after starting
Condensate Drain / Blocked Drain (for condensing models)
E60
Heater shows E60 and will not start; often after wiring changes
Polarity / Grounding Fault
Symptom
Heat pump pool heater runs but forms excessive ice on the outdoor coil
Heat Pump Coil Icing / Defrost Problem
Symptom
Heater blower or fan is very loud, squeals, or vibrates excessively
Blower / Fan Mechanical Failure
Symptom
Heater cabinet shows rust, corrosion, or staining around the base and vent
Corrosion / Condensate Damage
Symptom
Heater causes GFCI or RCD to trip when operating
Ground Fault / Leakage Current
Symptom
Heater cycles on and off frequently, with short run times, while trying to maintain temperature
Short Cycling Due to Control or Sizing Issues
Symptom
Heater display shows erratic or fluctuating water temperature readings
Erratic Temperature Sensing
Symptom
Heater display works but buttons do not respond or respond intermittently
Keypad / User Interface Failure
Symptom
Heater emits a strong gas smell around the unit, especially near the gas connections
Gas Leak at Heater
Symptom
Heater has power and display, but will not fire when there is a call for heat
No Heat / No Ignition Without Error Code
Symptom
Heater is running but pool or spa does not reach set temperature or heats very slowly
Insufficient Heating / Underperformance
Symptom
Heater lights but shuts off after a few seconds or minutes without showing an error
Short Cycling / Flame Dropout
Symptom
Heater makes loud banging, popping, or rumbling noises during operation
Boiling / Kettling in Heat Exchanger
Symptom
Heater produces soot, black staining on vent, or yellow/orange flames
Improper Combustion / Sooting
Symptom
Heater runs but pool water has a metallic or burnt smell after heating
Chemical Interaction / Overheating of Metals
Symptom
Heater trips the circuit breaker when it tries to start
Electrical Short / Overcurrent
Symptom
Heater will not start at all; no display, no lights, completely dead
No Power / Dead Unit
Symptom
Water leaking from the bottom or sides of the heater cabinet
Internal Water Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Heater will not ignite; display shows E01 shortly after a call for heat
|
Ignition Failure / Ignition Lockout | View Details |
| E02 |
Heater attempts to start but shuts down with E02 on the display
|
Flame Sense Failure / Flame Loss | View Details |
| E03 |
Heater display shows E03 and the unit will not fire
|
Pressure Switch / Water Flow Fault | View Details |
| E04 |
Heater locks out with E04; blower may start but burner does not light
|
Air Flow / Blower Proving Fault | View Details |
| E05 |
Heater shuts down with E05; may start and then quickly stop
|
High Limit Switch Open / Overheat Condition | View Details |
| E06 |
Display shows E06 and heater will not run
|
Outlet Water Temperature Sensor Fault | View Details |
| E07 |
Heater displays E07 and does not fire
|
Inlet Water Temperature Sensor Fault | View Details |
| E08 |
Heater shows E08 and will not operate
|
Exhaust Temperature Sensor / Flue Sensor Fault | View Details |
| E09 |
Heater locks out with E09; may occur during operation
|
Rollout Switch / Flame Rollout Detected | View Details |
| E10 |
Heater shows E10 and will not start
|
Gas Valve Circuit Fault | View Details |
| E11 |
Heater displays E11; unit may be unresponsive or intermittently shutting down
|
Control Board Communication / Internal Fault | View Details |
| E12 |
Heater shows E12 and will not respond to thermostat commands
|
External Control / Thermostat Input Fault | View Details |
| E13 |
Heater displays E13; may occur when switching between pool and spa modes
|
Water Temperature Differential / Sensor Mismatch | View Details |
| E14 |
Heater shows E14 and shuts down during operation
|
Low Gas Pressure / Gas Supply Fault | View Details |
| E15 |
Heater displays E15 immediately on power-up
|
Internal Memory / Configuration Error | View Details |
| E20 |
Heater shows E20 and will not fire when set to heat pump mode (for hybrid models)
|
Refrigerant Pressure / Heat Pump Protection Fault | View Details |
| E21 |
Heater displays E21; heat pump mode shuts down on cold days
|
Low Ambient Temperature Lockout (Heat Pump) | View Details |
| E30 |
Heater shows E30 and will not start; often associated with low-voltage issues
|
Low Voltage / Power Supply Fault | View Details |
| E31 |
Heater intermittently shuts down with E31 during operation
|
Line Frequency / Power Quality Fault | View Details |
| E40 |
Heater shows E40 and will not fire in spa mode
|
Spa Sensor / Mode Sensor Fault | View Details |
| E41 |
Heater shows E41 and will not fire in pool mode
|
Pool Sensor / Mode Sensor Fault | View Details |
| E50 |
Heater displays E50 and shuts down shortly after starting
|
Condensate Drain / Blocked Drain (for condensing models) | View Details |
| E60 |
Heater shows E60 and will not start; often after wiring changes
|
Polarity / Grounding Fault | View Details |
| – |
Heat pump pool heater runs but forms excessive ice on the outdoor coil
|
Heat Pump Coil Icing / Defrost Problem | View Details |
| – |
Heater blower or fan is very loud, squeals, or vibrates excessively
|
Blower / Fan Mechanical Failure | View Details |
| – |
Heater cabinet shows rust, corrosion, or staining around the base and vent
|
Corrosion / Condensate Damage | View Details |
| – |
Heater causes GFCI or RCD to trip when operating
|
Ground Fault / Leakage Current | View Details |
| – |
Heater cycles on and off frequently, with short run times, while trying to maintain temperature
|
Short Cycling Due to Control or Sizing Issues | View Details |
| – |
Heater display shows erratic or fluctuating water temperature readings
|
Erratic Temperature Sensing | View Details |
| – |
Heater display works but buttons do not respond or respond intermittently
|
Keypad / User Interface Failure | View Details |
| – |
Heater emits a strong gas smell around the unit, especially near the gas connections
|
Gas Leak at Heater | View Details |
| – |
Heater has power and display, but will not fire when there is a call for heat
|
No Heat / No Ignition Without Error Code | View Details |
| – |
Heater is running but pool or spa does not reach set temperature or heats very slowly
|
Insufficient Heating / Underperformance | View Details |
| – |
Heater lights but shuts off after a few seconds or minutes without showing an error
|
Short Cycling / Flame Dropout | View Details |
| – |
Heater makes loud banging, popping, or rumbling noises during operation
|
Boiling / Kettling in Heat Exchanger | View Details |
| – |
Heater produces soot, black staining on vent, or yellow/orange flames
|
Improper Combustion / Sooting | View Details |
| – |
Heater runs but pool water has a metallic or burnt smell after heating
|
Chemical Interaction / Overheating of Metals | View Details |
| – |
Heater trips the circuit breaker when it tries to start
|
Electrical Short / Overcurrent | View Details |
| – |
Heater will not start at all; no display, no lights, completely dead
|
No Power / Dead Unit | View Details |
| – |
Water leaking from the bottom or sides of the heater cabinet
|
Internal Water Leak | View Details |
No matching codes found
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