SPRSUN
SPRSUN 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
Pool heat pump will not start; display shows E01 and compressor does not engage.
High Pressure Protection Trip
E02
Pool heat pump stops heating and displays E02; fan may run but compressor shuts down.
Low Pressure Protection / Low Refrigerant
E03
Unit displays E03 and will not heat; compressor does not start or stops shortly after starting.
Compressor Overload / Overcurrent Protection
E04
Display shows E04 and unit shuts down; may occur during very cold or very hot ambient conditions.
Evaporator Coil Temperature Sensor Fault / Anti-freeze Protection
E05
Unit displays E05 and stops; water temperature reading is erratic or clearly incorrect.
Water Outlet Temperature Sensor Fault
E06
Display shows E06; unit may not start or may shut down shortly after starting.
Water Inlet Temperature Sensor Fault
E07
Unit shows E07 and stops; fan may not run or runs briefly then stops.
Fan Motor Fault / Fan Feedback Error
E08
Display shows E08; unit may not respond to keypad or may behave erratically.
Communication Failure Between Display Panel and Main PCB
E09
Unit displays E09 and will not start heating; may occur after power fluctuations.
Phase / Voltage Protection (for 3‑phase models) or Power Supply Error
E10
Display shows E10; unit does not start heating even though pump is running.
Water Flow Protection / Flow Switch Open
E11
Unit shows E11 and stops; may be accompanied by very high water temperature reading.
Water Overheat Protection
E12
Display shows E12; unit may not start or may shut down intermittently.
Ambient Air Temperature Sensor Fault
E13
Unit displays E13 and will not start; often appears on inverter-type SPRSUN pool heaters.
Inverter / Compressor Drive Fault
E14
Display shows E14; unit may start and stop repeatedly without heating properly.
Defrost Sensor / Defrost System Fault
E15
Unit shows E15 and stops; may be associated with abnormal compressor noise or vibration.
Discharge Temperature Protection
E16
Display shows E16; unit may not start or may shut down unexpectedly.
EEPROM / Parameter Memory Error
E17
Unit displays E17; heating capacity is reduced or unit will not start in cold weather.
Low Ambient Lockout / Protection
E18
Display shows E18; unit may not start or may shut down during operation.
Water Pump Interlock / Pump Feedback Fault
E19
Unit shows E19; may be associated with irregular compressor speed on inverter models.
Compressor Speed Feedback Error
E20
Display shows E20; unit may not respond to remote or Wi-Fi app.
Communication Error with External Controller / BMS
Symptom
Compressor runs but fan cycles on and off frequently or runs at inconsistent speeds (on inverter models).
Fan Speed Control Issue
Symptom
Control panel buttons do not respond or respond intermittently.
Keypad / HMI Failure
Symptom
Corrosion or rust visible on metal parts of the heater cabinet or fasteners.
Environmental Corrosion
Symptom
Display is on but compressor and fan never start; unit always shows standby even when heat is requested.
Control Logic / Demand Signal Fault
Symptom
Display shows unrealistic ambient or water temperatures but no specific error code.
Sensor Drift / Calibration Error
Symptom
Excessive water dripping around the unit during operation; owner suspects a leak.
Excessive Condensation
Symptom
Fan does not spin but compressor appears to run; unit becomes very hot on top.
Fan Failure without Error Code
Symptom
Heater causes interference with nearby electronics or Wi‑Fi when running.
Electromagnetic Interference (EMI)
Symptom
Heater operates but causes noticeable drop in water pressure or flow to pool returns.
Excessive Hydraulic Resistance
Symptom
Heater runs in cooling mode instead of heating, or pool gets colder when heater is on.
Incorrect Mode or Reversing Valve Issue
Symptom
Heater starts then stops after a short time; frequent on/off cycling without reaching temperature.
Short Cycling
Symptom
High-pitched whistling or hissing noise from the unit while running.
Refrigerant Flow Noise / Expansion Valve Noise
Symptom
Ice forms on the evaporator coil and/or base of the unit; airflow is reduced.
Coil Icing / Defrost Problem
Symptom
Loud rattling or vibrating noise from the pool heater during operation.
Mechanical Vibration / Loose Components
Symptom
Pool heater runs but water does not reach set temperature; very slow heating performance.
Insufficient Heating Capacity / Performance Degradation
Symptom
Pool heater will not start at all; display is blank and no lights are on.
No Power / Dead Unit
Symptom
Unit is unusually loud during startup compared to normal operation.
Startup Noise / Hydraulic or Refrigerant Shock
Symptom
Unit produces a strong chemical or burning smell during operation.
Overheating Electrical Component or Contaminant on Coil
Symptom
Unit trips the house breaker when starting or during operation.
Overcurrent / Short Circuit
Symptom
Water leaking from the base of the SPRSUN pool heater.
Water Leak from Plumbing or Heat Exchanger
Symptom
Water temperature overshoots the setpoint by several degrees before the heater shuts off.
Temperature Control Overshoot
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Pool heat pump will not start; display shows E01 and compressor does not engage.
|
High Pressure Protection Trip | View Details |
| E02 |
Pool heat pump stops heating and displays E02; fan may run but compressor shuts down.
|
Low Pressure Protection / Low Refrigerant | View Details |
| E03 |
Unit displays E03 and will not heat; compressor does not start or stops shortly after starting.
|
Compressor Overload / Overcurrent Protection | View Details |
| E04 |
Display shows E04 and unit shuts down; may occur during very cold or very hot ambient conditions.
|
Evaporator Coil Temperature Sensor Fault / Anti-freeze Protection | View Details |
| E05 |
Unit displays E05 and stops; water temperature reading is erratic or clearly incorrect.
|
Water Outlet Temperature Sensor Fault | View Details |
| E06 |
Display shows E06; unit may not start or may shut down shortly after starting.
|
Water Inlet Temperature Sensor Fault | View Details |
| E07 |
Unit shows E07 and stops; fan may not run or runs briefly then stops.
|
Fan Motor Fault / Fan Feedback Error | View Details |
| E08 |
Display shows E08; unit may not respond to keypad or may behave erratically.
|
Communication Failure Between Display Panel and Main PCB | View Details |
| E09 |
Unit displays E09 and will not start heating; may occur after power fluctuations.
|
Phase / Voltage Protection (for 3‑phase models) or Power Supply Error | View Details |
| E10 |
Display shows E10; unit does not start heating even though pump is running.
|
Water Flow Protection / Flow Switch Open | View Details |
| E11 |
Unit shows E11 and stops; may be accompanied by very high water temperature reading.
|
Water Overheat Protection | View Details |
| E12 |
Display shows E12; unit may not start or may shut down intermittently.
|
Ambient Air Temperature Sensor Fault | View Details |
| E13 |
Unit displays E13 and will not start; often appears on inverter-type SPRSUN pool heaters.
|
Inverter / Compressor Drive Fault | View Details |
| E14 |
Display shows E14; unit may start and stop repeatedly without heating properly.
|
Defrost Sensor / Defrost System Fault | View Details |
| E15 |
Unit shows E15 and stops; may be associated with abnormal compressor noise or vibration.
|
Discharge Temperature Protection | View Details |
| E16 |
Display shows E16; unit may not start or may shut down unexpectedly.
|
EEPROM / Parameter Memory Error | View Details |
| E17 |
Unit displays E17; heating capacity is reduced or unit will not start in cold weather.
|
Low Ambient Lockout / Protection | View Details |
| E18 |
Display shows E18; unit may not start or may shut down during operation.
|
Water Pump Interlock / Pump Feedback Fault | View Details |
| E19 |
Unit shows E19; may be associated with irregular compressor speed on inverter models.
|
Compressor Speed Feedback Error | View Details |
| E20 |
Display shows E20; unit may not respond to remote or Wi-Fi app.
|
Communication Error with External Controller / BMS | View Details |
| – |
Compressor runs but fan cycles on and off frequently or runs at inconsistent speeds (on inverter models).
|
Fan Speed Control Issue | View Details |
| – |
Control panel buttons do not respond or respond intermittently.
|
Keypad / HMI Failure | View Details |
| – |
Corrosion or rust visible on metal parts of the heater cabinet or fasteners.
|
Environmental Corrosion | View Details |
| – |
Display is on but compressor and fan never start; unit always shows standby even when heat is requested.
|
Control Logic / Demand Signal Fault | View Details |
| – |
Display shows unrealistic ambient or water temperatures but no specific error code.
|
Sensor Drift / Calibration Error | View Details |
| – |
Excessive water dripping around the unit during operation; owner suspects a leak.
|
Excessive Condensation | View Details |
| – |
Fan does not spin but compressor appears to run; unit becomes very hot on top.
|
Fan Failure without Error Code | View Details |
| – |
Heater causes interference with nearby electronics or Wi‑Fi when running.
|
Electromagnetic Interference (EMI) | View Details |
| – |
Heater operates but causes noticeable drop in water pressure or flow to pool returns.
|
Excessive Hydraulic Resistance | View Details |
| – |
Heater runs in cooling mode instead of heating, or pool gets colder when heater is on.
|
Incorrect Mode or Reversing Valve Issue | View Details |
| – |
Heater starts then stops after a short time; frequent on/off cycling without reaching temperature.
|
Short Cycling | View Details |
| – |
High-pitched whistling or hissing noise from the unit while running.
|
Refrigerant Flow Noise / Expansion Valve Noise | View Details |
| – |
Ice forms on the evaporator coil and/or base of the unit; airflow is reduced.
|
Coil Icing / Defrost Problem | View Details |
| – |
Loud rattling or vibrating noise from the pool heater during operation.
|
Mechanical Vibration / Loose Components | View Details |
| – |
Pool heater runs but water does not reach set temperature; very slow heating performance.
|
Insufficient Heating Capacity / Performance Degradation | View Details |
| – |
Pool heater will not start at all; display is blank and no lights are on.
|
No Power / Dead Unit | View Details |
| – |
Unit is unusually loud during startup compared to normal operation.
|
Startup Noise / Hydraulic or Refrigerant Shock | View Details |
| – |
Unit produces a strong chemical or burning smell during operation.
|
Overheating Electrical Component or Contaminant on Coil | View Details |
| – |
Unit trips the house breaker when starting or during operation.
|
Overcurrent / Short Circuit | View Details |
| – |
Water leaking from the base of the SPRSUN pool heater.
|
Water Leak from Plumbing or Heat Exchanger | View Details |
| – |
Water temperature overshoots the setpoint by several degrees before the heater shuts off.
|
Temperature Control Overshoot | View Details |
No matching codes found
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