AstralPool
AstralPool Pool Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
Advertisements
E01
Heater displays E01 and will not start; this often occurs on heat pump models.
Low Refrigerant Pressure / Low-Pressure Switch Open (Heat Pump)
E02
Heat pump heater displays E02 and stops; the unit may be very hot to the touch.
High Refrigerant Pressure / High-Pressure Switch Open (Heat Pump)
E03
Heat pump heater displays E03; the unit may run but not heat effectively.
Evaporator Temperature Sensor Fault
E04
Heat pump heater displays E04 and stops; this may occur in cold, humid conditions.
Defrost Sensor / Defrost Protection Fault
E05
Heat pump heater shows E05; the unit may not start the compressor.
Compressor Overload / Thermal Protection
E06
Heat pump heater shows E06; the water temperature reading is erratic.
Water Inlet Temperature Sensor Fault (Heat Pump)
E07
Heat pump heater shows E07; the unit may shut down unexpectedly.
Water Outlet Temperature Sensor Fault (Heat Pump)
E08
Heat pump heater shows E08; the unit may not respond to commands.
Communication Fault Between Display and Main Board
E09
Heat pump heater shows E09; the unit may trip breakers or not start.
Current Protection / Overcurrent Fault
F1
Heater displays F1 and stops; this may occur intermittently during operation.
Flow Switch Open During Run
F2
Heater displays F2 and will not start; this often occurs after wiring changes or a new automation installation.
External Control / Thermostat Input Fault
F3
Heater displays F3; the fan may run, but ignition does not occur.
Ignition Lockout (Retries Exceeded)
F4
Heater displays F4; this may occur immediately after a start command.
Limit String Open (Safety Chain Open)
F5
Heater displays F5 and shuts down; this may be associated with strong wind conditions.
Flame Proving / Weak Flame Signal
F6
Heater displays F6; the fan may not start or may start then stop quickly.
Fan Motor / Fan Proving Fault
F7
Heater displays F7; this may be associated with very low ambient temperatures.
Freeze Protection / Low Temperature Fault
F8
Heater displays F8 and will not respond to keypad inputs.
Keypad / User Interface Fault
F9
Heater displays F9; this may occur after incorrect wiring or polarity issues.
Power Supply / Line Voltage Fault
H1
Heater will not start; the display shows H1 shortly after a call for heat.
Water Flow Fault / Low Water Flow
H2
Heater attempts to ignite but shuts down with an H2 error on the display.
Ignition Failure / No Flame Detected
H3
Heater starts, then quickly shuts down with an H3 error; it may cycle on and off repeatedly.
Flame Loss During Operation
H4
Heater locks out with an H4 error; the fan may run briefly, then stop (on forced-draft models).
Air Pressure Switch / Fan Proving Fault
H5
Heater displays H5 and will not fire; this may occur after long run times.
High Limit Temperature Fault
H6
Heater displays H6 and shuts down; this may occur during very hot operation.
Exhaust Overheat / Flue Temperature Fault
H7
Heater displays H7 and will not fire; no ignition attempt is heard.
Water Temperature Sensor (NTC) Fault
H8
Heater displays H8; the temperature reading on the display is obviously wrong (e.g., 0°C or 99°C constantly).
Outlet Temperature Sensor / Differential Fault
H9
Heater displays H9 and will not fire; this may occur after a power surge or lightning event.
Internal Control Board Fault
Symptom
Soot or black staining is visible around the flue terminal or on the heater casing.
Sooting / Incomplete Combustion
Symptom
The heat pump heater ices up excessively on the outdoor coil and stops heating.
Excessive Frost / Defrost Failure
Symptom
The heat pump heater runs but the fan does not spin, or spins very slowly.
Outdoor Fan Motor Failure (Heat Pump)
Symptom
The heater causes noticeable vibration or rattling noises in the equipment area.
Mechanical Vibration / Loose Components
Symptom
The heater display works but buttons do not respond or respond intermittently.
Keypad Button Failure
Symptom
The heater emits a strong gas smell around the unit, especially at startup.
Gas Leak or Incomplete Combustion
Symptom
The heater fan runs but there is no ignition sound or flame, and no error code is displayed.
No Ignition Command / Control Logic Issue
Symptom
The heater is leaking water from the base or inside the cabinet.
Internal Water Leak
Symptom
The heater makes loud banging or popping noises during operation.
Kettling / Boiling in Heat Exchanger
Symptom
The heater runs but occasionally shuts down when the pump speed is reduced (variable-speed pump).
Flow Sensitivity with Variable-Speed Pump
Symptom
The heater runs but the pool does not reach the set temperature or heats very slowly.
Insufficient Heating Capacity / Performance Issue
Symptom
The heater starts then shuts off after a few minutes without showing an error code.
Short Cycling / Premature Shutdown
Symptom
The heater trips the electrical breaker shortly after starting.
Electrical Short or Overload
Symptom
The heater will not start at all; the display is blank and no lights are on.
No Power to Heater
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Heater displays E01 and will not start; this often occurs on heat pump models.
|
Low Refrigerant Pressure / Low-Pressure Switch Open (Heat Pump) | View Details |
| E02 |
Heat pump heater displays E02 and stops; the unit may be very hot to the touch.
|
High Refrigerant Pressure / High-Pressure Switch Open (Heat Pump) | View Details |
| E03 |
Heat pump heater displays E03; the unit may run but not heat effectively.
|
Evaporator Temperature Sensor Fault | View Details |
| E04 |
Heat pump heater displays E04 and stops; this may occur in cold, humid conditions.
|
Defrost Sensor / Defrost Protection Fault | View Details |
| E05 |
Heat pump heater shows E05; the unit may not start the compressor.
|
Compressor Overload / Thermal Protection | View Details |
| E06 |
Heat pump heater shows E06; the water temperature reading is erratic.
|
Water Inlet Temperature Sensor Fault (Heat Pump) | View Details |
| E07 |
Heat pump heater shows E07; the unit may shut down unexpectedly.
|
Water Outlet Temperature Sensor Fault (Heat Pump) | View Details |
| E08 |
Heat pump heater shows E08; the unit may not respond to commands.
|
Communication Fault Between Display and Main Board | View Details |
| E09 |
Heat pump heater shows E09; the unit may trip breakers or not start.
|
Current Protection / Overcurrent Fault | View Details |
| F1 |
Heater displays F1 and stops; this may occur intermittently during operation.
|
Flow Switch Open During Run | View Details |
| F2 |
Heater displays F2 and will not start; this often occurs after wiring changes or a new automation installation.
|
External Control / Thermostat Input Fault | View Details |
| F3 |
Heater displays F3; the fan may run, but ignition does not occur.
|
Ignition Lockout (Retries Exceeded) | View Details |
| F4 |
Heater displays F4; this may occur immediately after a start command.
|
Limit String Open (Safety Chain Open) | View Details |
| F5 |
Heater displays F5 and shuts down; this may be associated with strong wind conditions.
|
Flame Proving / Weak Flame Signal | View Details |
| F6 |
Heater displays F6; the fan may not start or may start then stop quickly.
|
Fan Motor / Fan Proving Fault | View Details |
| F7 |
Heater displays F7; this may be associated with very low ambient temperatures.
|
Freeze Protection / Low Temperature Fault | View Details |
| F8 |
Heater displays F8 and will not respond to keypad inputs.
|
Keypad / User Interface Fault | View Details |
| F9 |
Heater displays F9; this may occur after incorrect wiring or polarity issues.
|
Power Supply / Line Voltage Fault | View Details |
| H1 |
Heater will not start; the display shows H1 shortly after a call for heat.
|
Water Flow Fault / Low Water Flow | View Details |
| H2 |
Heater attempts to ignite but shuts down with an H2 error on the display.
|
Ignition Failure / No Flame Detected | View Details |
| H3 |
Heater starts, then quickly shuts down with an H3 error; it may cycle on and off repeatedly.
|
Flame Loss During Operation | View Details |
| H4 |
Heater locks out with an H4 error; the fan may run briefly, then stop (on forced-draft models).
|
Air Pressure Switch / Fan Proving Fault | View Details |
| H5 |
Heater displays H5 and will not fire; this may occur after long run times.
|
High Limit Temperature Fault | View Details |
| H6 |
Heater displays H6 and shuts down; this may occur during very hot operation.
|
Exhaust Overheat / Flue Temperature Fault | View Details |
| H7 |
Heater displays H7 and will not fire; no ignition attempt is heard.
|
Water Temperature Sensor (NTC) Fault | View Details |
| H8 |
Heater displays H8; the temperature reading on the display is obviously wrong (e.g., 0°C or 99°C constantly).
|
Outlet Temperature Sensor / Differential Fault | View Details |
| H9 |
Heater displays H9 and will not fire; this may occur after a power surge or lightning event.
|
Internal Control Board Fault | View Details |
| – |
Soot or black staining is visible around the flue terminal or on the heater casing.
|
Sooting / Incomplete Combustion | View Details |
| – |
The heat pump heater ices up excessively on the outdoor coil and stops heating.
|
Excessive Frost / Defrost Failure | View Details |
| – |
The heat pump heater runs but the fan does not spin, or spins very slowly.
|
Outdoor Fan Motor Failure (Heat Pump) | View Details |
| – |
The heater causes noticeable vibration or rattling noises in the equipment area.
|
Mechanical Vibration / Loose Components | View Details |
| – |
The heater display works but buttons do not respond or respond intermittently.
|
Keypad Button Failure | View Details |
| – |
The heater emits a strong gas smell around the unit, especially at startup.
|
Gas Leak or Incomplete Combustion | View Details |
| – |
The heater fan runs but there is no ignition sound or flame, and no error code is displayed.
|
No Ignition Command / Control Logic Issue | View Details |
| – |
The heater is leaking water from the base or inside the cabinet.
|
Internal Water Leak | View Details |
| – |
The heater makes loud banging or popping noises during operation.
|
Kettling / Boiling in Heat Exchanger | View Details |
| – |
The heater runs but occasionally shuts down when the pump speed is reduced (variable-speed pump).
|
Flow Sensitivity with Variable-Speed Pump | View Details |
| – |
The heater runs but the pool does not reach the set temperature or heats very slowly.
|
Insufficient Heating Capacity / Performance Issue | View Details |
| – |
The heater starts then shuts off after a few minutes without showing an error code.
|
Short Cycling / Premature Shutdown | View Details |
| – |
The heater trips the electrical breaker shortly after starting.
|
Electrical Short or Overload | View Details |
| – |
The heater will not start at all; the display is blank and no lights are on.
|
No Power to Heater | View Details |
No matching codes found
Advertisements