Nirvana
Nirvana 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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F01
Heater will not start; display shows F01 shortly after a call for heat.
Water Flow Fault / Insufficient Flow
F02
Heater attempts to start but shuts down with F02; fan may run briefly.
Ignition Failure / No Flame Detected
F03
Heater locks out with F03; the unit may start then shut down after a few seconds of flame.
Flame Loss During Operation
F04
The display shows F04, and the heater will not fire; the fan may not start.
Air Pressure Switch / Combustion Air Fault
F05
The heater shuts down with F05; the water is hot, but the unit stops before reaching the set temperature.
High Limit Switch Trip / Overheat
F06
The display shows F06; the heater does not respond to thermostat changes.
Water Temperature Sensor Fault (Thermistor Error)
F07
The heater displays F07 and will not fire; this may occur immediately on power-up.
Outlet Temperature Sensor Fault / Stack Sensor Error
F08
The F08 error appears; the heater may start but shuts down quickly, often in cold weather.
Freeze Protection / Low Water Temperature Fault
F09
The heater shows F09 and will not respond to thermostat or mode changes.
User Interface / Keypad Communication Error
F10
The F10 error appears; the heater does not start or shuts down unexpectedly.
Gas Valve Circuit Fault
F11
The heater displays F11; the fan may run continuously or not at all.
Combustion Blower Fault
F12
The F12 error appears; the heater may start but shuts down when switching between pool and spa modes.
Mode Valve / External Control Fault
F13
Heater displays F13; the unit may not recognize the water flow direction or inlet/outlet configuration.
Reversible Manifold / Flow Direction Sensor Error
F14
F14 error appears intermittently; the heater may operate but occasionally locks out.
Low Voltage / Power Supply Fault
F15
Heater displays F15; the unit may not detect water pressure correctly.
Water Pressure Switch Fault
F16
F16 error; the heater may indicate an internal communication failure between boards.
Internal Communication Error (Main Board to Ignition Module)
F17
Heater displays F17; the unit may overheat quickly or report unrealistic temperature changes.
Outlet Water Temperature Sensor Fault
F18
F18 error; the heater may not recognize remote thermostat or automation commands.
Remote Thermostat / External Sensor Fault
F19
Heater displays F19; the unit may shut down due to a detected flue blockage.
Blocked Flue / Vent Safety Fault
F20
F20 error; the heater may indicate internal memory or configuration corruption.
Configuration / EEPROM Fault
Symptom
Heater cabinet shows signs of rust and corrosion, especially near the base and around plumbing connections.
Corrosion Damage / Environmental Degradation
Symptom
Heater cabinet vibrates excessively or rattles loudly during operation.
Mechanical Vibration / Loose Components
Symptom
Heater display is dim, flickering, or hard to read.
Display Backlight / Power Issue
Symptom
Heater display is on but unresponsive; buttons do not change settings.
Keypad Failure / Stuck Buttons
Symptom
Heater display shows erratic or fluctuating temperature readings.
Unstable Temperature Sensing
Symptom
Heater emits a strong burning or plastic smell when running.
Overheating Components / Electrical Overload
Symptom
Heater emits a strong gas smell around the unit, especially at startup.
Gas Leak / Incomplete Ignition
Symptom
Heater fan runs but burners do not light; no error code displayed.
No Ignition Without Fault Code
Symptom
Heater operates but produces visible soot or dark staining on the exhaust outlet.
Sooting / Incomplete Combustion
Symptom
Heater produces loud banging or knocking noises during operation.
Kettling / Boiling in Heat Exchanger
Symptom
Heater runs but causes noticeable air bubbles or turbulence in the pool returns.
Air Entrapment / Plumbing Configuration Issue
Symptom
Heater shuts down when it rains or after heavy splashing near the equipment pad.
Moisture Intrusion / Water in Controls
Symptom
Heater starts and stops frequently (short cycling) without maintaining a stable temperature.
Short Cycling / Improper Control
Symptom
Heater starts but shuts off after a few minutes; water is only slightly warm.
Premature Shutdown / Safety Trip
Symptom
Heater trips the electrical breaker when attempting to start.
Electrical Short / Overcurrent
Symptom
Heater will not start when controlled by pool automation, but starts manually at the heater.
External Control Integration Issue
Symptom
The heater runs but the pool water does not reach the set temperature or heats very slowly.
Insufficient Heating Capacity / Performance Loss
Symptom
The heater will not start at all; the display is blank and no lights are on.
No Power / Dead Unit
Symptom
Water leaking from the bottom of the heater cabinet.
Internal Water Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| F01 |
Heater will not start; display shows F01 shortly after a call for heat.
|
Water Flow Fault / Insufficient Flow | View Details |
| F02 |
Heater attempts to start but shuts down with F02; fan may run briefly.
|
Ignition Failure / No Flame Detected | View Details |
| F03 |
Heater locks out with F03; the unit may start then shut down after a few seconds of flame.
|
Flame Loss During Operation | View Details |
| F04 |
The display shows F04, and the heater will not fire; the fan may not start.
|
Air Pressure Switch / Combustion Air Fault | View Details |
| F05 |
The heater shuts down with F05; the water is hot, but the unit stops before reaching the set temperature.
|
High Limit Switch Trip / Overheat | View Details |
| F06 |
The display shows F06; the heater does not respond to thermostat changes.
|
Water Temperature Sensor Fault (Thermistor Error) | View Details |
| F07 |
The heater displays F07 and will not fire; this may occur immediately on power-up.
|
Outlet Temperature Sensor Fault / Stack Sensor Error | View Details |
| F08 |
The F08 error appears; the heater may start but shuts down quickly, often in cold weather.
|
Freeze Protection / Low Water Temperature Fault | View Details |
| F09 |
The heater shows F09 and will not respond to thermostat or mode changes.
|
User Interface / Keypad Communication Error | View Details |
| F10 |
The F10 error appears; the heater does not start or shuts down unexpectedly.
|
Gas Valve Circuit Fault | View Details |
| F11 |
The heater displays F11; the fan may run continuously or not at all.
|
Combustion Blower Fault | View Details |
| F12 |
The F12 error appears; the heater may start but shuts down when switching between pool and spa modes.
|
Mode Valve / External Control Fault | View Details |
| F13 |
Heater displays F13; the unit may not recognize the water flow direction or inlet/outlet configuration.
|
Reversible Manifold / Flow Direction Sensor Error | View Details |
| F14 |
F14 error appears intermittently; the heater may operate but occasionally locks out.
|
Low Voltage / Power Supply Fault | View Details |
| F15 |
Heater displays F15; the unit may not detect water pressure correctly.
|
Water Pressure Switch Fault | View Details |
| F16 |
F16 error; the heater may indicate an internal communication failure between boards.
|
Internal Communication Error (Main Board to Ignition Module) | View Details |
| F17 |
Heater displays F17; the unit may overheat quickly or report unrealistic temperature changes.
|
Outlet Water Temperature Sensor Fault | View Details |
| F18 |
F18 error; the heater may not recognize remote thermostat or automation commands.
|
Remote Thermostat / External Sensor Fault | View Details |
| F19 |
Heater displays F19; the unit may shut down due to a detected flue blockage.
|
Blocked Flue / Vent Safety Fault | View Details |
| F20 |
F20 error; the heater may indicate internal memory or configuration corruption.
|
Configuration / EEPROM Fault | View Details |
| – |
Heater cabinet shows signs of rust and corrosion, especially near the base and around plumbing connections.
|
Corrosion Damage / Environmental Degradation | View Details |
| – |
Heater cabinet vibrates excessively or rattles loudly during operation.
|
Mechanical Vibration / Loose Components | View Details |
| – |
Heater display is dim, flickering, or hard to read.
|
Display Backlight / Power Issue | View Details |
| – |
Heater display is on but unresponsive; buttons do not change settings.
|
Keypad Failure / Stuck Buttons | View Details |
| – |
Heater display shows erratic or fluctuating temperature readings.
|
Unstable Temperature Sensing | View Details |
| – |
Heater emits a strong burning or plastic smell when running.
|
Overheating Components / Electrical Overload | View Details |
| – |
Heater emits a strong gas smell around the unit, especially at startup.
|
Gas Leak / Incomplete Ignition | View Details |
| – |
Heater fan runs but burners do not light; no error code displayed.
|
No Ignition Without Fault Code | View Details |
| – |
Heater operates but produces visible soot or dark staining on the exhaust outlet.
|
Sooting / Incomplete Combustion | View Details |
| – |
Heater produces loud banging or knocking noises during operation.
|
Kettling / Boiling in Heat Exchanger | View Details |
| – |
Heater runs but causes noticeable air bubbles or turbulence in the pool returns.
|
Air Entrapment / Plumbing Configuration Issue | View Details |
| – |
Heater shuts down when it rains or after heavy splashing near the equipment pad.
|
Moisture Intrusion / Water in Controls | View Details |
| – |
Heater starts and stops frequently (short cycling) without maintaining a stable temperature.
|
Short Cycling / Improper Control | View Details |
| – |
Heater starts but shuts off after a few minutes; water is only slightly warm.
|
Premature Shutdown / Safety Trip | View Details |
| – |
Heater trips the electrical breaker when attempting to start.
|
Electrical Short / Overcurrent | View Details |
| – |
Heater will not start when controlled by pool automation, but starts manually at the heater.
|
External Control Integration Issue | View Details |
| – |
The heater runs but the pool water does not reach the set temperature or heats very slowly.
|
Insufficient Heating Capacity / Performance Loss | View Details |
| – |
The heater will not start at all; the display is blank and no lights are on.
|
No Power / Dead Unit | View Details |
| – |
Water leaking from the bottom of the heater cabinet.
|
Internal Water Leak | View Details |
No matching codes found
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