Pool Error Code Lookup

Type a code, or part of one, to search every documented Hayward, Pentair, and Raypak code at once.

30 codes across Hayward, Pentair, and Raypak.

• AC Voltage High/LowHayward

  The drive detected incoming electrical supply voltage outside its acceptable range (generally more than about 10% above or below the pump's rated voltage).

• AOHayward

  Blower Vacuum Switch Open — the combustion blower's pressure switch did not close to confirm venting/airflow before or during ignition.

• bDHayward

  Internal Fault / Gas Valve Circuit Error — the control board detected a problem in the circuitry that drives the gas valve, such as a secondary high-voltage fault, an open internal fuse, or a bad transformer.

• CEHayward

  Communication Error — the main control board and the front display/keypad board have lost communication with each other.

• Communication FailedHayward

  The user interface/keypad has lost communication with the motor's drive electronics, or the pump has lost its link to a connected automation controller.

• Drive OverheatedHayward

  The drive's internal temperature protection tripped because the motor/drive electronics got hotter than their safe operating limit.

• HSHayward

  Water Temperature Sensing Error — the inlet water temperature sensor is reading too hot (above roughly 104°F) or is reporting an implausible/out-of-range value.

• IFHayward

  Ignition Failure — the heater tried to light the burner (typically three attempts) but never detected a flame, so it locked out the gas valve as a safety measure.

• LOHayward

  Limit String Open — one of the safety switches wired in the heater's limit string (water pressure switch, vent/pressure switch, high-temperature limit, or flue temperature limit) has opened, so the heater will not fire until the circuit closes again.

• Priming FailureHayward

  The pump ran its priming sequence but could not build suction and fill with water within the allotted time, so the drive shut the motor down to protect it from running dry.

• Communication LostPentair

  The pump's control interface has lost its communication link with the drive, or a networked pump has lost connection to home Wi-Fi or an automation controller.

• E01Pentair

  Open water temperature sensor — the control board detects a broken circuit in the main water temperature sensor.

• ERR AFSPentair

  Air flow switch open — the combustion blower's pressure switch didn't confirm adequate air circulation through the heater.

• ERR AGSPentair

  Automatic Gas Shutoff — water temperature after the second pass through the heat exchanger exceeded roughly 140°F, a hard safety lockout that disables the front panel.

• ERR HLSPentair

  High-limit switch open — water temperature after the first pass through the heat exchanger exceeded roughly 135°F, tripping a safety shutoff.

• ERR IGNPentair

  Ignition control fault — the heater attempted to light the burner but the ignition control module never detected a flame, so it locked out.

• ERR PSPentair

  Water pressure switch open — the heater isn't seeing confirmed water flow, so it won't fire.

• Over CurrentPentair

  The drive detected the motor drawing more current than it should, and shut down to protect the motor and electronics.

• OverheatPentair

  The drive's thermal protection tripped because the motor or drive electronics exceeded their safe operating temperature.

• Priming FailurePentair

  The pump ran through its priming cycle but never established suction, so the drive stopped the motor to avoid running it dry.

• BD1Raypak

  Board failure — the main control board's processor failed to start up correctly.

• E3Raypak

  Flow fault — the heat pump's water pressure switch hasn't confirmed that the filter pump is running and providing adequate flow.

• FFLRaypak

  False flame signal — the control detects a flame signal when the gas valve should be closed and no burner should be lit.

• HL1Raypak

  High limit 1 tripped — the primary high-limit switch opened because water temperature at the heat exchanger exceeded its safe threshold (roughly 135°F).

• HL2Raypak

  High limit 2 tripped — a secondary high-limit switch opened after temperature at the heat exchanger again exceeded the safe threshold, typically after HL1 has already been an issue.

• IGNRaypak

  Ignition failure — the heater failed to establish and hold a flame after three light attempts and went into a hard lockout.

• ILORaypak

  Ignition Lockout — the heater has given up trying to light after repeated failed attempts and needs a manual reset.

• PRSRaypak

  Low water pressure — the water pressure switch hasn't confirmed adequate flow through the heater, so it won't fire.

• ROLRaypak

  Rollout switch open — a thermal fuse or rollout switch tripped because combustion flame or heat rolled out of the normal flue path instead of venting properly.

• SNSRaypak

  Temperature sensor malfunction — a temperature sensor is reading outside its valid range (roughly 36-110°F) or its circuit appears open/shorted.

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If you haven't found the code yet, start from what the equipment is doing instead: heater won't ignite, pump won't prime, flow error, blank display, and the other symptom pages list every code that produces that behavior.