Pool Heater Error Codes – Meanings & Fixes

What do pool heater error codes mean?

Pool heater error codes are diagnostic messages that indicate a fault with the heater’s operation. These codes help identify issues such as ignition failure, low water flow, overheating, or sensor faults.

• Ignition failure or flame detection issues
• Low water flow or circulation problems
• High temperature or overheating shutdown
• Sensor or thermostat faults
• Electrical or control board issues

If your pool heater is displaying an error code, use the guides below to identify the problem and find the correct solution.

Common Pool Heater Error Code Causes

Most error codes are triggered by a small number of common system faults. Understanding these causes can help you diagnose problems quickly.

• Low water flow or blocked filter
• Pressure switch or flow switch faults
• Temperature sensor faults
• Ignition or flame detection failure
• Control board or electrical faults

Pool Heater Error Codes by Brand

Different pool heater brands use specific error codes and control systems. Select your heater brand below to view detailed troubleshooting guides.

AstralPool Viron Heater Error Codes

Viron gas heaters use digital fault codes to identify issues such as ignition failure, airflow problems, overheating, and sensor faults.

• Viron F0 Error
• Viron F1 Error
• Viron F2 Error
• Viron F6 Error
• Viron F7 Error

View full Viron error code guide →

Hurlcon Heater Error Codes

Hurlcon gas heaters use multiple safety shutdown codes to protect the system during abnormal conditions.

• Hurlcon F0 Error
• Hurlcon F1 Error
• Hurlcon F2 Error
• Hurlcon MX F4 Error

View full Hurlcon error code guide →

Raypak Heater Error Codes

Raypak heaters may display fault codes related to ignition, flame rectification, temperature limits, and water flow.

View Raypak troubleshooting guide →

Pentair MasterTemp Error Codes

Pentair MasterTemp heaters use diagnostic indicators to identify issues with ignition, pressure, and thermal regulation.

View Pentair MasterTemp troubleshooting →

Hayward H-Series Heater Error Codes

Hayward heaters can display fault conditions related to ignition, flow issues, and temperature safety shutdown.

View Hayward troubleshooting guide →

Related Pool Heater Problems

• Pool heater not heating
• Pool heater not igniting
• Heater starts then stops
• Full troubleshooting guide

When to Call a Pool Heater Technician

If your heater is displaying persistent error codes or shutting down repeatedly, professional diagnosis is recommended. Many faults involve gas supply, electrical systems, or internal components that require licensed repair.

Book a Pool Heater Repair →

This guide is for general troubleshooting only. HeaterFix recommends all repairs be carried out by a licensed technician.