Hayward Pool Heater Error Code 09: How to Fix It

Q: What does error code 09 mean on a Hayward pool heater?

Error code 09 means the high limit switch has tripped due to overheating. This is a safety feature to protect the heater.

Q: How do I reset the high limit switch on a Hayward heater?

Locate the small reset button on the high limit switch (usually on the control board or heat exchanger) and press it firmly until it clicks. Wait for the heater to cool down first.

Q: Why does my Hayward heater keep showing error 09?

Common causes include low water flow, a clogged filter, a faulty temperature sensor, or a stuck bypass valve. Check water flow and inspect components.

Q: Can I bypass the high limit switch temporarily?

No. Bypassing the high limit switch is dangerous and can cause fire or equipment damage. Always fix the underlying issue.

Q: How much does it cost to fix error code 09?

DIY repairs cost under $50 for parts like a new high limit switch. Professional service typically ranges from $150 to $300 including diagnosis.

Abstract

Hayward pool heater error code 09 indicates that the high limit switch has tripped, often due to overheating. This safety feature shuts down the heater to prevent damage. Common causes include restricted water flow, a faulty temperature sensor, or a malfunctioning bypass valve.