What does error code CE mean on a Hayward pool heater?

Communication error. The control module and display aren't communicating.

Can I fix Hayward code CE myself?

Start with these safe checks: Turn the heater's power off for a minute and back on. If CE returns, call a qualified tech.

When should I call a technician for code CE?

If CE returns, call a qualified tech. Smell gas? Leave right away, don't touch light switches or phones inside, and call your gas utility or 911 from outside. Never open a gas valve, burner, gas line, vent or flue connection, or bypass a safety switch. Repeated lockouts, scorching, soot, or a CO alarm mean shut it off and call a licensed gas technician.

Hayward pool heater error code

Hayward pool heater code CE: Communication error

Hayward Universal H-Series gas heaters

What CE means

The control module and display aren't communicating.

Likely causes

Loose cable
Board fault

Safe first checks

Turn the heater's power off for a minute and back on.

When to stop

If CE returns, call a qualified tech.

Checked against: Hayward Universal H-Series heater troubleshooting guide (UHS16b): diagnostic codes. Codes can differ by model and year, so confirm with your owner's manual.