Ignition Failure
Hayward Pool Heater
Severity:What Does This Error Mean?
A Hayward pool heater that clicks but does not ignite usually has a gas supply issue, a dirty or failed igniter, or a dirty flame sensor that cannot confirm the flame. Check that the gas supply is on and that other gas appliances in the home work. If the heater produces an ignition fault code (IF or AFS), this points to the igniter or gas valve.
Affected Models
- Hayward H-Series H150FDP
- Hayward H250FDP
- Hayward H350FDP
- Hayward H400FDP
- All Hayward H-Series heaters
Common Causes
- Gas supply valve closed or gas pressure too low
- Igniter electrode fouled with debris or carbon
- Flame sensor dirty — cannot confirm a flame
- Pilot light blown out (older models with pilot ignition)
- Air shutter blocked causing a rich mixture that will not ignite
- Gas valve fault
How to Fix It
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Confirm the gas supply valve at the heater is open.
The manual gas shutoff valve behind or beside the heater must be in the open position (handle parallel to the pipe). Also check the main gas supply to the house is on.
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Test another gas appliance to confirm gas supply is working.
Light a gas stove burner or check the gas furnace. If no other gas appliances work, there may be a supply interruption — contact your gas provider.
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Check for an ignition fault error code on the display.
Hayward H-Series heaters display fault codes. IF = ignition failure (igniter not producing spark or gas not lighting). AFS = air flow switch fault (insufficient airflow for combustion).
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Check that the heater's air intake is not blocked.
Leaves, debris, or nearby bushes blocking the air intake cause a rich mixture that will not ignite. Clear at least 2 feet of open space around the heater's air intake vents.
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Have the igniter and flame sensor inspected by a technician.
The igniter electrode and flame sensor are the two most common parts that fail on Hayward heaters. A technician can test, clean, and replace these components safely.
When to Call a Professional
Gas appliance repairs involving the gas valve, gas line, or internal heat exchanger should be performed by a licensed pool heater technician.
Frequently Asked Questions
What does the IF error mean on a Hayward pool heater?
IF on a Hayward H-Series heater stands for Ignition Failure — the heater attempted to light 3 times and failed. The most common causes are a gas supply problem, a dirty igniter, or a dirty flame sensor.
How long should a Hayward pool heater igniter last?
A Hayward igniter electrode typically lasts 5–10 years with normal use. Frequent short cycling (the heater turning on and off many times per day) shortens igniter life considerably.