Hayward H-Series heater igniter replacement on a daylight pad

How to Replace a Hayward H-Series Heater Igniter

June 2, 2026

The hot surface igniter (HSI) on a Hayward Universal H-Series heater is one of the most common parts to fail — the silicon carbide element glows orange to ignite the gas, and over time the element cracks from thermal cycling. Replacement is a 30-minute job and restores ignition reliability.

When to replace

Heater shows persistent IF (Ignition Failure) errors even after cleaning the flame sensor.
You can’t see the igniter glow orange during ignition attempts.
Visible cracks in the silicon carbide element.
The igniter is more than 5–7 years old.

What you’ll need

Hayward HDF Ignition Kit (HDXFIGFS002 or model-specific variant) — usually includes igniter + flame sensor
1/4″ nut driver or socket
Phillips screwdriver
Multimeter (to verify igniter continuity before vs. after)

Power off at the breaker. The heater’s control board operates at 24V, but the supply circuit is 120V or 240V. Always cut the main heater breaker before removing access panels.

Step-by-step

1Cut power at the breaker and shut off the gas supply.

2Remove the heater’s top and front access panels.

Most Universal H-Series panels are held by 4–6 screws. Set them aside on a clean surface.

3Locate the igniter inside the burner tray.

The HSI is a small ceramic element about 1–2 inches long, mounted on a bracket near the burner. It has two wire leads going to the control board.

4Disconnect the igniter leads.

Pull the spade connectors from the wiring harness. Note orientation if the wires are different colors.

5Unbolt the igniter from its bracket.

Usually a single screw or nut. Lift the old igniter out.

6Install the new igniter.

Reverse the removal. Don’t over-tighten the mounting screw — HSIs are ceramic and crack easily.

7Reconnect the leads.

Push the spade connectors firmly onto the new igniter terminals.

8Replace the flame sensor too.

If your ignition kit included a flame sensor, swap it now. The flame sensor is a single metal rod mounted near the burner with one wire. Replace if more than 5 years old.

9Reinstall access panels.

10Restore gas and electrical, test ignition.

Within 30–60 seconds of a call for heat, the igniter should glow orange and the burner should light. If still no ignition, see our error code troubleshooting guide.