When your pool or spa heater fails to ignite, a worn or cracked igniter is often the culprit. The Hayward HAXIGN1931 is a direct-replacement igniter assembly engineered for H-Series induced draft, electronic ED2, and millivolt/electronic ED1 style heaters -- covering models from H150 through H400. It ships with a stainless steel mounting bracket so you have everything needed for a clean swap.
Pool heater igniters degrade over time from heat cycling, moisture exposure, and mineral buildup. A failing igniter produces weak spark or no spark at all, resulting in lockout codes, failed start attempts, or a heater that runs the blower but never lights the burner. The HAXIGN1931 restores reliable ignition using the same form factor as the factory part -- no modifications, no adapter plates.
This assembly is also catalogued under NBK Parts number 20372, making it straightforward to cross-reference against service records or legacy parts invoices. If your existing documentation lists 20372, this is the correct replacement.
Fits H150, H200, H210, H250, H300, H350, and H400 heaters across H-Series induced draft, ED2 electronic, and ED1 millivolt/electronic variants.
The mounting bracket is included in the box -- stainless steel construction resists corrosion from pool chemical off-gassing and outdoor humidity.
Matches the original igniter assembly geometry for a drop-in fit. No drilling, cutting, or fabrication required during installation.
Dual-catalogued under Hayward HAXIGN1931 and NBK Parts 20372. Either number confirms you have the right part for your service record.
Hayward supplies the igniter as a complete assembly -- electrode, insulator, and bracket -- rather than individual components. Replacing the full assembly ensures proper electrode gap, correct insulator condition, and a secure bracket fit, all of which affect reliable spark generation. Swapping only the electrode tip and reusing a cracked or corroded bracket is a common cause of repeat ignition failures.
Always shut off gas supply and disconnect electrical power to the heater before removing the igniter assembly. Allow the heater to cool completely before reaching into the combustion chamber area. Verify the electrode gap and wire connection are secure before restoring power. If the heater continues to display ignition fault codes after replacement, inspect the flame sensor, gas valve, and control board before assuming the new igniter is defective.