Honeywell Piezo igniter Q635A1002B

Manufactured by Honeywell, this ignition component (SKU Q635A1002B) is a manual/single-channel piezo igniter designed for front-panel mounting on a boiler or heat generator. It is operated by a push-button that mechanically impacts a piezoelectric element, generating a spark through a spark cable. The device requires no wiring and is supplied with a mounting bracket. It functions as a manual ignition device.

Piezo igniters of this kind are selected by matching the original part number and the geometry of the mounting bracket. Check the mounting thread size, electrode length, and shaft configuration against the original component before ordering. The bracket must align with the existing mounting holes on the boiler casing or door. Set the spark gap between the electrode and the pilot burner to the original specification; a gap that is too wide or too narrow can prevent ignition. Route the push-button and spark cable without sharp bends to avoid insulation damage.

Typical failure modes include the absence of a characteristic blue spark when the push-button is pressed. A quieter or absent click inside the housing may indicate a failed piezoelectric element. Cracks or deformation of the housing, or damage to the insulation of the high-voltage wire, are also signs of malfunction. If the pilot burner fails to light, inspect these components for damage.