A genuine OEM spark-ignition (piezo) switch for Thetford manual 3-way absorption refrigerators. Designed to send the ignition spark to light the gas burner safely and reliably in models N304, N404, N504, N604.

For safe operation of your 3-way fridge, a correctly working ignitor is essential. If the spark is weak or doesn’t reach the burner, gas won’t light. This part gives you the correct spark path and voltage required.

OEM Part Number: 633998  (replaces 61645622 )

Also referenced as: 700-03849

Kit Includes: 1 × genuine Thetford piezo ignitor assembly (button + internal piezo mechanism)

Compatibility:

• Fits manual 3-way Thetford absorption refrigerators: N304, N404, N504, N604 series

• Replaces ignitor parts in these models where the manual spark push button is used

Frequently Asked Questions

Q: How do I know if my fridge needs this ignitor?
Check if your fridge is one of the N304/N404/N504/N604 models and uses a manual spark-push button to light the gas burner. If the spark button fails (no spark, weak spark, needs multiple presses), or if the ignitor tip is damaged or disconnected, you need this part.

Q: Will this fix all ignition problems?
It will resolve issues caused by a faulty ignitor (button mechanism, no spark). However, ignition failures can also be caused by wiring faults, burner contacts, or misalignment.

Q: Can I test the ignitor before replacing it?
Yes. With the gas off, press the ignitor and observe where the spark jumps