Sime Ignition/Ionisation Electrode 6221673

The Sime 6221673 is an ignition and ionisation electrode supplied with its connecting lead. It is used on the Sime Murelle ONE HE 25 boiler, where it provides the spark for burner ignition and senses flame presence to confirm the burner has lit. The combined ignition and ionisation function means one electrode assembly handles both duties on this appliance.

• The boiler attempts to fire but there is no spark at the burner.
• The burner lights and then goes out, or the boiler locks out shortly after ignition.
• Ignition is intermittent, with repeated failed start attempts before the boiler fires.
• The electrode tip is visibly eroded, bridged with debris, or the ceramic insulator is cracked.
• The lead or its connector shows heat damage, brittleness or a poor connection.

• Confirm the appliance model is the Murelle ONE HE 25.
• Check the GC number on the boiler data badge against the fitment listed above.
• Inspect the existing electrode and lead routing so the replacement can be fitted the same way.
• Verify the part number 6221673 on the existing component where it is legible.