How to clean igniter on Mode N-0751M-DV
On occasion there is a muffled (gas being ignited) sound when the water heater is ignited. I suspect there is carbon build up on the igniter. or gas pipe. I need to know how to remove the carbon.
Water Heaters - Noritz
Answers & Comments
This is a Noritz Tankless.
That whoosh is excess gas being ignited behind the normal lead/lag time for G-Valve opening and igniter on. Might be the Igniter but you'll need a new igniter gasket as if you pull the igniter assembly and clean ONLY WITH A GREEN SCOTCHGUARD PAD, you'll shred the gasket and need a new one. NEVER sandpaper an igniter it is coated and sanding destroys it.
Also may be a flowmeter signal problem where flow is sensed but ignition signal is slow to igniter but on-time to gas valve opening resulting in excessive gas pocketing in HE before a clean ignition.
I'd say Tech Service Issue as this gas can pocket in the extreme enough to blow the unit off the wall with a late or slow ignition spark.