I have a 13 year old Coleman nat gas furnace with a two stage gas valve and igniter, not a pilot light. I've only owned this house for 4 months but the service records on this furnace seem to suggest the flame rod cause problems once a year and service people are called out in march/april/may to clean the rod after a cold Canadian winter.
Basically the 1st stage of the valve, a low stage kicks in and ignites and it seems to take 7 seconds to kick into the high stage. Once the high stage kicks in, furnace shuts down. Seems this flame rod is a safety device that shuts the solenoid on the valve down. I watched the repair guy take the rod out and clean it, although he seemed to think the valve had unspecified issues, his back-up idea was the rod was car boned up so he cleaned it. He did not read the servicing reports from the prior owners as they are not posted on the furnace. The furnace has been fine since that rod was cleaned. The serviceman I used is different company from the old owners.
Is this rod something I can take out myself and clean periodically? Or is this space age-metal that only a qualified tech can touch. Looks fragile, but it gets serviced every year. No I don't plan on touching the valve or anything else!!!! The rod only sends a signal to shut the valve when it falsely detects improper flame (can't detect much right when you are carbonned up)
BTW burners are clean and air flow for the flame is great. Dunno why the rod is so fickle when it fires up. We need the furnace for 7 months to 8 months a year.