Enviro M55 Convection fan coming on late...?

Other than an extra Fall cleaning and a new door gasket. My Convection fan is now taking quite along time to start, about 5 plus minutes to start up. I hit the wall T-stat, Pellets fall and in about 75-90 seconds I have a flame. Usually after another 2 minutes approximately, I have a medium sized flame (for the M55) and the Convection fan comes on normally. As long as the T-stat is calling for heat, the flame size continues to get very large as most M55 owners can attest to. But now, a good 5-6 minutes goes by with the largest flame possible, roaring away before the fan finally comes on.
Late summer, chimney pipe and cleanout done by the same company I have used the past five years.
Have used the stove half a dozen times this fall, ran perfectly.
Current problem started two days ago after I replaced the door gasket. I just noticed that one corner of the gasket closet to the lower door hinge is really pushed in compared to the rest of the gasket. (I bet it will fail the dollar bill test) Could that be the problem, sucking in air and changing the internal temperature?
Thanks, Bill

 

Sounds like a dirty proof of fire sensor. But do something about any gaskets anyway.

 

Or a snap disk, if the stove uses them, not seated correctly.

 

Those are sensors Steve.

 

Yes, it is a Sensor, 120 degree. I’ll check it out but I actually cleaned it a year ago and it didn’t have much of any hardened buildup on it. I still wonder if I have an air leak on the corner of the gasket....Wouldn’t that cause a temp change which woul delay the sensor from kicking in...?
Bill

 

Technically, they are thermostats

 

Like Smokey said, could be dirty, out of place, wire is partially off, etc......

 

Gaskets can do strange things a light dust build up makes the sensor read cold as does a ridge of ash around the snap disc. I can pull error #3 lights on a ridge around part of my proof of fire sensors.

 

Which is a temperature sensing device that acts at a particular set temperature.

 

Thanks SmokeyTheBear & slvrbllk
It was the 120 degree sensor. Had a good 1/16 carbonized build up....cleaned off and now the combustion fan comes on normally. Fixed the gasket as well. All is good Bill

 

Nice fix! I have that stove, just in a different flavor. Where is the sensor located? I'm doing a cleaning this weekend and might as well at it to the list. It's the annual preseason "Get the service rails out" deep clean.

 

Also curious!!

 

Skier76
When you pull your stove out/rails...
On the left side, if you look to the right of the Combustion fan, on the actual side of the stove.
You will see an approx 3 inch plate with a screw in each corner.....you DON’T need to remove the plate necessarily. But in the center attached to the two wires is the 120 degree sensor. Just unscrew and disconnect the wires and pull out an clean. Mine had a 1/8” crusty build up that scraped right off. But if you want to do a more thorough clean of the area inside the sensor area you will need a new gasket. I wii probably do it when we have a January thaw! Hope this helps!
Bill

 

Also to eatonpcat

 

Thanks, I have seen the sensor, didn't know what it was. I tried to remove it a couple times to check it out, bot I couldn't get it loose and gave up.

 

Quitter

 

Part #3 in the manual page 31 list and page 34 exploded parts diagram. It, like on my bucket of parts, is a ceramic snap disc. Time to unload the dryer.

 

Many thanks Bill! I'll let you know how it goes. Hope to have it out on the rails this weekend. Logic would dictate doing this during a time when it's not cold out and the stove isn't needed. But I picked the coldest weekend since last winter. Go figure.