Enviro M55 FPI

[Todd-Willis]

Our Enviro M55 FPI started acting up two seasons ago. The stove would startup normally, the turn itself off after a normal startup and display a flashing #3. The convection fan did not come on. By resetting, tuning off and back on, the stove would continue normally until the next start cycle. This year it does the same, but resetting does not result in operation, it only shuts down.
I have replaced the exhaust temperature sensor (proof of flame), checked wiring connections and still have the same issue. I don't want to throw parts at this. Any advice would be much appreciated.

 

[johneh]

Remove and clean the Exhaust temperature switch. Make sure the hole is free of ash
Ash is an excellent insulator, which can cause the switch not to reach 120 degrees on startup.
causing the control board to see no fire, and the stove shuts down. eg 3 flash code.
Switch is located slightly above and to the left of the combustion fan. Should be 2 brown wires attached.
Welcome to the forum

 

[Todd-Willis]

Thank you. I replaced this sensor about two weeks ago., but still have the same problem.

 

[kchace]

I had what may be a similar condition on my M55. It would take so long to light and get up to temp that it was timing out. From a cold start, use a flashlight to watch exactly what’s happening in the burn pot. Under most circumstances you should have a small flame within 5 minutes or sooner. But that flame also has to get big enough to warm up the exhaust enough for the exhaust temp sensor to be satisfied that the stove is lit - all within about 15 minutes. Otherwise, the startup sequence will time out and the stove will set the no flame error condition.

If this is what is happening (timing out) there are a few things you can check.
1. Too much air can cause this. Check that the main air damper on the left side is not open too much
2. The air pump may have failed - the small air pump provides a flow of air through the Ignitor and is critical to start up.
4. Make sure the cavity behind the grate between the grate and the Ignitor opening is very clean. Also, if the metal “bar” on the back of the grate and directly in front of the Ignitor has burned away this can definitely increase the ignition time.
5. Old or damp pellets can also definitely increase the start up time.

Hope this helps.
Ken

 

[Ssyko]

Thank you. I replaced this sensor about two weeks ago., but still have the same problem.

How is the exhaust vent installed? Do you have access to the cap outside? Inspect the cap area for obstructions, pull the vac tubing from the vac switch, open door about 4-6 inches hook up a vac/leaf blower to the cap end of the vent and pull the ash out of the stove.

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