Shutting down after 2-3 hours on higher setting

[gymrat0663]

I've researched many of the threads concerning issues such as this on this forum. The Bosca Spirit 500 has four settings. I do not use settings one (stove doesn't run well on this setting) and four (setting not to be used for more than 30 minutes). I use setting two 75% of the time and setting three the other 25% of the time when temps hit the low 20's or colder.

About a week ago, when the stove was switched to setting 3, it would shut down after about 3 hours. Here is a list of all that I've done in the last week:

1. Convection blower removed and cleaned
2. Combustion blower removed and cleaned
3. Stove deep cleaned to include exchanger tubes and venting
4. Door seals checked - OK
5. Burn pot seal checked - OK
6. OAK hose removed and cleaned
7. Vacuum hose checked for blockage - OK

The only thing that caught my attention in completing all of these things was the convection blower had quite a large dust hairball on the fins of the fan. I was convinced that was my problem as that would reduce the amount of airflow considerably. However, I still have the same issue after cleaning the blower.

Have a I missed cleaning something? Is my high limit switch beginning to go bad? I should add that the stove runs great on setting 2.

Thank you for any input you may have.

 

[Bkins]

Does the stove restart after it cools down and do you have to do anything to get it to restart, or is it down?

It sounds like a high tempature switch is cutting out and then resetting itself if the stove starts normally after it cools down. I am not familiar with your stove but look for a disc switch that should be shown in your manual for the stove. Probably under the electrical schematics section. You can jumper this switch to see if your stove will continue running past your 3 hour period but be very, very carefull doing this as its your main overheat protection for your stove. If you do this you should stay with the stove until you make a decision if the switch is the problem. Make sure if you do this to unplug the stove prior to working on it and to make sure the jumper wire leads and connections are protected from shorting out on anything. I would probably just put in a new switch as they are cheap enough and you won't need to sit and watch over the stove for a extended period of time.

 

[gymrat0663]

Thanks for the reply Bkins. The stove restarts after it cools down without having to do anything, but hit the power switch.