If you do have propane does the burner try to ignite or is just the air circulation fan running. Remember in the sequence the air circulation starts first and then the burner should try to ignite so long as the sail switch has been moved by the air circulation. My heater in my Arctic Fox had intermitant problems which were resolved after I replaced the mother board.
I am sure others will give you more ideas to help resolve your problems.
Tom Marty
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