Hello everyone. Our pellet stove has been acting up since last fall after we had the stove serviced and cleaned. When we start the stove (typically level 3) the stove starts, pellets ignite, but about 10-15 minutes in an error shows. To further complicate matters, it usually switches between two different error codes: ignition failure and proof of fire snap switch shuts insert down codes. Any ideas what could cause this? We have previously replaced the proof of fire snap switch and have reset it multiple times since this problem started.