Flue pressure switch open time longer than 60 minutes.
1. Check that no obstructions are in the flue discharge/air intake line. If ther’is an obstruction, it must be removed.
2. Check the fl ue pressure switch setting point, setting is 4.5 in.W.C. If the fl ue pressure switch is not correctly set, it must be replaced.
3. Check that the electrical resistance of the flue gas sensor corresponds. If the flue sensor resistance does not correspond, it must be replaced.
4. Check that the electrical connection cables between the flue pressure switch, the flue sensor and the power control board. If the electrical circuit is damaged, it must be repaired.
If the previous four cases do not apply, replace the power control board.
