Service recall: no diagnostic charge Pressure switch not closing again Tubing plugged with ice Replaced tubing with a thicker tube and wrapped it in insulation Sealed exhaust outlet of leakage inside the burner cabinet Added a smoke stack exhaust pipe to get the moist exhaust gasses over the top of the unit Feared exhaust was hitting the wall in front of the exhaust outlet and recirculating back into the burner compartment Cost for today is additional material used
