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We have 2 XE90 propane units in the house. Although the thermostat is set on 'Off' vs. 'Heat' or 'Cool' and fan is on 'Auto', the fan runs constantly and the vent pipe from the furnace to the outside is also blowing air. The sight glass on the furnace shows a red light blinking 5 times every few...

2 XE90s converted to propane were installed in my home in 1998, one in the attic the other in the basement. They have never failed or been serviced. While replacing the filter this season, I noticed that each of them has a red light flashing once per second in the side panel sight glass. I...