Posted by 2510Paul on January 31, 2019 at 10:27:36 from (72.160.248.225):
Earlier I reported we had no heat. See below in posts. Thanks for all the responses. Here's the rest of the story.
1. XV95 Trane Furnace, TUH, UH wiring diagram. 2. No Flame, house fan ran great. 3. Found Flashing Red LED, Four Flashes and then Pause, Manual says Open Temperature Limit Switch.
4. But which Switch, I can find three of them in the wiring diagram. Two are in Series. All have yellow wires. a.XV95 Furnace High Temperature Limit Switch Open on Rise TCO-A - Paint b.XV95 Furnace Inducer Temperature Limit Switch, Open on Rise TCO-B - Paint c.XV95 Furnace Manual Reset Flame Rollout Temperature Switch, Open on Rise - Paint
5. Started looking at U-Tube Videos. 6. About this time the furnace guy arrives. From what I had he knew instantly where to look. 7. The 4c switch is open and he manually resets it. The furnace takes off.
8. He monitored it for some time but could find no issue. The Burner Box remained cool. The 4c switch is also called the Burner Box Temperature Limit Device. "It is located on the bottom of the burner box. The vent and combustion air inlet terminations (2" PVC pipe) should be checked for blockage." Again, this switch has a manual reset.
In hindsight I checked the exhaust and vent pipes first early this morning. The exhaust had some icicles but really no blockage. The vent had a bunch of ice crystals at the inlet of the pipe reducing the hole to maybe penny or quarter size, I was at a bad angle to see. Maybe it was worse than I thought.
When the Technician arrived he said for these temperatures it is really quite humid out so I am going with a blocked inlet vent.
Here are pictures of the switches in the order of 4a, 4b, and 4c.
The Burner Box is just above 4c and just above that is where the Vent Pipe comes in. Sorry, I did not get a picture of that.
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