Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner
My furnace is intermittent. The thermostat "clicks" telling the furnace to come on. Then the induction motor will come on for 10-15 seconds and then just goes out. After some resets the furnace will come on and light off normally and run just fine - until the next time. Often we will wake up or come home to find out the the furnace has not come on. We reset it and usually it will come on, but occassionally it will again turn on the induction motor for a few seconds and then shut down. The tech has looked at it twice and can't figure it out. Thinks it might be the burner control unit. Filter clean, no codes available (this system doesn't have it). Hunter thermostat.
There is a small tube that comes off the inducer for cracks or water. If there are cracks then the pressure switch that it is attached to may not be closing all of the time. Also sometimes you can get water in that tubing which will also cause the pressure switch to not close. If thats the case shorten the tube so there is no low droop in it where water can collect. Another thing that I would do is disconnect the tube at the indicer, take a straightened out paper clip or stiff wire and poke it in the nipple on the inducer to make sure it is clear too. Let me know if any of these work. There may be other things we can do.
Posted on Jan 19, 2009
On my carrier Model 585SXA100-J6 furnace, the gas pressure must be adjusted about once a year or else the pilot goes out. If you remove only the top service door on the furnace and look through the peep hole as the furnace starts, you can see if the pilot lights. If the pilot does not light,or does not stay on, the furnace will run a blower to vent the gas from the combustion chamber, which is why the furnace appears to run for a few minutes after a failure to ignite. In some cities gas pressure varies with the season and with demand. If the pilot does not stay on, a service person can adjust the pressure by turning (slightly) the larger of two slotted screw adjustments near the gas shut off valve that is in the furnace. The goal is a pure blue flame.
In the lower part of the compartment that is revealed when you remove the top service door is some PVC plumbing and a small tube that runs down through the front and bottom of this compartment. This tube must not become clogged. If it does, water builds up in the air intake plumbing. My furnace is old enough so that some plumbing in this area leaks even with the tube free of obstruction. Check for water in this area. To me, it looks as if considerable disassembly is required to fix this plumbing, so I'm going to call the pros. One main leak is from a seam in the black plastic chamber that hooks to the PVC air inlet. The symptom that seems to be associated with this problem for my furnace is that it runs fine for about 10 minutes but shuts off too soon.
Posted on Feb 02, 2009
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Posted on Jan 02, 2017
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