Original message
| danl
 |  "Coleman Furnace"
, posted Mon 21 Jan 21:56  
Was working on a three year old coleman mobile home furnace today. Customer said it was 62 degrees in house this morning. When I got there it was running good but was flashing 3 times meaning pressure switch stuck closed. I cycled it off & took a continuity reading on switch. It was not closed. Think the board is going out on this? I appreciate the replies
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Replies:
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| static
| "Re(1):Coleman Furnace" , posted Mon 21 Jan 22:20
That is the $64 question!
I see this problem on these LOTS.
Look on the control board, there is a cluster of large blue resistors in the upper left hand corner. If there's NOT a large burn mark around those, I'd replace the pressure switch. If there IS a large burn mark, I'd replace the pressure switch and recommend a new board. Then if it fails again...they should have took your advice.
The pressure switches those take are little pieces of junk.
I haven't been able to figure out yet, whether the pressure switch going bad creates the burn mark, or if the board creates the burn mark on it's own and then starts dropping out the pressure switch.
Oh by the way...I'm sure you checked that "inducer" motor and the roof jack for blockage before you considered replacement parts...right? ;)
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| | danl
| "Re(2):Coleman Furnace" , posted Mon 21 Jan 23:15
Thanks for the reply. I'll be back tomorrow to check everything you said. I didn't think to check the inducer & roof jack for blockage. I should have done that.
I don't see the newer coleman furnaces too much. Is there an easy way to get the inducer motor out? It looks like the screws in the back of the motor are right up against the cabinet.
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| | static
| "Re(3):Coleman Furnace" , posted Mon 21 Jan 23:58:
That housing the motor is in will spin around, if you give it a good stout twist to where the black plastic cover is facing you. Then you can take the cover off and look in there. The motor itself doesn't come out so easy, you'd have to drop the burner assembly and take the fresh air pipe loose. I wouldn't go to all that trouble unless you decide you need to.
edit: well, if it's saying it's stucked CLOSED , I guess there probably wouldn't likely be a problem with the motor or jack. My bad, I was thinking about stuck open.
[this message was edited by static on Tue 22 Jan 00:10] |
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