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Posted by Bubba on October 30, 2007, 8:42 pm
>Hi! I have a problem w/my Carrier Weathermaker 9000? (it's a 58MXA)
>not heating.
>
>Though the "component test" checks out OK, this is the ONLY time that
>I see that I see the HSI energized (the ignitor). Also, the test of
>the pressure switch in the op's manual (i.e., disconnect the inducer
>motor, call for heat, and make sure that the HSI is NOT glowing after
>about a minute) was fine.
>
>I see a steady ~26VAC signal to the pressure switch.
That's a little high. You shouldn't see over 23.9v
>
>Other checks:
>
> - air intake/exhaust not clogged (good flow when inducer runs)
> - inducer motor supply voltage fine (>120VAC)
> - inducer cap fine (3.0 uF and resistance huge @ DC)
huge resistance? That could be a problem. You need little resistance.
Install a little resistor.
> - install was years ago so PVC sizing must be right
Yep, if it was installed that long ago, its just GOTTA be right!
> - no backup of water in the drain system
> - no clogging of the other rubber/plastic tubing (from the pressure
>switch to the burner box)
>
>So am I at a point where the board is in question or might it still be
>the pressure switch?
I would definitely replace the board. Its gotta be bad.
>
>I've tried shorting across the terminals, but an HVAC tech has
>informed me that not doing it at the proper time or with the
>connections previously ok (i.e., apparently you can't just disconnect
>the leads and short the terminals) won't show the proper behavior.
>
Have you tried shorting across R and C for 35 seconds?
>???
>HELP!
>
>Thanks
Bubba
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