Carrier Weathermaker 8000 help
I have been dealing with an intermittently operating Carrier Weathermaker 8000 for the past several months. From time to time it will stop working, and then usually after several hours of reseting it, it will continue to work fine for several weeks at a time. I have already had a repair company come and look at it, and they told me it was a faulty inducer motor, which I had replaced but the problem persisted. Since then they have been back on 2 other occasions on warranty calls but never actually did anything.
I have given up dealing with them, and have started troubleshooting it myself. When I power it up, the blower motor starts up for 90 seconds, and then the inducer motor should start. However, the inducer motor only briefly turns (I'm gonna guess there is power applied for less than a second) before everything shuts down. I get error message 31 which lists:
PRESSURE, DRAFT SAFEGUARD, OR AUXILIARY LIMIT (when used) SWITCH DID NOT CLOSE OR REOPENED - If open longer than
five minutes, inducer shuts off for 15 minutes before retry. Check for:
- Proper vent sizing and condensate pitch
- Vent Restriction or High winds
- Defective inducer motor or start capacitor
- Low inducer voltage
- Defective pressure switch or connections
- Inadequate combustion air supply
- Disconnected or obstructed pressure tubing
I have checked the pressure switch, and it is working properly. I have also put the furnace into test mode, and the inducer motor starts and runs fine in this mode, along with the blower and the hot surface ignitor. There is no Auxiliary limit switch installed, and the draft safeguard is closed as its supposed to be.
Any tips on what I should try next? I'm reluctant to sink too much money into try to repair it, as its about 16 years old, but I would like to get it working again if possible.
Thanks in Advance,