Inducer moter not coming on - http://www.hvacmechanic.com/ Forums
Original message
| Fix it my self
 |  "Inducer moter not coming on"
, posted Tue 4 Mar 17:14  
I have a Comfortator C8MPN. The heater just stop working. I am getting a diag code of 3 on the Smart Gas Valve. Which points to a pressure switch. I replaced it and it still flashes the 3 time. I replaced the inducer motor and it still flashes 3 times. I replaced the Fan timer Control bd and it still flashes 3 times. I have not replaced the Smart Valve (1013350.
I am not sure what in the circuit is causing the inductor moter from coming on. I dont have the schematic for the Fan Timer Control(1014460) nor do I have one for the smart valve.
The AC works fine.
Thanks
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Replies:
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| cubstakeseries
|  "Re(1):Inducer moter not coming on"
, posted Tue 4 Mar 17:57
Are you getting voltage to the inducer?
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| | Fix it my self
|  "Re(2):Inducer moter not coming on"
, posted Tue 4 Mar 19:59:
No there is no voltage going to the Inducer motor I replaced it with a working motor.
I am not sure how the start up works. I know you get a signal from the thermostat W and R then I am not sure the logic it takes to turn on the Inducer motor. Does it take Rollout switch and the Main Limit to be working? If so how do they work? I see a little red button on them it doesnt seem to do anything.
Thanks for any help.
[this message was edited by Fix it my self on Tue 4 Mar 20:00] |
| | Freon
| "Re(3):Inducer moter not coming on" , posted Wed 5 Mar 11:42
Usually the inducer is the very first thing to start when you call for heat at the thermostat. Unless the inducer runs correctly, all subsequent events won't happen.
I would find where the inducer motor connects directly to the furnace control module. Turn off power! Remove the inducer motor connections at the module and test for 120 volts AC directly at the module. If you get zero volts AC with a call for heat, then, as a second test, measure the AC voltage between the W and C terminals on the control module. If you don't get 24 volts AC then the module is not getting the call for heat power and you may have a thermostat wiring issue.
As a last test, disconnect the Smart Valve from the control module and see if the inducer now runs. It's a long shot but Smart Valves seem to be problem areas. I'm not sure how or why it would affect the inducer but it's a simple test.
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