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Janitrol furnace, Model # GMT090-3, built in February of '02. The induced draft motor runs for a half second, then quits. Indicator light blinks rapidly and continuously, indicating 'incorrect twinning' or 'incorret polarity' and telling me to reverse the transformer secondary or primary wires. I have done both with no improvement. There is power to the inducer motor, which turns easily. There is no water damage. I followed this instruction given to someone else: 'hook a meter to the 2 wires from the control board going to the inducer motor. Put your meter on AC voltage of about 200. Watch the meter, see if the voltage stays or drops out. If it stays at about 110, you have a bad inducer blower motor. If it drops out, bad board' - with the result of the voltage dropping out. I have no problem with buying and installing a new board, if I have reasonable confidence that this is the problem. Can anyone tell me how accurate this is?

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I ran into a simalar problem and it was a short in the control wiring of the furnace. When there is a call for heat a relay closes to start the inducer the movement of air causes by the inducer closes the air pressure switch. This is where the problem starts.some where in the control wiring there is a dead short this causes the secondary (24volts ) to drop causing the inducer relay to open shutiing off the inducer which in turn opens the pressure switch removing the short and the cycle starts over again. The culprit in my case was the high limit switch which was shorting against the metal furnace housing. You can easily ccheck this by removing the two wires from the fan limit switch and powering up the unit to see if the inducer runs normally . If it does remove limit and replace if necessary.
hope this helps

Posted on Dec 03, 2013

Testimonial: "Thank you for taking time for me. I did replace the control board, and the furnace runs fine now."

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Not having a make or model number, I can only give you generic information. However if you add more info, others and myself can give you a better diagnosis.

 

In order for a furnace to start that has an inducer motor, the thermostat must call for heat. Then the circuit board will flash rapidly. There should be power from the board up to the inducer motor. If there is too much resistance, the blower motor or pressure switch(s) will shut down the unit. I would suggest that if you can spin the inducer motor by hand, check for resistance. It may be frozen up or there may be water in the housing not allowing the blower to turn. Check for a plugged water drain at the bottom of the blower housing and make sure it drains. If the inducer blower does not even try to start, you will need to check for voltage from the circuit board. Not knowing for what you have for a model, I am unable to tell you if you should be checking for AC or DC voltage.

 

Get back to us as soon as you can with more info.

 

Thank you for your patience.

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