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My 5+ year old furnace sporadically won't start. After changing the drain hoses to rigid pipe to eliminate traps, blowing out the sensor tubes and checking the exhaust / supply pipe for blockage, the last two times I opened and closed the access panel it worked fine for a week, and then for two days. This time I removed one screw from the panel and it started. Any ideas?..Kevin

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  • Master
  • 899 Answers

Is the module or a sensor , wire near the panel ? Check for loose wire connections , wires on sensors and check the module for bad connections and let me know what you find , sometimes the module can act up too from a bad transformer or just a failing module

Posted on Jan 03, 2014

  • jason Jan 03, 2014

    sorry meant to add , also a failing sensor can cause failure to start up

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SOURCE: I have a Trane Xe-60 furnace about 19 years old.

THIS IS A COMMON PROBLEM WITH THE DOOR SWITCHES, MY FIRST ANSWER WOULD BE REPLACE THE SWITCH SECOND WOULD BE OPEN THE DOOR AND PUSH THE BUTTON IN AND SEE IF THE FURNACE WILL WORK. THIS SWITCH IS JUST A DOOR SAFTEY IF THIS WORKS. I HAVE TAPED A PIECE ON THE INSIDE OF THE DOOR WHERE THE SWITCH WILL HIT THE DOOR ABOUT A 1/4 INCH THICK AND SEE IF THIS WILL GET YOU RUNNING UNTILL YOU CAN GET A SWITCH

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SOURCE: York 92 % eff. furnace shuts down on # 3 error (pressure switch)

i have fixed almost every one of pc9 -----we have installed in our company,code three{flashes} at first new presure switches installed, same thing,york knows about this,induction motor bearings,could be bad.our local york dist, has boards,inducer, ***.motor, dual press.switch,free.as is known as the only way to fix.after all else is ruled out.one local competator called us if we wanted to join class action suit . good luck.furnaces work good at first, season or two then bam

Posted on Dec 04, 2009

Testimonial: "Believe have now pin pointed it to weak inducer motor.Removed outside exhaust vent apparatus with three elbows in it. Put one elbow back on .no more "

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Have your gas supplier verify delivery pressure. Too high or low, the valve will lock up. Should be a free service.

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heatman101
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SOURCE: Furnace won't go on.

Hi,
The pressure switch is not working or there is a bit of water in one of the hoses.
What is happening is that the pressure switch will not close when the inducer fan satrts up. This gives the stuck open reading....
Check all of the hoses and the vent piping for water inside and if that all checks out then replace the pressure switch...these do go bad way to often, but they are a saftey device so they make to to be very sensitive...

Here is a tip that wrote about how to buy heating and air conditioning parts online.

How to find Air Conditioning, Heating and Furnace parts online.


heatman101

Posted on Oct 07, 2010

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