Question about Heating & Cooling
We jumped every swithch and did continuity checks on all swithches all tested good.
Check polarity to the furnace, it must be correct, not likely unless new or worked on though. The induced draft has a pressure switch that has a tube that connects to the induced draft housing, that orifice clogs with carbon and a tiny drill bit is used to **** the orifice clean, it will be hard if pluged, you know you are clear when you fel,hear the inducers squirrel cage with the drill bit, the tubing if dipped can collect condensate and block the pressure of the draft to be sensed by the pressure switch and the pressure switch can be bad or off too. If the flue is blocked or induced draft wheels burned up/rusted out, not much draft is induced, you need to snoop a bit.
Posted on Oct 31, 2012
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Posted on Jan 02, 2017
SOURCE: furnace short cycles
turn electric off to heater, there should be a light switch on the side of the heater that cuts electric off to the heater. find the flame sensor, unplug wire to it and remove from heater being careful not to touch it with your hands or fingers, because of the oils in our skin. you can touch the part that the wire plugs to. when you get it out take fine emery cloth and clean the probe side or the sensor side real good and reinstall it. plug the wire back in and try heater. it should work fine. the sensors sole purpose is to detect flame and when it gets dirty with carbon it cant. so the sensor false reads and tells the heater its shooting raw gas into the heater and the heater shuts down, or short cycles, its there incase the ignighter fails. hope this helps you. it cost me 105.00 for this info. write it down in your owners manual so you dont forget it. the symptoms and the cure.
Posted on Jan 27, 2009
time to call service guy you are cycling on a saftey which means somethings not right in ignition circuit the only thing i would tell a untrained person to try is cleaning the flame rod which is part of the pilot assembly it is a metal rod that gives small electric current to ignition device confirming that you have a pilot lite you can lightly sand with sand cloth
Posted on Apr 15, 2009
Check for 24 volts across the two terminals on the gas valve when the ignitor glows. If yes, bad gas valve or blockage in the gas train. If no, bad ignitor or circuit board. Even if the ignitor glows, it still may be bad and not sending the proper signal to the board. If you jump the R and G terminals on the circuit board, does the fan still only run for 90 seconds? If so I would say replace the board.
Posted on Dec 28, 2009
There may be more than 1 limit switch. Look at the wiring diagram and follow it to all switches. Or jump out the complete circuit.
Posted on Jan 21, 2010
You are on the right track. I would suggest you change the sensor though as if it has failed it would be one of the reasons why it is shutting down the way it is as it cannot detect the flame and is closing the solenoid.
Hope this helps,
Posted on Nov 26, 2010
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