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Lennox gas furnace G12Q3-110-6 fan timer and relay

Don't know where the wires go on the relay from the timer

Posted by Anonymous on

6 Suggested Answers

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Posted on Jan 02, 2017

hotuna
  • 288 Answers

SOURCE: gas furnace wont stay lite

I'm a little confused by your terminology. You are saying you have a pilot lite and electric heat strips? Are you possibly meaning burners? Is the heater running for 2 hours straight without shutting off? how cold is it there? Lastly what temperature do you have the thermostat set at and how close does it get to the temp. before it shuts off?

Posted on Dec 20, 2007

  • 1 Answer

SOURCE: lennox 80 ugh furnace turns on, ignites gas and shuts off in 2-3

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Posted on Nov 24, 2008

  • 85 Answers

SOURCE: NEED WIRING DIAGRAM FOR WISPER

http://hvacpartsshop.net/G20_Series.pdf This should be what your looking for.

Posted on Dec 09, 2008

  • 85 Answers

SOURCE: Heater no longer works on auto fan, only manual fan

When you call for fan in auto ensure your getting 24 volts at pin on control board, if it is not energizing then there is a problem with the relay.. Before you change out the expensive control board, try the therm..

Posted on Dec 09, 2008

  • 221 Answers

SOURCE: Lennox Fan will not come on when set to ''auto'' position.

Expensive is relative, service calls are never free. But if you have an idea what the problem is, you are armed against an unethical service company. Now to what you describe, could be a couple things, first let me explain the difference in fan speeds. Furnaces that both heat and cool have multi-speed blower motors. High speed is for cooling and lower speeds are for heating. The fan switch at the T-Stat turns on the high speed fan relay. The lower speed fan is turned on by either a temperature activated switch (silver box mounted on front on furnace above burners) or a time delay relay which is solid state. That being said, your problem could be a defective fan switch or one of your blower motor windings has gone bad. Most motors have 3 or 4 speeds and a technician could just change speeds and all would be good. A fan/limit switch is not so expensive that you would replace the unit. Bottom line, unless your really handy, a heating company is in your future. Good luck and please rate my answer if it was helpful to you.  

Posted on Jan 02, 2010

Testimonial: "Thanks. I am not handy when it comes to furnace repairs, however this info will help me when I speak to the tech 1/4. I'll let you know the outcome."

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? 2:44
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Lennox Fan will not come on when set to ''auto'' position.


Expensive is relative, service calls are never free. But if you have an idea what the problem is, you are armed against an unethical service company. Now to what you describe, could be a couple things, first let me explain the difference in fan speeds. Furnaces that both heat and cool have multi-speed blower motors. High speed is for cooling and lower speeds are for heating. The fan switch at the T-Stat turns on the high speed fan relay. The lower speed fan is turned on by either a temperature activated switch (silver box mounted on front on furnace above burners) or a time delay relay which is solid state. That being said, your problem could be a defective fan switch or one of your blower motor windings has gone bad. Most motors have 3 or 4 speeds and a technician could just change speeds and all would be good. A fan/limit switch is not so expensive that you would replace the unit. Bottom line, unless your really handy, a heating company is in your future. Good luck and please rate my answer if it was helpful to you.  

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Heater no longer works on auto fan, only manual fan


When you call for fan in auto ensure your getting 24 volts at pin on control board, if it is not energizing then there is a problem with the relay.. Before you change out the expensive control board, try the therm..

Dec 09, 2008 | Heating & Cooling

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