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Old 11-29-2010, 11:14 PM   #1
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Our Lennox G24M4/5X fails to ignite


Our Lennox G24M4/5X fails to ignite. Thermostat is operational, & activates the combustion air blower; also changes the blink pattern of the LED; When Thermostat is off, LED blinks constantly on/off. Once Thermostat is turned on LED blinks 4 times then shuts off, this repeats every 5 seconds. Manual fails to provide diagnosis for 4 blink LED fault message. Suggestions appreciated.

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Old 11-29-2010, 11:21 PM   #2
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Our Lennox G24M4/5X fails to ignite


4 flash is typically high temp limit, have you replaced filter, opened all register, check evap coil for being plugged

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Last edited by hvactech126; 11-29-2010 at 11:23 PM.
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