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What is the brand and model number of your furnace?
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Can you give me the complete model number on the furnace? It will be on a label on inside furnace panel just above burners.Remove panel to burner compartment and look inside. The model number will help me give accurate assistance for your specific unit.
Below is a link showing where to find label with model number:
If furnace is not coming on, there should be an error light flashing on the control board in blower compartment to indicate what has failed. If you can locate this and tell me the pattern of the flash, that will point us in the right direction for troubleshooting.
Also let me know if you have a multi meter for troubleshooting.WE will go from here.
When furnace fails what is the error light doing?
When it fails we should get a code indicated by short and long blinks, EX 1 short and 3 longs indicates an open limit
Is light solid?
OPen cover. Hold door switch down and watch light
Pattern of flash? (Example 1 short, 2 long etc)
Yes pattern will tell us where to start troubleshooting