I had this trouble 2 years ago. . . . Air, blower work fine, when I turn on "Heat" it clicks a couple of quick times and wont start up the furnace. The system is only 5 years old .( i believe it was installed in july of 2004 , furnace, a/c lennox)
I've replace batteries and "reset" several time thinking the batteries were too low to start it up.
The thermostat was replace 2 years ago and now its doing it again. Any suggestions other than having to get them back out here would be helpful. Thank you .
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