Question about Heating & Cooling
The furnace control diagnostics blinks red 4 times. What can I do to fix it?
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Posted on Jan 02, 2017
open the top of your unit so that you can see into the burner box
what your looking for should be an orange wire that leeads up to a metal rod
that metal rod should be in the way of the flame when unit is on
this is your flame ground,,, or more commonly known as the flame sensor,,, take this out and goive it a good brush with some steel wool
this should clear up you problem
Posted on Nov 04, 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
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