GF - D 24
Gas Valves
Figure 53
Step 2
Start another call for heat cycle and remove the 24
volt connector plug at the gas valve (Figure 53).
Step 3
Check for 24 volts at the plug when the furnace control
calls for gas valve operation (after the control has
successfully completed the igniter warm-up period)
(Figure 54). If 24 volts is present, yet the gas valve
does not open when the plug is connected to the gas
valve, replace the gas valve.
Step 4
If 24 volts is not present at the plug , recycle power
to the furnace and call for heat again. Check for 24
volts between pins 11 and 13 of the 15 pin plug on the
furnace control board (Figure 55). If voltage is present,
the wiring between the furnace control and the gas
valve has a open circuit. Inspect the wiring and correct
the problem.
Figure 54
Figure 55
If voltage is not present between pins 11 and 13 of the
15 pin plug, replace the furnace control.
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