GF - D 23
Gas Valves
Modulating & three stage gas valve
solenoid check
Figure 52
Introduction
If a call for heat is present and the furnace enters a
trial for ignition, the furnace control board will energize
the gas valve 24 volt solenoid via the 15 pin plug located
at the lower left side of the control board (Figure 51).
If the gas valve does not energize, or the burners do
not light, perform the following checks:
Pre-check
Step 1
Check for proper inlet gas pressure is present to the
furnace.
Step 2
Make sure pressure hoses to the gas valve are
configured properly and secured in position (Figure
52).
Solenoid check
Step 1
Hook up a gas pressure manometer to check for
manifold pressure during the test.
Figure 51
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