Gas valve test, 24 vac to gas valve – A.O. Smith 960 through 967 User Manual
Page 33
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BTH S E R V I C E H A N D B O O K
T R O U B L E S H O O T I N G
GAS VALVE TEST
STEP 12
24 VAC TO GAS VALVE
STEP 12: CHECK FOR 24 VAC TO GAS VALVE DURING TRIAL FOR IGNITION.
Condition:
• All wires are reconnected.
• On/Off switch is on.
• Call for heat is activated.
• Perform test at end of ignitor warm up period.
Touch meter probes to wiring terminals on gas valve with wires from control board still connected
during the ignitor warm up period.
IF...
AND
THEN
24 VAC is not present to gas valve
replace control board if Step 9A and 9B have
been performed and results were successful.
24 VAC is present
gas does not flow to burner
check for/restore supply gas;
check for/clear any restriction in the gas train;
replace the gas valve if the valve will not open
with 24 VAC applied.
24 VAC is present
gas does flow to burner
continue to Step 13.
Technical Training Department
TC-044 Revision 6
32
A. O. Smith Water Products Co.
Ashland City, Tennessee © 2004