State Water Heaters Utra-Force STC-077, Service Handbook

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S U F 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
Technical Training Department State Water Heaters
STC-077
30
Ashland City, Tennessee © 2004
GAS VALVE TEST
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.
STEP 12
24 VAC TO GAS VALVE
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.
SUF 240 ONLY