Troubleshooting; Pre-Service; 120 Vac To Control - State Water Heaters Utra-Force STC-077 Service Handbook

STC-077
CHECK THAT:
• Insure 120 VAC power supply has correct polarity — check neutral
(white) wire to ground with volt meter. It should read "0" volts.
• Tank is full of water
• Exhaust and intake vent do not exceed allowable limits
• All plugs into boards are secure
• Condensate hose is drained and open
• Proper (natural or propane) gas is supplied
SUF SERVICE HANDBOOK
STEP 1 120 VAC TO CONTROL BOARD
STEP 1: CHECK FOR 120 VAC TO CONTROL BOARD CN1 TERMINAL.
Condition:
• Disconnect plug from CN1 terminal.
• On/Off switch is on.
Check for 120 VAC black wire terminal white wire on plug.
IF...
120 VAC is not present
120 VAC is present
Technical Training Department
STC-077
S U F S E R V I C E
T R O U B L E S H O O T I N G

TROUBLESHOOTING

PRE-SERVICE TIPS

120 VAC TO CONTROL

THEN
check On/Off switch, turn switch on, replace On/Off switch if defective, restore
power to the water heater.
reconnect CN1 plug, continue to Step 2.
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H A N D B O O K
State Water Heaters
Ashland City, Tennessee © 2004