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SUF SERVICE HANDBOOK
TROUBLESHOOTING
Technical Training Department State Water Heaters
STC-077
18 Ashland City, Tennessee © 2004
TROUBLESHOOTING
PRE-SERVICE TIPS
SUF SERVICE HANDBOOK
120 VAC TO CONTROL
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.
STEP 1 120 VAC TO CONTROL BOARD
IF… THEN
120 VAC is not present
check On/Off switch, turn switch on, replace On/Off switch if defective, restore
power to the water heater.
120 VAC is present reconnect CN1 plug, continue to Step 2.
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
STC-077