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SUF SERVICE HANDBOOK
TROUBLESHOOTING
State Water Heaters Technical Training Department
Ashland City, Tennessee © 2004
19 STC-077
TRANSFORMER
STEP 2: CHECK FOR 120 VAC TO TRANSFORMER FROM PIN 1 AND 2 ON CONTROL
BOARD CN4 TERMINAL.
Condition:
• Disconnect CN4 plug from control board.
• On/Off switch is on.
Check for 120 VAC between pin 1 and 2 at CN4 on the control board as illustrated above. Perform
this test with the CN4 plug disconnected and the On/Off switch turned on.
STEP 2 120 VAC TO TRANSFORMER
IF… THEN
120 VAC is not present
check CN1 plug connection
replace control board if Step 1 has been performed and results were successful.
120 VAC is present reconnect CN4 plug to control board, continue to Step 3.