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SUF SERVICE HANDBOOK
TROUBLESHOOTING
Technical Training Department State Water Heaters
STC-077
20 Ashland City, Tennessee © 2004
TRANSFORMER (CONTINUED)
STEP 3: CHECK FOR 24 VAC AT TRANSFORMER CN4 PLUG ON CONTROL BOARD.
Condition:
• CN4 is plugged into control board.
• On/Off switch is on.
Insert meter probes into back of CN4 plug on pins 3 and 4 (blue and yellow wires) with CN4
plugged in and power on.
STEP 3 24 VAC FROM TRANSFORMER
IF… THEN
24 VAC is not present
replace transformer if Steps 1 and 2 were performed and results were successful.
24 VAC is present continue to Step 4.