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SUF SERVICE HANDBOOK
TROUBLESHOOTING
State Water Heaters Technical Training Department
Ashland City, Tennessee © 2004
21 STC-077
ECO CHECK
STEP 4: CHECK FOR 24 VAC BETWEEN PIN 4 ON CONTROL BOARD TERMINAL CN3 AND
GROUND.
Condition:
• Disconnect CN3 plug from control board.
• On/Off switch is on.
Check for 24 VAC between pin 4 of the CN3 terminal on the control board and ground.
STEP 4 24 VAC TO ECO
IF… THEN
24 VAC is not present
replace the control board if Steps 1, 2, and 3 have been performed and the results
were successful.
24 VAC is present continue to Step 5.