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SUF SERVICE HANDBOOK
TROUBLESHOOTING
Technical Training Department State Water Heaters
STC-077
22 Ashland City, Tennessee © 2004
ECO CHECK (CONTINUED)
STEP 5: CHECK FOR 24 VAC BETWEEN PIN 1 ON CN3 PLUG AND GROUND.
Condition:
• Reconnect CN3 plug to control board.
• On/Off switch is on.
Insert one meter probe into the back of CN3 plug pin 1, check for 24 VAC between here and ground
with CN3 plugged in and power on. (See illustration above for pin number locations.)
STEP 5 24 VAC FROM ECO
IF… THEN
24 VAC is not present
make sure water temperature in tank is below 160° F, press Set/Reset button on
display panel, replace upper temperature/ECO probe if tank water temperature is
below 160 and Step 4 has been performed and results were successful.
24 VAC is present continue to Step 6.