AdvantagePlus Fault Tree Troubleshooting
1706.doc
3
ECO/VENT SWITCH; Water in tank is too hot or vent gas is too hot or low water cut off switch has tripped
Explanation: This LED monitors the ECO loop in the tank
water, the low water cut off switch and the vent over
temperature switch. LED is ON when all three of these safety
devices are normal. The loop is electrically closed.
At a minimum, check the following:
1. Water temperature
2. Vent temperature at exhaust coupling
3. Low water level in tank
Follow this process in sequence: Recycle power to
the water heater. If the blower does not come on, go to step #1; if the blower is does come on, go
to step #2.
Unit appears to be fine. Recycle power and try again.
Is there 24 VAC from
the transformer to the
board?
Yes
No
Replace transformer
Measure for 24 VAC at the blue and yellow wires of CN4
Reset over temp switch. Check venting for signs of heat damage. Monitor unit for poor combustion.
1. Is the vent over
temperature switch
tripped? (Vent temp
switch is normally
closed. When the vent
reaches @ 180
0
F, the
switch will open
.)
Yes
o
Continue to next step
Remove the two wires on the vent switch. Verify continuity thru two
terminals at the vent temp switch on the exhaust. Press red button
to force manual reset if there is no continuity.
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