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Verify connections for sensors are
plugged in and connected properly
Start Here
Turn system switch on comfort control
to OFF and fan to ON position
Does voltage(s) measured correspond
to return air temperature?
Yes, EVC is good
Wait 10 minutes
Verify resistance per
Thermal Resistance Table
and Voltage table.
Sensors are good.
No, replace EVC
Sensor Check
Measure return air temperature
No, remove J3 connector
and measure VDC
17
Measure VDC at J3 connector on EVC.
(See EVC table for J3 location)
Is VDC between 4.5 – 5?
AM7A0C36H31-SF-1A
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