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Servicing should only be performed by a Qualied Service Technician
STEP 2: TEST FOR 24VAC BETWEEN BLACK AND ORANGE ON DAMPER PC
BOARD
IF THEN
24VAC is present - damper NOT opening • Check Service Switch Position. Replace Damper
Assembly.
24VAC is not present. • Check Wiring Harness to Thermostat.
24VAC present - Damper Opens • Continue to Step 3.
CONDITION:
• Damper rotates continuously.
STEP 3: TEST THE THREE AMP FUSE
CONDITION:
• Test via the terminals on the head of the fuse or by removing the fuse and testing across the blades.
• Verify that there is 120 VAC to the thermostat. Once veried set the meter to check for continuity and
perform the checks shown in gure below and on next page.
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