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9. Turn the triac housing over (as shown below),
then lift the tab up and slide the triac to the left
and out of the housing.
Tab
Check for 24 VAC on the drive board at CN104
between pin 1 and pin 2.
(Continued next page)
Note:
When installing the triac assembly, insert
the right side of the heat sink into the slot in the air
plenum before replacing the 2 Phillips-head screws.
CN104
Pin 1
Pin 2
Drive Board
The drive board contains all of the circuits and logic,
which control the relays for the heater, compressor,
and fan motors. The only components on the board
that are replaceable are the fuses. None of the
relays and other electronic components mounted
on the circuit board are replaceable in the
fi
eld. If a
component on the board (except for fuses FU101,
FU102, FU103, FU104, and FU105) malfunctions, the
board must be replaced as a complete assembly.