GE APH10 Series, Technical Service Manual

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Troubleshooting the operation/smart board:
If the unit is dead (no functions or indicators on
display):
• Check for 120 VAC on the power supply board
from the blue wire at CN8 (neutral) to the
brown wire on relay RLY1 (L1). If 120 VAC is
not present, check for an open in the wiring
from the power supply board to the terminal
block or the power cord.
• If 120 VAC is present between CN8 and
RLY1, check for 120 VAC at CN12 (primary
of low voltage transformer). If 120 VAC is not
present, replace the power supply board.
Note: If the brown wire is on the wrong terminal of
RLY1, the low voltage transformer will not receive
voltage.
• If 120 VAC is present at CN12, check for
12 VAC on the power supply board
at CN17. If 12 VAC is not present,
replace the low voltage transformer.
If 12 VAC is present at CN17, check
for 12 VDC at CN19, pin #1 and #5.
If voltage is not present, replace the
power supply board. If 12 VDC is
present, replace the operation/smart
board.
Components
Control Panel
The control panel is held in place by 8 tabs on
the inside of the outer cover. The outer cover
must be removed to access the tabs. (See
Outer
Cover
). Depress the tabs inward to remove the
control panel.
Outer Cover
The outer cover must be removed to access the
internal components of the air conditioner. The
cover separates into 2 sections. It is held in place
by 8 Phillips-head screws, 2 on top and 3 on
each side.
Operation/Smart Board
The operation/smart board is located behind the
control panel.
The operation/smart board is held in place by
9 Phillips-head screws. The outer cover must
be removed to access the screws. (See
Outer
Cover
. )
CN19
1
5