8
ACCESSING THE CONTROL BOX ASSEMBLY
ACCESSING COMPONENTS AT THE FRONT
OF THE AIR CONDITIONER
Components accessible from the front of the unit include:
•
The Control Box Assembly: This assembly contains the electronic control board, the key
touch/display printed circuit board and the thermistor. If it is necessary to replace these com-
ponents, the entire control box assembly must be replaced. The service replacement control
box assembly must be ordered by using the specific model number of the air conditioner being
serviced.
!
WARNING
ELECTRICAL SHOCK HAZARD
Disconnect power before servicing the air conditioner.
Replace all panels before operating the air conditioner.
Failure to do so can result in death or electrical shock.
INSET
In most situations, access to the control box
assembly can be accomplished with the air
conditioner installed in the customer’s window.
!
NOTE
1. Disconnect power from the air conditioner.
2. Remove the four (4) screws securing the front panel.
(Fig. 3-2)
3. Disconnect the wiring harness connectors from the control panel wiring plugs.
(Fig. 3-2, INSET)
These connectors are:
• WHITE Fan Motor Connector (3-wires:
black, blue and red)
• 2-Power Cord Connectors (black and
white)
• WHITE Compressor/Capacitor Connector
(2 Wires)
4. Remove the two (2) screws securing the
control box assembly to the front panel.
(Fig. 3-3)
Screws
Fig. 3-2
Fig. 3-3
17
PROBABLE CAUSE
CORRECTION
PROBLEM
5. Insufficient cooling
- Compressor and
Fan run
(continued)
6. Compressor stops
and starts: too
short running time
7. House circuit
blowing
5d. Low voltage
5e. Improper seals
5f. Improper use
5g. Fan speed too slow
6a. Incorrect voltage
6b. Temp Controls set too warm
6c. Failed thermistor
6d. Failed compressor, controls
controlling compressor, incorrect
wiring
6e. Fan motor too slow
7a. Improper fuses
7b. Failed component or incorrect
wiring
5d. Check power supply. See
1b.
5e. Insulating seals out of place
or missing on unit. Doors or win-
dows open.
5f. Excessive load. Advise cus-
tomer if load is excessive or in-
stallation is incorrect or inad-
equate. Instruct on proper op-
eration of controls.
5g. Check for wrong motor,
blower wheel or fan blade.
Check for binding of fan blade,
blower wheel or motor shaft.
Check for low voltage and cor-
rect capacitor.
6a. Check for proper voltage
6b. Instruct customer
6c. Check thermistor location
(see pg. 19) and response to
temperature change by sub-
merging it in ice water (compres-
sor should cycle OFF) or hold-
ing it in your closed hand (com-
pressor should START).
6d. Check compressor wind-
ings, all wiring, overload and ca-
pacitor for shorts.
6e. Check for wrong motor,
blower wheel or fan blade.
Check for low voltage, binding of
fan blade, blower wheel or mo-
tor bearings.
7a. Check for correct size of
fuse or breaker. Check amp
draw.
7b. Check wiring and connec-
tions. Check operation of all
components.
TROUBLESHOOTING CHART
