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—29—
NO
NO
NO
NO
YES
YES
YES
Is the IC6 all right?
Is the connection of
CN-DISP1 all right?
• Exchange the display
PCB Ass'y.
PCB Ass'y.
• Exchange IC6.
• Exchange TR1,
TR2, TR3.
TR2, TR3.
• Connect connector
to CN-DISP1 exactly.
to CN-DISP1 exactly.
Does the TR1,
TR2, TR3 operate normally
on main PCB Ass'y?
NO
NO
YES
YES
Is the Knob of SW1
set to left position?
Is the voltage No.3 of
CN-DISP2 of Main PCB
Ass'y DC 5V?
• Reference to
OWNER'S MANUAL.
OWNER'S MANUAL.
• Set the Knob of SW1
to left position.
to left position.
• Check the SW1.
• Check the pattern of
Main & Display PCB.
• Check the pattern of
Main & Display PCB.
Possible Trouble 6
It displays abnormally on display PCB Ass'y.
Possible Trouble 7
The function of Auto Restart does not operate.
—30—
ROOM AIR CONDITIONER VOLTAGE LIMITS
Check voltage at outlet. Correct if none.
Check voltage to rotary switch. If none, check
power supply cord. Replace cord if circuit is open.
Check switch continuity. Refer to wiring diagram
for terminal identification. Replace switch if
defective.
Connect wire. Refer to wiring diagram for terminal
identification. Repair or replace loose terminal.
Test capacitor.
Replace if not within ±10% of manufacturer's
rating. Replace if shorted, open, or damaged.
Fan blade hitting shroud or blower wheel hitting
scroll. Realign assembly.
Units using slinger ring for condenser fan must
have
1
/
4
to
5
/
16
inch clearance to the base. If it hits
the base, shim up the bottom of the fan
motor with mounting screw(s).
Check fan motor bearings; if motor shaft will not
rotate, replace the motor.
Check voltage. If not within limits, call an
electrician.
Test capacitor.
Check bearings. Does the fan blade rotate freely?
If not, replace fan motor.
Pay attention to any change from high speed to
low speed. If the speed does not change, replace
the motor.
No power
Power supply cord
Rotary switch
Wire disconnected or
connection loose
Capacitor (Discharge
capacitor before testing.)
Will not rotate
Revolves on overload.
Fan motor will not run.
Fan motor runs
intermittently
COMPLAINT
CAUSE
REMEDY
—31—
COMPLAINT
CAUSE
REMEDY
If cracked, out of balance, or partially missing,
replace it.
replace it.
If cracked, out of balance, or partially missing,
replace it.
replace it.
Tighten it.
If knocking sounds continue when running or
loose, replace the motor. If the motor hums or
noise appears to be internal while running,
replace motor.
loose, replace the motor. If the motor hums or
noise appears to be internal while running,
replace motor.
Check voltage. See the limits on the preceeding
page. If not within limits, call an electrician.
page. If not within limits, call an electrician.
Check the wire connections, if loose, repair or
replace the terminal. If wires are off, refer to wiring
diagram for identification, and replace. Check wire
locations. If not per wiring diagram, correct.
replace the terminal. If wires are off, refer to wiring
diagram for identification, and replace. Check wire
locations. If not per wiring diagram, correct.
Check for continuity, refer to the wiring diagram
for terminal identification. Replace the switch if
circuit is open.
for terminal identification. Replace the switch if
circuit is open.
Check the position of knob If not at the coldest
setting, advance the knob to this setting and
restart unit.
Check continuity of the thermostat. Replace
thermostat if circuit is open.
setting, advance the knob to this setting and
restart unit.
Check continuity of the thermostat. Replace
thermostat if circuit is open.
Check the capacitor.
Replace if not within ±10% of manufacturers
rating. Replace if shorted, open, or damaged.
Replace if not within ±10% of manufacturers
rating. Replace if shorted, open, or damaged.
Check the compressor for open circuit or ground.
If open or grounded, replace the compressor.
If open or grounded, replace the compressor.
Check the compressor overload, if externally
mounted. Replace if open. (If the compressor
temperature is high, remove the overload, cool it,
and retest.)
mounted. Replace if open. (If the compressor
temperature is high, remove the overload, cool it,
and retest.)
Check the voltage.
If not within limits, call an electrician.
If not within limits, call an electrician.
Check overload, if externally mounted.
Replace if open. (If the compressor temperature
is high, remove the overload, cool, and retest.)
Replace if open. (If the compressor temperature
is high, remove the overload, cool, and retest.)
Check the system for a restriction.
Fan
Blower
Loose clamper
Worn bearings
Voltage
Wiring
Rotary
Thermostat
Capacitor (Discharge
capacitor before servicing.)
capacitor before servicing.)
Compressor
Overload
Voltage
Overload
Refrigerating system
Fan motor noise.
Compressor will not run,
but fan motor runs.
but fan motor runs.
Compressor cycles on
overload.
overload.
—32—
COMPLAINT
CAUSE
REMEDY
If restricted, clean or replace.
Close if open.
Determine if the unit is properly sized for the
area to be cooled.
area to be cooled.
Check the set screw, or clamp. If loose or missing,
correct. If the blower or fan is hitting air guide,
rearrange the air handling parts.
correct. If the blower or fan is hitting air guide,
rearrange the air handling parts.
Remove the cabinet and carefully rearrange
tubing not to contact cabinet, compressor, shroud,
and barrier.
tubing not to contact cabinet, compressor, shroud,
and barrier.
Check the voltage at outlet. If none, correct.
Check the terminals. If loose, repair or replace.
Check for continuity, refer to the wiring diagram for
terminal identification. Replace the switch if the
circuit is open.
terminal identification. Replace the switch if the
circuit is open.
Check setting. Turn to warmest position.
Check the position of knob. If not at the warmest
setting, advance knob to this setting. Check conti-
nuity of the thermostat. Check continuity of control
by removing lead from terminal, turn the
selector switch to heat, and check between com-
mon terminal and H terminal. (NOTE: Room tem-
perature should be 30°C(86°F) or lower when test-
ing the temperature control.) If no continuity
exists, replace thermostat.
setting, advance knob to this setting. Check conti-
nuity of the thermostat. Check continuity of control
by removing lead from terminal, turn the
selector switch to heat, and check between com-
mon terminal and H terminal. (NOTE: Room tem-
perature should be 30°C(86°F) or lower when test-
ing the temperature control.) If no continuity
exists, replace thermostat.
Selector switch must be in the " " mode.
Check continuity of the switch. Continuity should
be between terminals identified on wiring diagram
when the switch is in heat mode.
be between terminals identified on wiring diagram
when the switch is in heat mode.
Check continuity of the reverse valve coil.
Continuity should be between two lead wires.
If none, check the reverse valve body.
Replace the part which is defective.
Continuity should be between two lead wires.
If none, check the reverse valve body.
Replace the part which is defective.
Air filter
Exhaust damper door
Unit undersized
Blower or fan
Copper tubing
No power
Wiring
Rotary switch
Temperature control position
Thermostat
(Temperature control)
(Temperature control)
Selector switch position
Selector switch
Reverse valve
Insufficient cooling or
heating.
heating.
Excessive noise.
No heat.
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