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—25—

Check voltage. See the limits on the preceding.
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.

Check for continuity, refer to the wiring diagram
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.

Check the capacitor.
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.

Check the compressor overload, if externally
mounted. Replace if open. (If the compressor
temperature is high, remove the overload, cool it,
and retest.)

Check the voltage. See the limits on the preced-
ing page. 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.)

If not running, determine the cause. Replace if
required.

Remove the cabinet. inspect the interior surface
of the condenser; if restricted, clean carefully
with a vacuum cleaner (do not damage fins) or
brush. Clean the interior base before
reassembling.

If condenser fins are closed over a large area
on the coil surface, head pressures will increase,
causing the compressor to cycle. Straighten the
fins or replace the coil.

Voltage

Wiring

Rotary

Thermostat

Capacitor (Discharge
capacitor before
servicing.) 

Compressor

Overload

Voltage

Overload

Fan motor

Condenser air flow
restriction

Condenser fins
(damaged)

Compressor will not run,
but fan motor runs.

Compressor cycles
on overload.

—26—

Test capacitor.

Check the terminals. If loose, repair or replace.

Check the system for a restriction.

If restricted, clean of replace.

Close if open.

Determine if the unit is properly sized for the 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.

Remove the cabinet and carefully rearrange tubing

not to contact cabinet, compressor, shroud, and

barrier.

Set the knob to COOL (      ) or HEAT (      ) while

rocker switch is ON.

Check terminals. If loose, repair or replace.

Check the synchronous motor for open circuit.

Check the voltage at outlet. If none, correct.

Check the teminals. If loose, repair or replace.

Check for continuity, refer to the wiring diagram for

teminal 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.

Selecter switch must be in the HEAT (      ) mode.

Check continuity of the switch. Continuity should

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.

Capacitor

Wiring

Refrigerating system

Air filter

Exhaust damper door

Unit undersized

Blower or fan

Copper tubing

Rotary switch.

Wiring

Synchronous motor.

No power

Wiring

Rotary switch

Temperature control position

Thermostat

(Temperature control)

Selector switch position

Selector switch

Reverse valve

Compressor cycles on

overload

Insufficient cooling or

heating

Excessive noise.

Auto air-swing fails.

No heat.

—17—

In general, possible trouble is classified in two causes.
The one is called Starting Failure which is caused from an electrical defect, and the other is Ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.

Check of outdoor coil
(heat exchanger) & the fan
operation

Check gas leakage.

Repair gas leak.

Replacement of unit if the
unit is beyond repair.

Satisfactory operation with
temperature difference of
inlet & outlet air ;
COOLING :   7~10

°

C

HEATING  : 15~17

°

C

Check heat load increase in
cooling operation.

Unexpected residue

Added heat load

Check of inside gas
pressure

Adjusting of refrigerant
charge

Malfunction of compressor

Replacement of
compressor

Check of cold (warm) air cir-
culation for smooth flowing

Dirty indoor coil
(Heat exchanger)

Malfunction of fan

Clogged of air filter

Obstruction at air outlet

Countermeasure against
above trouble.

Check clogging in refrigera-
tion circuit.

Repair clogging in refrigera-
tion circuit.

—18—

Check of circuit breaker
and fuse.

Gas leakage of feeler bulb
of thermostat

Check of control switch.

Only fan fails to start.

Improper wiring.

Defect of fan motor
capacitor.

Irregular motor resistance
(    ).
Irregular motor insulation
(    ).

Replacement of fan motor

Regular but fails to start

Replacement of compressor
(locking of rotor, metal)

Improper thermostat setting

Loose terminal connection.

Improper wiring

Irregular motor resistance (   )

Irregular motor insulation (   )

Replacement of compressor
(Motor damaged)

Drop of power voltage.

 Check capacitor.

Replacement.

Only compressor fails to
start.

Defect of compressor
capacitor.

Check of power source.

Check of control switch
setting.