Panasonic CW-A90VE Service Manual page 7

Trouble
• • • • Temperature
Compressor won't run
(Fan run). setting.
• • • • RESISTANCE
between Terminal
and the
Compressor Body.
• • • • RESISTANCE
between Terminals.
• • • • Overload Protector.
• • • • Capacitor
Compressor.
• • • • Thermostat.
• • • • Main Control
Switch.
• • • • Air Swing Switch.
Air Swing won't run.
• • • • Resistance
between wires.
• • • • Temperarute
Insufficient cooling or
heating. Setting.
• • • • Ventilation door
open.
• • • • Air filter dirty.
• • • • Location of
installation.
• • • • Evaporator /
Condenser Coil
obstructed.
• • • • Unit capacity for
the room too small.
• • • • Temperature
difference and
running current.
• • • • Source of Noise
Noise.
• • • • Unit installation.
Water dripping inside
room.
• • • • Drain Tray-
Styrofoam pieces
blocking drain
channel.
• • • • Temperature
Frozen Evaporator
setting.
• • • • Air filter /
Evaporator.
• • • • Temperature
difference and
running current.
• • • • Reversing
No heating (Fan and
Compressor run). coil.
• • • • Reversing valve.
• • • • Outdoor
Frozen Condenser
temperature
Check Result
• • • • Higher than room
temp.
• • • • Shorted.
• • • • Shorted.
• • • • Infinity between
Terminals.
• • • • OHM Meter doesn't
deflect.
• • • • No click heard.
• • • • No contacts at
Position Shown.
• • • • OFF position.
• • • • No contact at
position.
• • • • OHM Meter doesn't
deflect.
• • • • Higher than room
temperature
• • • • Open.
• • • • Clogged or dirty.
• • • • Sunlight hitting
outdoor side.
• • • • Obstacles.
• • • • Clogged or dirty.
• • • • Not satisfied.
• • • • REFER TO
PERFORMANCE
EVALUATION.
• • • • Vibration.
• • • • Intermittent Noise.
• • • • Tilted to inside room.
• • • • Clogged.
• • • • Set too low for
ambient conditions.
• • • • Clogged or Dirty.
• • • • REFER TO
PERFORMANCE
EVALUATION.
• • • • Infinity between coil.
valve
• • • • Resistance between
reversing valve coil.
• • • • Heating operation at
ambient
low outdoor ambient
temperature
Cause
• • • • Winding Coil touched to
the compressor shell.
• • • • Rear Shorted or Burnt out.
• • • • Rear Shorted or Burnt out.
• • • • Overload Protector defect.
• • • • Capacitor defect.
• • • • Thermostat defect.
• • • • Main Control Switch defect.
• • • • Open circuit.
• • • • Shorted or open circuit.
• • • • Reduces capacity.
• • • • Restricted air circulation.
• • • • Restricted Heat Exchanger.
• • • • Restricted Heat Exchanger.
• • • • Restricted air circulation.
• • • • Leakage of refrigerant or
refrigeration system is
blocked.
• • • • Faulty installation.
• • • • Fan hitting objects.
• • • • Refrigerant tubing touching
each other.
• • • • Fan splashing Drain Water
• • • • Restricted run off.
• • • • Clogged or blocked.
• • • • Outdoor temperature low
(Night time).
• • • • Restricted air circulation.
• • • • Leakage of refrigerant or
refrigeration system is
blocked.
• • • • Outdoor
ambient
temperature is low.
7
CW-A90VE / CW-A120VE
Remedy
• • • • Set it lower.
• • • • Replace Compressor.
• • • • Replace Compressor.
• • • • Replace Overload
Protector.
• • • • Replace Capacitor
Compressor.
• • • • Replace Thermostat.
• • • • Replace Main Control
Switch.
• • • • Set it ON.
• • • • Replace Air Swing Switch.
• • • • Replace Air Swing Motor.
• • • • Set it lower.
• • • • Close Ventilation door.
• • • • Clean or replace Air Filter.
• • • • Consider building an
AWNING.
• • • • Remove obstacles or
reinstall unit.
• • • • Clean the coils.
• • • • Replace the unit with
bigger one.
• • • • Locate repair leak.
• • • • Flush refrigeration cycle.
• • • • Reinstall unit or Reinforce
the installation.
• • • • Adjust Fan position or
remove foreign materials.
• • • • About 1/2" Clearance
needed.
• • • • Remove drain plug and
mount a drain pan to
remove the water.
• • • • Set the Drain outlet
downward, so that the
Drain water can run off
• • • • Tilt unit to outside slightly.
• • • • Remove the foreign
materials.
• • • • Set the Main Control Knob
to Fan to melt ice and set
the Temperature control to
higher temperature.
• • • • Clean Air filter /
Evaporator.
• • • • Locate and repair leak.
• • • • Flush refrigeration cycle.
• • • • Replace reversing valve
coil.
• • • • Replace reversing valve.
• • • • Set Main Control Switch to
Fan to melt ice.