50
8.5
Fault codes displayed at the Remote controller.
Fault
Code
Symptom
Status of Air
Conditioner
Notes
Diagnostic Functions
1. For an I/D fault, when other I/D units are operating,
the O/D unit continues, the relevant M/C PMV
closes and the faulty I/D unit fan operation continues.
2. Float switch open circuit.
3. Drain pipe blocked.
4. Drain pump fault.
Inter-unit communication.
1. Wiring fault between I/D and M/C, or M/C and O/D
Interface control board, or O/D Interface control
board and O/D Inverter control board.
2. This fault code is also displayed when the Inverter
heat sink TRS thermal switch operates.
SERIAL SIGNAL FAULT
FLOAT SWITCH
OPERATION
INDOOR
HEAT EXCHANGER
SENSOR (TC)
MULTI CONTROLLER
FAULT
Outdoor unit
stops.
Indoor unit fan
continues.
Indoor unit or Multi
controller.
Operation stops
for Multi
controller fault.
Indoor unit fan
continues for
Indoor unit fault.
RETURN AIR
TEMPERATURE
SENSOR (TA)
Indoor unit fan
continues
1. For an I/D fault, when other I/D units are operating,
the O/D unit continues, the relevant M/C PMV
closes and the faulty I/D unit fan operation continues.
2. Sensor open / short circuit.
Indoor unit fan
stops.
(PREHEAT
DEFROST is
displayed on
R/C)
1. O/D unit stops when the faulty Indoor unit is
the only unit operating.
2. Sensor open / short circuit.
3. Check the defrosting of the I/D heat exchanger.
Operation
stops
1. Refer to Multi controller diagnostics and fault codes.
Operation
stops
1. Refer to Outdoor unit diagnostics and fault codes.
Operation
stops
INVERTER FAULT
OUTDOOR UNIT
FAULT
1. Inverter compressor fault (short circuit).
2. Check the power supply, wiring, fuses, giant
transistor, base drive board, smoothing capacitor,
rectifier diode and compressor.
Summary of Contents for MAR-C104M8-1-PE
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Page 58: ...61 13 EXPLODED VIEWS AND SERVICE PARTS LISTS 13 1 Outdoor Unit MAR C104M8 1 PE ...
Page 60: ...63 13 3 Outdoor Units MAR M104HTM8 1 PE MAR F104HTM8 1 PE ...
Page 63: ...66 13 6 Outdoor unit electrical parts assembly MAR C104M8 1 PE ...
Page 65: ...68 MAR M104HTM8 1 PE MAR F104HTM8 1 PE ...
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