Mitsubishi FDC 6 Series User Manual

29
5
The discharge gas temperature is too high. (Only case of FDC(P)208~508 type)
4
The outdoor heat exchanger temperature is too high (70°C or over)
Are the heat
exchanger thermistor
Charateristisc
Normal?
YES
NO
NO
Heart exchanger thermistor
replacement
Is the unit
normalized
Defective outdoor unit
PCB Replacement
(Defective heat exchanger
thermistor input circuit)
Cooling, overload
operation?
Check the unit side closely
• Is outdoor fan motor operating?
• Is the outdoor unit shortcircuited?
• Is the installation space adequate?
• Is there too much refrigerant?
Reset
Error stop
60°C70°C
Outdoor unit heat exchanger temperature
(1)
(1)
Note (1) Outdoor unit heat exchanger thermistor detects
the state of cooling overload operation.
Outdoor unit
Red LED
Green LED
4 time flashes
Stays OFF
Temperature
15
10
5
0°C10°C30°C40°C20°C50°C
5kΩ at 25°C
Is the outdoor
unit heat exchanger
themistor connector
OK?
Repair
NO
YES
NO
YES
Are the outdoor
unit heat exchanger themistor
characteristics OK, is there
any broken wire?
Defective outdoor unit
heat exchanger thermistor
Replacement
Defective outdoor unit PCB
Replacement (Defective
outdoor unit heat exchanger
thermistorinput circuit)
Outdoor unit heat exchanger
thermistor (Th
O-R) Resistance
temperature characteristics
Resistance
(kΩ)
Note (1) 22kΩ at -6°C
6
Defective outdoor unit heat exchanger thermistor
Outdoor unit
Red LED
Green LED
1 time flash
1 time flash
Outdoor unit
Red LED
Green LED
5 time flashes
Stays OFF
Is the
discharge gas ther-
mistror characteristics
normal?
YES
NO
NO
Discharge pipe thermis-
tor replacement
Is the unit
normalized
Defective outdoor unit
PCB Replacement
(Defective discharge gas
thermistor input circuit)
Discharge gas
temperature error?
(At cooling/heating
operation)
Check the unit side.
Check the unit side.
• Insufficient refrigerant
Charge the refrigerant (measure)
• Is it the overload operation?
Operable
Error stop
90°C 135°C
Discharge pipe temp.
• During cooling: Is FMo operating?
• During heating: Is FMI operating?
Are control valves (both liquid,
gas) fully opened during both
cooling and heating.
• Is the installation space of indoor/
outdoor units adequate?
• Is there any short circuit air flow
for indoor/outdoor units?

Mitsubishi FDC 6 Series Specifications

General

Brand	Mitsubishi
Model	FDC 6 Series
Category	Air Conditioner
Language	English