Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 1080

FDC-HKXR
3
Error display:
Indoor unit
Red LED Stays OFF
Green LED Keeps flashing
Is the unit
No. duplicated on
outdoor units?
Defective outdoor unit PCB
Replacement (Defective unit
No. read circuit)
4
Error display:
Indoor unit
Red LED Stays OFF
Green LED Keeps flashing
52C secondary side L
phase open?
Defective outdoor unit PCB
Replacement
(Defective CT circuit)
5
Error display:
Indoor unit
Red LED Stays OFF
Green LED Keeps flashing
Is the
discharge gas ther-
mistror characteristics
normal?
NO
Discharge pipe thermis-
tor replacement
Is the unit
normalized
NO
Defective outdoor unit
PCB Replacement
(Defective discharge gas
thermistor input circuit)
1078
[Duplicated unit No. of outdoor units]
Outdoor unit
Red LED
Green LED
YES
Correction
NO
[Open phase at L
Outdoor unit
Red LED
Green LED
(1)
YES
Repair
3
NO
(2)
[Discharge temperature error]
Outdoor unit
Red LED
Green LED
Discharge gas
Check the unit side.
temperature error?
YES
• Insufficient refrigerant
(At cooling/heating
operation)
• Is it the oveload operation?
Operable
90ºC 130ºC
Discharge pipe temp.
8 time flash
Keeps flashing
Note (1) When the PCB is defective, the flash patterns of outdoor
unit red LED, green LED may become irregular.
phase of 52C secondary side (CM
3
(1)
2 time flash
Keeps flashing
Notes (1) When voltage is detected at 52C primary side but not at the
secondary side, check also 52C (broken coil, poor contact).
(2) When voltage is detected at 52C primary side L
there is no error at 52C, the outdoor unit PCB (defective
52X
01
thermostat circuit) is defective.
(1)
5 time flash
Keeps flashing
Charge the refrigerant (measure)
Error stop
)]
2
circuit or 52X ) or indoor unit PCB (defective
01
Check the unit side.
• During cooling: Is FM
operating?
0
• During heating: Is FM
operating?
1
Are service valves (both liquid,
gas) fully opened during both
cooling and heating.
• Is the installation space of indoor/
outdoor unit adequate?
• Is there any short circuit air flow
for indoor/outdoor units?
phase and
3