Mitsubishi Heavy Industries FDT200VSAWPVH Service Manual page 108

Error code
Indoor control PCB
Remote control:
E44
Outdoor control PCB
Outdoor inverter
1. Applicable model
All models
2. Error detection method
Detected by under-dome
superheat.
3. Condition of error displayed
When abnormal liquid back
is detected 3 times within 90
minutes, the compressor stops.
4. Presumable cause
• Faulty indoor unit fan
• Faulty body of SV1
• Faulty outdoor unit control
PCB
• Short-circuit of air on indoor
units
• Fouling, clogging of heat
exchanger
• Clogged filter
• Abnormal condition of Tho-H,
Tho-R1, Tho-R2, PSL
• Faulty coil of EEVC
• Faulty body of EEVC
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
Keeps flashing
5. Troubleshooting
problem with the indoor unit fan?
・ Is there any short-circuit of indoor unit air?
・ Is there any fouling, clogging on indoor heat exchanger?
・ Is the filter in indoor unit clogged?
problem with the sensor
installation (Tho-H, Tho-R1, Tho-R2, PSL)?
・ Is the connector (Tho-H, Tho-R1, Tho-R2, PSL) disconnected
・ Is the insulation of the sensor (Tho-H)
temperature and pressure of the
sensors (Tho-H, Tho-R1, Tho-R2, PSL) correct?
(By comparison between actual measured value
and Mente PC or 7-segment data)
problem with the coil of EEVC function?
・ Is the coil removed from the body of EEVC?
・ Is the coil wiring broken?
・ Is the coil connector
sound and vibration of EEVC generated
when the power source is turned on?
YES
Check the followings when
SV1 is OFF.
(Check ON/OFF status of
SV1 by Mente PC.)
Is 220-240
VAC applied to the
CNF terminal on the
control PCB ?
NO
Is the
temperature between
capillary tube and compressor of the
SV1 circuit below 40°C when the
compressor is
running?
Red
Content
Stays OFF
1-time flash
Diagnosis
・ Is there any
NO
・ Is there any
or half-inserted?
insufficient?
NO
Is the detected
YES
Is there any
disconnected?
NO
Is the start-up
NO
Does EEVC
operate when EEVC connector
is connected to CNEEV2 and
the power source
is turned on?
107
- -
'21 • PAC-SM-383
Liquid back error
(Cooling mode)
Countermeasure
Fix abnormal condition.
YES
Fix abnormal condition.
YES
Change the sensor.
NO
Fix abnormal condition.
YES
Change control PCB.
YES
Change the body of EEVC.
NO
Change control PCB.
YES
Change the body of SV1.
YES
Check the other actuator.
NO