Mitsubishi Heavy Industries FDT200VSAWPVH Service Manual page 109

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 outdoor unit fan
• Faulty body of SV1
• Faulty outdoor unit control
PCB
• Short-circuit of air on outdoor
units
• Fouling, clogging of heat
exchanger
• Clogged filter
• Abnormal condition of Tho-H,
Tho-D, Tho-S, PSL
• Faulty coil of EEVH
• Faulty body of EEVH
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
Keeps flashing
5. Troubleshooting
problem with the outdoor unit fan?
・ Is there any short-circuit of outdoor unit air?
・ Is there any fouling, clogging on outdoor
heat exchanger?
problem with installing the
sensor (Tho-H, Tho-D, Tho-S, PSL)?
・Is the connector (Tho-H, Tho-D, Tho-S, PSL) disconnectedor half-inserted?
・Is the insulation of the sensor (Tho-H, Tho-D, Tho-S)
temperature and pressure of the
sensors (Tho-H, Tho-D, Tho-S, PSL) correct?
(By comparison between actual measured value
and Mente PC or 7-segment data)
problem with the coil of EEVH function?
・ Is the coil removed from the body of EEVH?
・ Is the coil wiring broken?
・ Is the coil connector
Is the valve of EEVH normal?
・ Check the start-up sound and vibration of EEVH 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
insufficient?
NO
Is the detection
YES
Is there any
disconnected?
NO
NO
Does EEVH
operate when EEVH connector
is connected to CNEEV1 and
the power source
is turned on?
108
- -
'21 • PAC-SM-383
Liquid back error
(Heating 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 EEVH.
NO
Change control PCB.
YES
Change the body of SV1.
YES
Check the other actuator.
NO