Mitsubishi Heavy Industries FDT200VSAWPVH Service Manual page 100

Error code
Indoor control PCB
Remote control:
E36
Outdoor control PCB
Outdoor inverter
1. Applicable model
All models
2. Error detection method
For the error detection method,
refer to compressor overheat
protective control in the
protective control by controlling
compressor rotation speed of
microcomputer control function
for corresponding models.
3. Condition of error displayed
When discharge pipe
temperature anomaly is detected
2 times within 60 minutes or
this anomalous state is detected
60 minutes continuously
including compressor stop.
4. Presumable cause
• Defective outdoor unit control PCB
• Defective discharge pipe
temperature sensor
• Clogged filter
• Indoor, outdoor unit installation
spaces
• Short-circuit of air on indoor,
outdoor units
• Fouling, clogging of heat exchanger
• Faulty solenoid valve SV1 (at
heating mode)
• Clogging of capillary tube of SV1
circuit (at heating mode)
• Faulty coil of SV1
• Faulty control PCB
• Faulty body of SV1
• Clogging of the strainer on the
upstream of SV1(at heating mode)
• Insufficient amount of refrigerant
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
Keeps flashing
5. Troubleshooting
characteristics of discharge
pipe temperature sensor normal?
discharge pipe temperature
error persisted during cooling /heating
discharge pipe temperature control normal?
temperature (measured actually)
at detection of error correct?
* For the contents of control, refer to compressor discharge pipe temperature
protection in page 35.
* 1
Check the following when SV1
is on.
(Check On/OFF status of SV1
with Mente PC)
Is there any problem
with the coil of SV1 function?
・ Is the coil removed from the body of SV1?
・ Is the coil wiring broken?
・ Is the coil connector
Is 220-240 VAC applied
to the CNF terminal of the control PCB ?
temperature between capillary tube
and compressor of the SV1 circuit below 40 °C
when the compressor is running?
temperature difference between
upstream and downstream of the strainer
Is the amount of refrigerant appropriate?
Red
Content
Stays OFF
1-time flash
Diagnosis
* For the characteristics of
discharge pipe temperature
Are the sensor, refer to E39.
YES
Is the
operation?
NO
Is the
YES
Is the
disconnected?
NO
YES
Is the
YES
Is there a
in the SV1 circuit?
NO
99
- -
'21 • PAC-SM-383
Discharge pipe
temperature error
Countermeasure
Replace discharge pipe
NO
temperature sensor.
Insufficient refrigerant
YES
amount : Recharge
refrigerant by weighing
proper amount on a scale.
Control operation check *
NO
Defective outdoor unit
NO
control PCB ➞ Replace.
Check unit side:
YES
• Isn't filter clogged?
• Are indoor, outdoor unit
installation spaces adequate?
• Isn't there any short-circuit of air?
• Isn't there any fouling, clogging on
indoor heat exchanger?
• In addition to the above, check the
clogging and malfunction of the
SV1 circuit by the flow chart * 1.
YES Fix abnormal condition.
Change control PCB.
NO
Change the body of SV1,
NO
the capillary tube and/or
the strainer in the SV1
circuit.
Change the strainer in the
YES
SV1 circuit.
Adjust to the appropriate
NO
amount of refrigerant.
Due to suspected partial
YES
clogging of SV1 circuit,
change the body of SV1,
the capillary tube and/or the
strainer in the SV1 circuit.
or
Check the other actuator.