Responding To Error Display On The Remote Controller - Mitsubishi Electric PUHY-P200 Service Handbook

[2] Responding to Error Display on the Remote Controller

1. Mechanical problems
Checking code
0403 Serial Serial transmission failure
transmission between the main board and the
abnormality INV board, and between the
main board and the FAN board.
1102 Discharge 1. When 120˚C or more
temperature
abnormality
(Outdoor unit)
2. When 120 °C or higher
3. When 120˚C or more
4. When 120˚C or more
5. 30 minutes after stop of
✻
For the check code on the inverter, refer to
Meaning, detecting method
Detail code 01:
Between the main board and
the INV board
Detail code 05:
Between the main board and
the FAN board
discharge temperature is
detected during operations
(the first time), outdoor unit
stops once, mode is changed
to restart mode after 3
minutes, then the outdoor unit
restarts.
discharge is detected again
(the second time) within 30
minutes after the first stop of
outdoor unit, mode is
changed to restart mode after
3 minutes, then the outdoor
unit restarts.
discharge is detected, again
(the third time) within 30
minutes after previous stop of
outdoor unit, emergency stop
is observed with code
No."1102" displayed.
discharge is detected 30 or
more minutes after previous
stop of outdoor unit, the stop
is regarded as the first time
and the process shown in 1.
is observed.
outdoor unit is intermittent
fault check period with LED
displayed.
"
6. Inverter and compressor
Cause
(1) Defective wiring.
(2) Inverter address switches
are set wrong.
(3) Transformer failure.
(4) Defective INV board.
Defective FAN board.
(1) Gas leak, gas shortage.
(2) Overload operations.
(3) Poor operations of indoor
LEV.
(4) Poor operations of OC
controller LEV1.
(5) Poor operations of ball valve.
(6) Outdoor unit fan block, motor
trouble, poor operations of
fan controller Heating
(Heating-only, Heating-main).
(3) ~ (6) : Rise in discharge
temp. by low pressure drawing.
(7) Gas leak between low and
high pressures.
4-way valve trouble, compressor
trouble, solenoid valve SV1 trouble.
(8) Thermistor trouble
(TH11, TH12).
(9) Thermistor input circuit
trouble on control circuit
board.
"
in the section [4]
- 98 -
Checking method & Countermeasure
Check for wiring between the
main board connector CNRS3B
and the INV board connector
CNRS1 or between the main
board connector CNRS3A and
the FAN board connector
CNRS2 or check for contact the
connector.
Check for contact of the
connector CNAC3 on the main
board or of the connector CNTR
on the FAN board.
Check the address of SW2-1 on
the INV board.
Check SW2-1 on the FAN board
whether it is ON.
Measure voltages between pins
1 and 3 of the FAN board
connector CNTR.
Replace the INV board or the
FAN board when the power
turns on automatically, even if
the power is reset.
See Refrigerant amount check.
Check operating conditions and
operation status of
indoor/outdoor units.
Check operation status by
actually performing cooling or
heating operations.
Cooling : Indoor LEV
(Cooling-only) LEV1
Heating : Indoor LEV
(Heating-only)
See Trouble check of LEV and
solenoid valve.
Confirm that ball valve is fully
opened.
Check outdoor fan.
See Trouble check of outdoor
fan.
Check operation status of
cooling-only or heating-only.
Check resistance of thermistor.
Check inlet temperature of
sensor with LED monitor.
"
Troubleshooting of principal parts
"