Mitsubishi Electric PUHY-P200 Service Handbook page 110

Checking code Meaning, detecting method
5101 Discharge 1. Shorting (high temperature
(TH11) intake) or open (low
(TH12) temperature intake) of the
thermistor is detected. (First
Piping detection)
5105
(TH5) The outdoor unit will stop at
once and the restart
prevention mode will be
5106 Outdoor operated for 3 minutes. When
air the detection temperature of
tempera- the thermistor is within the
ture normal range just before the
(TH6) restart, the unit must be
restarted.
2. When shorting or open is
5107
Liquid detected again (second
tempera- detection) during the
ture operation after the restart, the
(TH7) outdoor unit will stop at once
and the restart prevention
mode will be operated for 3
SC coil minutes. When the detection
5108
outlet temperature of the thermistor
(TH8) is within the normal range just
before the restart, the unit
must be restarted.
3. When shorting or open is
detected again (third
detection) during the
operation after the restart, the
outdoor unit will make an
error stop.
4. When shorting or open of the
thermistor is detected just
before the restart, the unit will
make an error stop and check
code "5101", "5103", "5104",
"5105", "5106", "5107", and
"5108" will appear.
5. LED display, which indicates
the grace period, will appear
while the restart prevention
mode is being operated.
6. Shorting or open is not
detected for 10 minutes after
starting the compressor or for
3 minutes during or after
defrosting.
5110 Radiator THHS open or shorting is
panel detected just before starting the
temperature inverter or during operation.
sensor
abnormality
Error details 01:
Compressor
INV side
Error details 05:
Fan INV side
✻
For the check code on the inverter, refer to
Cause
(1) Thermistor failure
(2) Pinched lead wire
(3) Coating tear
(4) No pin on the connector,
contact failure
(5) Disconnected wire
(6) Thermistor input circuit
failure on the main board
Shorting detection
TH11 240˚C or higher (0.57kΩ)
TH12 240˚C or higher (0.57kΩ)
TH5 110˚C or higher (0.4kΩ)
TH6 110˚C or higher (0.4kΩ)
TH7 70˚C or higher (1.14kΩ)
TH8 70˚C or higher (0.4kΩ)
(1) THHS sensor failure
(2) Contact failure
(3) INV board failure of the
compressor or the fan
" "
6. Inverter and compressor in the section [4]
- 108 -
Checking method & Countermeasure
Thermistor resistance check
Check for lead wire.
Check for coating.
Check for connector.
Check for wire.
Check the intake temperature of
the sensor with the LED monitor.
When the temperature is far
different from the actual
temperature, replace the control
board.
Open detection
0˚C or lower (643kΩ)
0˚C or lower (643kΩ)
-40˚C or lower (130kΩ)
-40˚C or lower (130kΩ)
-40˚C or lower (130kΩ)
-40˚C or lower (130kΩ)
Check for short circuit in THHS
sensor.
Replace THHS sensor.
Replace INV board of the
compressor or the fan.
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Troubleshooting of principal parts
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