Mitsubishi PUHY-P250YJM-A - Page 152

[ IX Troubleshooting ]
- 143 -
HWE1018A GB
1. Error Code
HIC bypass circuit outlet temperature sensor (TH2) fault (Outdoor unit)
Heat exchanger outlet temperature sensor (TH3) fault (Outdoor unit)
Discharge temperature sensor (TH4) fault (Outdoor unit)
Accumulator inlet temperature sensor (TH5) fault (Outdoor unit)
HIC circuit outlet temperature sensor (TH6) fault (Outdoor unit)
Outside temperature sensor (TH7) fault (Outdoor unit)
2. Error definition and error detection method
If a shorted-circuited (high temperature intake) or an open-circuited thermistor (low temperature intake) is detected (first de-
tection), the outdoor unit stops, goes into the 20-second restart delay mode, and automatically restarts if the thermistor tem-
perature reading is within the normal range at the end of the restart delay mode.
If a short- or open-circuited thermistor is detected again (second detection) after restart, the outdoor unit stops again, goes
into the 20-second restart delay mode, and automatically restarts if the thermistor temperature reading is within the normal
range at the end of the restart delay mode.
When a short or an open is detected again (the third detection) after the previous restart of the outdoor unit, the outdoor unit
makes an error stop.
When a short or an open of the thermistor is detected just before the restart of the outdoor unit, the outdoor unit makes an
error stop, and the error code "5102", "5103", 5104", "5105", "5106"or "5107" will appear.
During 20-second antirestart mode, preliminary errors will be displayed on the LED display.
A short or an open described above is not detected for 10 minutes after the compressor start, during defrost mode, or for 3
minutes after defrost mode.
3. Cause, check method and remedy
<Reference>
5102
5103
5104
5105
5106
5107
Cause Check method and remedy
(1) Thermistor failure Check thermistor resistance.
(2) Pinched lead wire Check for pinched lead wire.
(3) Torn wire coating Check for wire coating.
(4) A pin on the male connector is missing or
contact failure
Check connector.
(5) Disconnected wire Check for wire.
(6) Thermistor input circuit failure on the control
board
Check the intake temperature of the sensor with the LED
monitor.
When the temperature is far different from the actual temper-
ature, replace the control board.
TH2
TH3
TH4
TH5
TH6
TH7
Open detection
-40 C [ -40 F ] and below (130 k )
-40 C [ -40 F ] and below (130 k )
0 C [ 32 F ] and below (698 k )
-40 C [ -40 F ] and below (130 k )
-40 C [ -40 F ] and below (130 k )
-40 C [ -40 F ] and below (130 k )
Short detection
70 C [158 F ] and above (0.4 k )
110 C [230 F ] and above (0.4 k )
240 C [464 F ] and above (0.57 k )
70 C [158 F ] and above (0.4 k )
70 C [158 F ] and above (1.14 k )
110 C [230 F ] and above (0.4 k )