Error Codes 5102, 5103, 5104, 5105, 5106, 5107 - Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook

[ IX Troubleshooting ]
1. Error Code
5102
HIC bypass circuit outlet temperature sensor (TH2) fault (Heat source unit)
5103
Heat exchanger outlet temperature sensor (TH3) fault (Heat source unit)
5104
Discharge temperature sensor (TH4) fault (Heat source unit)
5105
Accumulator inlet temperature sensor (TH5) fault (Heat source unit)
5106
HIC circuit outlet temperature sensor (TH6) fault (Heat source unit)
5107
Outside temperature sensor (TH7) fault (Heat source unit)
2. Error definition and error detection method
ŒWhen a short (high temperature intake) or an open (low temperature intake) of the thermistor is detected (the first detection),
the heat source unit stops, turns to anti-restart mode for 3 minutes, and restarts when the detected temperature of the therm-
istor.
ŒWhen a short or an open is detected again (the second detection) after the first restart of the heat source unit, the heat source
unit stops, turns to anti-restart mode for 3 minutes, and restarts in 3 minutes when the detected temperature is within the nor-
mal range.
ŒWhen a short or an open is detected again (the third detection) after the previous restart of the heat source unit, the heat
source unit makes an error stop.
ŒWhen a short or an open of the thermistor is detected just before the restart of the heat source unit, the heat source unit makes
an error stop, and the error code "5102", "5103", 5104", "5105", "5106"or "5107" will appear.
ŒDuring 3-minute antirestart mode, preliminary errors will be displayed on the LED display.
ŒA 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
Cause
(1) Thermistor failure
(2) Pinched lead wire
(3) Torn wire coating
(4) A pin on the male connector is missing or
contact failure
(5) Disconnected wire
(6) Thermistor input circuit failure on the control
board
<Reference>
HWE09080
Short detection
TH2 70 C [158 F ] and above (0.4 k ) -40 C [ -40 F ] and below (130 k )
TH3 110 C [230 F ] and above (0.4 k ) -40 C [ -40 F ] and below (130 k )
TH4 240 C [464 F ] and above (0.57 k ) 0 C [ 32 F ] and below (698 k )
TH5 70 C [158 F ] and above (0.4 k ) -40 C [ -40 F ] and below (130 k )
TH6 70 C [158 F ] and above (1.14 k ) -40 C [ -40 F ] and below (130 k )
TH7 110 C [230 F ] and above (0.4 k ) -40 C [ -40 F ] and below (130 k )
- 260 -
Check method and remedy
Check thermistor resistance.
Check for pinched lead wire.
Check for wire coating.
Check connector.
Check for wire.
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.
Open detection
GB