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[ IX Troubleshooting ]
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HWE09080 GB
1. Error Code
HIC bypass circuit outlet temperature sensor (TH2) fault (Heat source unit)
Heat exchanger outlet temperature sensor (TH3) fault (Heat source unit)
Discharge temperature sensor (TH4) fault (Heat source unit)
Accumulator inlet temperature sensor (TH5) fault (Heat source unit)
HIC circuit outlet temperature sensor (TH6) fault (Heat source unit)
Outside temperature sensor (TH7) fault (Heat source unit)
2. Error definition and error detection method
When 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.
When 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.
When 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.
When 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.
During 3-minute 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 )