Mitsubishi Electric CITY MULTI PURY-200M-B-BM. BSG Service Handbook page 23

[ V Troubleshooting ]
Temperature sensor failure (Outdoor unit)
Error Code
5101 Discharge
(TH1)
5103 Liquid level de-
tection (TH3)
5104 Liquid level de-
tection (TH4)
5105 Piping (TH5)
5106 OA tempera-
ture (TH6)
5107 Piping (TH7)
Error definition and error
detection method
1. When a short (high
temperature intake) or
an open (low tempera-
ture intake) of the ther-
mistor is detected (the
first detection), the
outdoor unit stops,
turns to anti-restart
mode for 3 minutes,
and restarts when the
detected temperature
of the thermistor.
2. When a short or an
open of the thermistor
is detected just before
the restart of the out-
door unit, the outdoor
unit makes an error
stop, and the error
code "5101", "5103",
"5104", "5105", "5106"
or "5107" will appear.
3. During 3-minute anti-
restart mode, prelimi-
nary errors will be dis-
played on the LED
display.
4. A short or an open de-
scribed above is not
detected for 10 min-
utes after the com-
pressor start, during
defrost mode, or for 3
minutes after defrost
mode.
Cause
(1) Thermistor failure
(2) Pinched lead wire
(3) Torn wire coating
(4) A pin on the male connec-
tor is missing or contact
failure
(5) Disconnected wire
(6) Thermistor input circuit fail-
ure on the main board
Short detection
240 C [464 F ] and above (0.57 k )
TH1
TH3 70 C [158 F ] and above (1.14 k )
TH4 70 C [158 F ] and above (1.14 k )
TH5 110 C [230 F ] and above (0.4 k )
TH6 110 C [230 F ] and above (0.4 k )
70 C [158 F ] and above (1.14 k )
TH7
- 22 -
Check method and remedy
Check thermistor resistance.
Check whether the lead wire is
pinched.
Check for wire coating.
Check connector.
Check whether the wire is connect-
ed.
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
15 C [ 59 F ] and below (321 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 )
-40 C [ -40 F ] and below (130 k )
-40 C [ -40 F ] and below (130 k )