Mitsubishi Electric City Multi CMB-P1016NU-G, Service Handbook

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[
IX
Troubleshooting ]
Refer to section - 7- "Inverter " under part [4] "Trouble shooting principal parts" for error codes related to the inverter.
Error Code
Error definition and error
detection method
Cause Check method and remedy
5110 Heat sink fail-
ure
Detail code
No. 01: Com-
pressor INV
side When a short or an open
of THHS is detected just
before or during the in-
verter operation. (1) THHS sensor failure Check for short circuit in THHS sen-
sor.
(2) Contact failure Replace THHS sensor.
(3) Compressor INV board or
fan INV board failure
Replace compressor INV board or
fan INV board.
Temperature sensor failure (BC controller)
Error Code
Error definition and error
detection method
Cause Check method and remedy
5111 Liquid inlet
(TH11) 1.When a short (high
temperature inlet) or
an open (low tempera-
ture inlet) of the ther-
mistor is detected
during operation, an
error stop will be
made, and "5111",
"5112", "5115", or
"5116" will be dis-
played.
2.The short or open de-
scribed above is not
detected during de-
frost or 3 minutes after
the operation mode is
changed.
(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
failure on the main board
Check thermistor resistance.
Check lead wire.
Check for torn wire coating.
Check connector.
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.
5112 Bypass outlet
(TH12)
5115 LEV3 outlet
(TH15)
5116 LEV3 inlet
(TH16)
5201 High pressure
sensor (heat
source unit)
1. If the high pressure sensor
detects 0.098MPa [14psi]
or less during the opera-
tion, the heat source unit
stops once, turns to anti-
restart mode for 3 minutes,
and restarts after 3 min-
utes when the detected
high pressure sensor is
0.098MPa [14psi] or more.
2. If the high pressure sensor
detects 0.098MPa [14psi]
or less just before the re-
start, the heat source unit
makes an error stop, and
the error code "5201" will
appear.
3. During 3-minute anti-re-
start mode, preliminary er-
rors will be displayed on
the LED display.
4. A error is not detected for 3
minutes after the compres-
sor start, during defrost op-
eration, or 3 minutes after
defrost operation.
(1) High pressure sensor fail-
ure
Refer to the page on the trouble-
shooting of the high pressure sen-
sor.(9.[4].-1-)
(2) Pressure drop due to re-
frigerant leak
(3) Torn wire coating
(4) A pin on the male connec-
tor is missing or contact
failure
(5) Disconnected wire
(6) High pressure sensor input
circuit failure on the main
board
TH11
TH12
TH15
TH16
Short is detection Open detection
110 C [230 F ] and above (0.57 k )
110 C [230 F ] and above (0.4 k )
70 C [158 F ] and above (0.4 k )
110 C [230 F ] and above (1.14 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 )