Mitsubishi Electric PUHY-P168, Service Handbook, Page: 262 / 404

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[
IX
Troubleshooting ]
Refer to section -8- "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
Detail code
No. 05: Fan
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.
Error Code
Error definition and error
detection method
Cause Check method and remedy
5201 High pressure
sensor (out-
door unit) 1.If the high pressure
sensor detects
0.098MPa [14psi] or
less during the opera-
tion, the outdoor unit
stops once, turns to
anti-restart mode for 3
minutes, and restarts
after 3 minutes 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 outdoor unit
makes an error stop,
and the error code
"5201" will appear.
3.During 3-minute anti-
restart mode, prelimi-
nary errors will be dis-
played on the LED
display.
4.A error is not detected
for 3 minutes after the
compressor start, dur-
ing defrost operation,
or 3 minutes after de-
frost 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