Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 208

Error definition and error
Error Code
5110 Heat sink fail- When a short or an open
ure of THHS is detected just
Detail code before or during the in-
No. 01: Com- verter operation.
pressor INV
side
Refer to section -7- "Inverter " under part [4] "Trouble shooting principal parts" for error codes related to the inverter.
Error definition and error
Error Code
5201 High pressure 1. If the high pressure
sensor (heat
source unit)
2. If the high pressure
3. During 3-minute anti-
4. A error is not detected
detection method
(1) THHS sensor failure
(2) Contact failure
(3) Compressor INV board
failure
detection method
(1) High pressure sensor fail-
sensor detects ure
0.098MPa [14psi] or
less during the opera-
(2) Pressure drop due to re-
tion, the heat source
frigerant leak
unit stops once, turns
to anti-restart mode
(3) Torn wire coating
for 3 minutes, and re-
(4) A pin on the male connec-
starts after 3 minutes
tor is missing or contact
when the detected
failure
high pressure sensor
is 0.098MPa [14psi] or
(5) Disconnected wire
more.
(6) High pressure sensor input
circuit failure on the main
sensor detects
board
0.098MPa [14psi] or
less just before the re-
start, the heat source
unit makes an error
stop, and the error
code "5201" will ap-
pear.
restart mode, prelimi-
nary errors will be dis-
played on the LED
display.
for 3 minutes after the
compressor start, dur-
ing defrost operation,
or 3 minutes after de-
frost operation.
- 199 -
Cause Check method and remedy
Check for short circuit in THHS sen-
sor.
Replace THHS sensor.
Replace the compressor INV board
Cause Check method and remedy
Refer to the page on the trouble-
shooting of the high pressure sen-
sor. (9 [4] -1-)
[ IX Troubleshooting ]