Mitsubishi Electric PUH-P8YE Technical & Service Manual page 30

<Outdoor unit operation monitoring function>
The operation status and check code contents can be ascertained by means of the 2-digit number and symbol on digital
display light emitting diode LED2 by operating DIP switch SW2.
<Description of operation of digital display light emitting diode (LED2)>
• When ON (normal operation): Displays the operation mode.
[Tens digit: Operation mode]
Display Operation mode
O stopped
C Cooling/Dry
H Heating
d Defrost
• When blinking (Operation stopped by tripping protection device): Displays the check mode
Display Check unit
0 Outdoor unit
1 Indoor unit 1
2 Indoor unit 2
3 Indoor unit 3
4 Indoor unit 4
• PUH-P8YE/P10YE
Display
U2 Compressor discharge temperature abnormal, CN23 short-circuit connector unplugged
U3 Compressor discharge temp thermistor (TH2) open/short
U4 Liquid temp thermistor (TH1), Condenser/evaporater temp thermistor (TH3) open/short
U6 Compressor overcurrent protection trip (51C trip)
UE High pressure protection (63H1 trip)
UL Low pressure protection (63L trip)
P1-P8 Indoor unit abnormal
A0-A8 M-NET communication abnormal
ON
LED2
[Units digit: Relay output]
Display
0
1
2
3
4
5
6
7
Display
E8 Indoor-outdoor communication receive abnormal (outdoor unit)
E9 Indoor-outdoor communication send abnormal (outdoor unit)
Indoor/outdoor connection erroneous wiring, number of indoor
EA
units mismatch
Indoor/outdoor connection erroneous wiring (indoor unit power
Eb
failure, disconnection)
Ed Serial communication abnormal (M-NET)
E0-E7 Communication other than outdoor unit abnormal
F8 Input circuit faulty
Check contents (operating)
–28–
SW2
1 2 3 4 5 6
ON
OFF
(Load status)
Compressor 4-way valve
– –
– –
– ON
– ON
ON –
ON –
ON ON
ON ON
Check contents (at power on)
Bypass solenoid valve
–
ON
–
ON
–
ON
–
ON