Table Of Led Codes - Mitsubishi Electric PU(H)Y-P250YGM-A Service Handbook

4. Table of LED Codes

LED monitor display
SW
No
1234567890
0 0000000000
1 1000000000
2 0100000000
3 1100000000
4 0010000000
5 1010000000
6 0110000000
7 1110000000
8 0001000000
9 1001000000
10 0101000000
11 1101000000
12 0011000000
13 1011000000
14 0111000000
15 1111000000
Item
LD1 LD2
Relay out- Comp in Comp 1
put display 1 opera- in oper-
Lighting tion ation
Check (er-
ror) display 1 0000 to 9999 (Address and error codes highlighted)
OC/OS error
Check (er-
ror) display 2
OC/OS error
0000 to 9999 (Address and error codes highlighted)
Check (er-
ror) display 3
0000 to 9999 (Address and error codes highlighted)
(Including IC
and BC)
Relay out-
21S4a 21S4b
put display 2
Relay out-
SV1
put display 3
Relay out-
SV5b
put display 4
Special con- Retry
trol opera-
tion
Communica-
tion demand
capacity
Contact
point de-
mand ca-
pacity
External sig-
nal
(Open input
Night
contact
mode
point)
Outdoor unit
operation
status
Warm
up
mode
[ X LED Monitor Display on the Outdoor Unit Board ]
Display
LD3 LD4 LD5
Comp 2
in oper- 52C1
ation
21S4c CH11 CH12
SV3
SV5c
0000 to 9999
0000 to 9999
Cool- Cool-
ing- ing-
heating heating
Snow
change change
sensor
over over
(Cool- (Heat-
ing) ing)
20-sec- Com-
Prelimi-
onds re- pressor
nary er-
start in oper-
ror
mode ation
- 177 -
LD6 LD7 LD8
LD8 stays lit at
Always
52C2 all times while
lit
the power to the
microcomputer
is on.
Display of the
latest prelimi-
nary error
If no preliminary
errors are de-
tected, "----" ap-
pears on the
display.
If no errors are
detected, "----"
appears on the
display.
52F
If not demanded
controlled, "----"
[ % ] appears on
the display.
If not demanded
controlled, "----"
[ % ] appears on
the display.
20-sec-
Prelimi-
onds re-
nary
start
vacu-
after in-
Error um op-
stanta-
eration
neous
protec-
power
tion
failure
Remarks