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

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[
X
LED Monitor Display on the Heat Source Unit Board ]
4. Table of LED Codes
LED monitor display
No
SW
Item
Display
Remarks
1234567890 LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8
0 0000000000
Relay out-
put display 1
Lighting Comp in
opera-
tion
Comp 1
in oper-
ation
52C
Always
lit
LD8 stays lit at
all times while
the power to the
microcomputer
is on.
Check (er-
ror) display 1
OC error
0000 to 9999 (Address and error codes highlighted)
1 1000000000
Check (er-
ror) display 2
OC error
0000 to 9999 (Address and error codes highlighted)
Display of the
latest prelimi-
nary error
If no preliminary
errors are de-
tected, "----" ap-
pears on the
display.
2 0100000000
Check (er-
ror) display 3
(Including IC
and BC)
0000 to 9999 (Address and error codes highlighted)
If no errors are
detected, "----"
appears on the
display.
3 1100000000
Relay out-
put display 2
21S4a CH11
Items marked
with * are only
applicable to the
PQRY series.
4 0010000000
Relay out-
put display 3
SV1 *SV4a *SV4b *SV4c
5 1010000000
Relay out-
put display 4
*SV4d
6 0110000000
Relay out-
put display 5
SV7a SV7b SV7c
7 1110000000
8 0001000000
9 1001000000
Communica-
tion demand
capacity
0000 to 9999
If not demanded
controlled, "----"
[ % ] appears on
the display.
10 0101000000
Contact
point de-
mand ca-
pacity
0000 to 9999
If not demanded
controlled, "----"
[ % ] appears on
the display.
11 1101000000
External sig-
nal
(Open input
contact
point)
Contact
point
demand
Night
mode
Snow
sensor
Items marked
with * are only
applicable to the
PQRY series.
12 0011000000
External sig-
nal During
pump
inter-
lock op-
eration
13 1011000000
14 0111000000
Heat source
unit opera-
tion status
*BC op-
eration
com-
mand
Warm
up
mode
3-min-
utes re-
start
mode
Com-
pressor
in oper-
ation
Prelimi-
nary er-
ror
Error
3-min-
utes re-
start
after in-
stanta-
neous
power
failure
Prelimi-
nary low
pres-
sure er-
ror
15 1111000000
Current data