Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 316

4. Table of LED Codes
LED monitor display
SW
No
1234567890
Relay out-
put display 1
Lighting
0 0000000000
Check (er-
ror) display 1
OC error
Check (er-
ror) display 2
OC error
1 1000000000
Check (er-
ror) display 3
2 0100000000
(Including IC
and BC)
Relay out-
put display 2
3 1100000000
Relay out-
4 0010000000
put display 3
Relay out-
5 1010000000
put display 4
Relay out-
6 0110000000
put display 5
7 1110000000
8 0001000000
Communica-
tion demand
9 1001000000
capacity
Contact
point de-
10 0101000000
mand ca-
pacity
External sig-
nal
11 1101000000 (Open input
contact
point)
External sig-
nal
12 0011000000
13 1011000000
Heat source
unit opera-
tion status
14 0111000000
15 1111000000
Item
LD1 LD2 LD3
Comp in Comp 1
opera- in oper-
tion ation
0000 to 9999 (Address and error codes highlighted)
0000 to 9999 (Address and error codes highlighted)
0000 to 9999 (Address and error codes highlighted)
21S4a
SV1
SV7a SV7b SV7c
Contact
Night Snow
point
mode sensor
demand
During
pump
inter-
lock op-
eration
*BC op- 3-min-
Warm
eration utes re-
up
com- start
mode
mand mode
- 307 -
[ X LED Monitor Display on the Heat Source Unit Board ]
Display
LD4 LD5 LD6 LD7
52C
CH11
*SV4a *SV4b *SV4c
*SV4d
0000 to 9999
0000 to 9999
3-min-
utes re-
Com- start
Prelimi-
pressor after in-
nary er- Error
in oper- stanta-
ror
ation neous
power
failure
Remarks
LD8
LD8 stays lit at
Always
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.
Items marked
with * are only
applicable to the
PQRY series.
If not demanded
controlled, "----"
[ % ] appears on
the display.
If not demanded
controlled, "----"
[ % ] appears on
the display.
Items marked
with * are only
applicable to the
PQRY series.
Prelimi-
nary low
pres-
sure er-
ror