0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0000000000
1000000000
0100000000
1100000000
0010000000
1010000000
0110000000
1110000000
0001000000
1001000000
0101000000
1101000000
0011000000
1011000000
0111000000
1111000000
0000100000
1000100000
0100100000
1100100000
0010100000
[3] LED Monitor Display
E: E2 Contents stored in the E2PROM; M: Monitored by the IC through communications; E*: Stored in service memory.
COMP
Operat-
ing
Unit
No. 1
Unit
No. 9
Unit
No. 1
Unit
No. 9
Unit
No. 1
Unit
No. 9
Permissible
Stop
Cooling
Refrigerant
Recovery
High
Pressure
Error 1, 2
Suction
Pressure
Error
TH1
Error
TH7
Error
No SW1 Item Display Remarks
12345678910 LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8
Relay Output
Display 1 (Lights
up to display)
Check Display 1
OC Error
Relay Output
Display 2
Check Display 2
(Including the IC)
Outdoor Unit
Operation Display
Indoor Unit Check
Indoor Unit
Operation Mode
Indoor Unit
Thermostat
Outdoor Unit
Operation Mode
Outdoor Unit
Control Mode
Error Delay in
Outdoor Unit
Crank-
case
Heater
Packet
being
sent
Unit
No. 2
Unit
No. 10
Unit
No. 2
Unit
No. 10
Unit
No. 2
Unit
No. 10
Standby
Configuration
Detection
Error
TH2
Error
TH8
Error
21S4✻
3 minutes,
restart
Unit
No. 3
Unit
No. 11
Unit
No. 3
Unit
No. 11
Unit
No. 3
Unit
No. 11
Defrost-
ing
Heating
Refrigerant
Recovery
Outlet
Tempera-
ture Error
SV1
Compres-
sor
operating
Unit
No. 4
Unit
No. 12
Unit
No. 4
Unit
No. 12
Unit
No. 4
Unit
No. 12
Cooling
Overcurrent
Protection
Reverse
Phase, Open
Phase Error
SV2
Prelimi-
nary
Error
Unit
No. 5
Unit
No. 13
Unit
No. 5
Unit
No. 13
Unit
No. 5
Unit
No. 13
Cooling
High Oil
Recovery
Heat Sink
Thermostat
Operating
TH5
Error
Lights for
Normal
Operation
Unit
No. 8
Unit
No. 16
Unit
No. 8
Unit
No. 16
Unit
No. 8
Unit
No. 16
Heating
Low Oil
Recovery
Refrigerant
Over-
charge
THHS
Error
LD8 is a relay output indicator which
lights u at all times when the
microcomputer’s power is ON.
When sending of a monitoring re-
quest to IC/BC is terminated, if there
is no error, “- - - -” is displayed. E
✻
*only for PUHY
E✻
If there is no error,
“- - - -” is displayed. E✻
E✻
E✻
Lights up if an abnormal stop
has occurred in the IC. The
indicator for Unit No. 1 goes off
when error reset is carried out
from the smallest address. M
Lights up during
cooling.
Blinks during heating.
Goes off during stop
and blower operation. M
Lights up when
thermostat is ON.
Goes off when
thermostat is OFF.
M
E✻
The flag correspond-
ing to the item where
there is an error
delay lights up. E✻
0 ~ 9999
Address and error code reversed
SSR
Unit
No. 7
Unit
No. 15
Unit
No. 7
Unit
No. 15
Unit
No. 7
Unit
No. 15
Heating
High Oil
Recovery
INV
Error
HPS
Error
0 ~ 9999
Address and error code reversed
Error
Unit
No. 6
Unit
No.14
Unit
No. 6
Unit
No.14
Unit
No. 6
Unit
No.14
Heating
Cooling
Low Oil
Recovery
Overcurrent
Break
TH6
Error
-
83
-