©2008 McQuay International
7
● When the outdoor units are running, the operating mode was displayed on the PCB board of outdoor controller, it can also display malfunction
code. The following is the denotation of the code displayed in PCB board.
Code Denotation Code Denotation Code Denotation
0/O
8
H
1
9
L
2
A
N
3
B
P
4
C
R
5/S
D
T
6
E
U
7
F
Y
Code
Description Code
Description Code
Description Code
Description
NULL：outdoor unit stand-by
CSP：
outdoor in the course cooling
stop
HST：outdoor starting to heat
PROT:
malfunction protection
REST：outdoor unit resting
DST：outdoor starting to defrost
HEAT: outdoor/indoor heating
TEST:
testing mode
CST：outdoor starting to cool
DEF：outdoor/indoor defrosting
HSP ：
heating stop
OPEN: open all EXV
COOL：outdoor/indoor cooling
DSP：
outdoor in the course defrost
stop
ERRO:
malfunction
Othe: Other mode
The table of the malfunction code and description：
Item Code Description Item
Code Description
0 EC00 0#indoor and outdoor communication malfunction 65
ER65
Sensor broken（TH2 inlet coil 1#）
1~47 ECXY XY# indoor and outdoor communication malfunction 66
ER66
Sensor broken（TH3 mid coil 1#）
48 ER48 Digital comp overload 67
ER67
Sensor broken（TH4 inlet coil 2#）
49 ER49 Fix comp1 overload 68
ER68
Sensor broken（TH5 mid coil 2#）
50 ER50 Fix comp2 overload 69
ER69
Sensor broken（TH6 inlet coil 3#）
51 ER51 Fix comp3 overload 70
ER70
Sensor broken（TH7 mid coil 3#）
52 ER52 Discharge pressure too high 71
ER71
Sensor broken（TH8 ambient temp.）
53 ER53 Suction pressure too low 72
ER72
Sensor broken（TH9 outlet coil）
54 ER54 Outdoor storage malfunction 73
ER73
Sensor broken（TH10 subcool inlet）
55 ER55 System malfunction 74
ER74
Sensor broken（TH11 subcool outlet）
56 ER56 Discharge temp. too high 75
ER75
Sensor broken（TH12 suction temp.）
57 ER57 Indoor and outdoor communication malfunction 76
ER76 Discharge pressure sensor malfunction
58 ER58 Water temp. too high or low 77
ER77 Suction pressure sensor malfunction
59 ER59 Ambient temp. exceed the limit 78
EC78 All indoor and outdoor communication malfunction
60 ER60 Emergency run 79
ERSE Inexistent model
61 ER61 Super heat too low 80
R22
Miss feedback wiring or program misused for
R410A unit
62 ER62 Insufficient water flow 81
R410 false feedback wiring or program misused for
R22 unit
63 ER63 Slave communication malfunction
82
EC79 Outdoor unit and elec. power dist.
communication malfunction
64 ER64 Sensor broken (TH1 discharge temp.)
83
EC80 Ammeter and elec. power dist. communication
malfunction
Note: ”XY” in “ECXY” means “No.XY” indoor unit.
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