Troubleshooting - McQuay MDS030A Design & Installation Manual

C H A P T E R
7
Fault Codes and Troubleshooting
7.1 Fault codes here refer to the codes that appear on the remote control.
If a host computer is available, the fault cause is directly displayed.
7.1.1 Fault codes for MDS-A/B series
No. Fault code
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
Description
E0 System malfunction
E1 Sensor broken(TH1 discharge temp)
E2 Sensor broken(TH2 inlet coil 1#)
E3 Sensor broken(TH3 mid coil 1#)
E4 Sensor broken(TH4 inlet coil 2#)
E5 Sensor broken(TH5 mid coil 2#)
E6 Sensor broken(TH6 inlet coil 3#)
E7 Sensor broken(TH7 mid coil 3#)
E8 Sensor broken(TH8 ambient temp..)
E9 Sensor broken(TH9 outlet coil)
EA Sensor broken(TH10 subcool outlet)
EB Sensor broken(TH11 subcool suction)
EC Sensor broken(suction)
EF Emergency run 36 L0 Super heat too low
F0 Outdoor storage malfunction
F1 Sensor broken(indoor inlet coil)
F2 Sensor broken(indoor mid coil)
F3 Sensor broken(indoor outlet coil)
F4 Sensor broken(indoor return air )
F5 Sensor broken(indoor supply air)
F6 Indoor and controller communication malfunction
F7 Ambient temp. exceed the limit
F8 4wv malfunction
F9 Refrigerant leakage
FA Controller storage malfunction
FB Water pump(indoor drain pump)
FC Indoor and outdoor communication malfunction
FE Master and slave communication malfunction
H0 Digital comp overload
H1 Fixed comp1 overload
H2 Fixed comp2 overload
H3 Fixed comp3 overload
H4 High pressure too high
No. Fault code Description
34 H5 Sensor broken, high pressure
35 H6 Discharge temp. too high
36 L0 Protection for too small degree of overheat
37 L1 Low pressure too low
38 L2 Sensor broken, low pressure
39 10 System malfunction
40 11 Sensor broken(slave TH1 discharge temp.)
41 12 Sensor broken(slave TH2 inlet coil 1#)
42 13 Sensor broken(slave TH3 mid coil 1#)
43 14 Sensor broken(slave TH4 inlet coil 2#)
44 15 Sensor broken(slave TH5 mid coil 2#)
45 16 Sensor broken(slave TH6 inlet coil 3#)
46 17 Sensor broken(slave TH7 mid coil 3#)
47 18 Sensor broken(slave TH8 ambient temp.)
48 19 Sensor broken(slave TH9 outlet coil)
49 1A Sensor broken(slave TH10 subcool outlet)
50 1B Sensor broken(slave TH11 subcool suction)
51 1C Sensor broken(slave TH12 suction)
52 1F Emergency run
53 20 Outdoor storage malfunction
54 27 Ambient temp.. exceed the limit
55 28 4wv malfunction
56 29 Refrigerant leakage
57 30 Digital comp overload
58 31 Fixed comp1 overload
59 32 Fixed comp2 overload
60 33 Fixed comp3 overload
61 34 High pressure too high
62 35 Sensor broken, high pressure
63 36 Discharge temp. too high
64 40 Super heat too low
65 41 Low pressure too low
66 42 Sensor broken, low pressure