McQuay MWM Service Manual page 74

MCQUAY Service Guide Book
Error Diagnosis by Wired Controller (MC301)
ITEM CODE DESCRIPTION
18 Sensor Broken (indoor outlet coil)
F3
19 Sensor Broken (indoor return air)
F4
20 Sensor Broken (indoor supply air)
F5
21 Indoor and controller communication malfunction
F6
22 Ambient temp exceed the limit
F7
23 4WV malfunction
F8
24 Refrigerant leakage
F9
25 Controller storage malfunction
FA
26 Water Pump (indoor water pump)
FB
27 Indoor and outdoor communication malfunction
FC
28 Master and slave communication malfunction
FE
29 Digital comp overload
H0
30 Fixed Comp1 overload
H1
31 Fixed Comp2 overload
H2
32 Fixed Comp3 overload
H3
33 High pressure too high
H4
34 Sensor broken, high pressure
H5
35 Discharge temp too high
H6
36 Super heat too low
L0
37 Low pressure too low
L1
38 Sensor broken, low pressure
L2
39 System malfunction
10
40 Sensor broken (slave TH1 discharge temp)
11
41 Sensor broken (slave TH2 inlet coil 1#)
12
42 Sensor Broken (slave TH3 mid coil 1#)
13
43 Sensor broken (slave TH4 inlet coil 2#)
14
44 Sensor broken (slave TH5 mid coil 2#)
15
45 Sensor broken (slave TH6 inlet coil 3#)
16
46 Sensor broken (slave TH7 mid coil 3#)
17
47 Sensor broken (slave TH8 ambient temp)
18
48 Sensor broken (slave TH9 outlet coil)
19
49 Sensor broken (slave TH10 subcool outlet)
1A
50 Sensor broken (slave TH11 subcool suction)
1B
51 Sensor Broken (slave TH12 suction)
1C
52 Emergency run (slave)
1F
53 Outdoor storage (slave)
20
54 Ambient temp exceed the limit (slave)
27
55 4WV malfunction (slave)
28
56 Refrigerant leakage (slave)
29
57 Digital comp overload (slave)
30
58 Fixed comp1 overload (slave)
31
59 Fixed comp2 overload (slave)
32
60 Fixed comp 3 overload (slave)
33
61 High pressure too high (slave)
34
62 Sensor broken, high pressure (slave)
35
63 Discharge temp too high (slave)
36
64 Super heat too low (slave)
40
65 Low pressure too low (slave)
41
66 Sensor broken, low pressure (slave)
42
73
Diagnosis