McQuay MWM Service Manual page 75

MCQUAY Service Guide Book
(B) Outdoor Units
Model
MDS 30/40/50/60/70 A/AR
MDS 80/100/120/150/180/200/240/
260/300/320 B/BR
5MDS 80/100/120/140/160/180/
200/220/240/260/280/300/320/340/360
/380/400/420/440/460/480/500 B/BR
Error code diagnosis by PCB four Digit 7-Segment
MDS-A Series:
ITEM CODE DESCRIPTION
1 Discharge temperature sensor malfunction
E0
2 Outdoor ambient temperature sensor malfunction
E1
3 Suction temperature sensor malfunction
E2
4 Compressor base temperature sensor malfunction
E3
5 Coil inlet temperature sensor malfunction
E4
6 Coil middle temperature sensor malfunction
E5
7 Coil outlet temperature sensor malfunction
E6
8 Compressor discharge temperature too high > 130⁰C
E7
9 General system failure
E8
10 High pressure trip
H1
11 Digital scroll compressor overload
H2
12 Fixed scroll compressor overload
H3
13 Low pressure trip
L1
14 Communication failure between outdoor and all indoors
C-
15 "X" indoor no. Particular indoor no communication
CX
MDS-B Series:
ITEM CODE DESCRIPTION
0 00## indoor unit communication
EC00
1 01# indoor unit communication
EC01
failure
2~47 02~47# indoor unit communication
....
failure
48 Digital Compressor Overload
ER48
49 Fix 1 Compressor Overload
ER49
50 Fix 2 Compressor Overload
ER50
51 Fix 3 Compressor Overload
ER51
52 Discharge pressure too high
ER52
53 Suction pressure is too low
ER53
54 Outdoor unit's IC error
ER54
55 System Error
ER55
56 Discharge temperature is too high
ER56
57 -
ER57
58 4 way valve failure
ER58
59 Ambient temperature is beyond the
ER59
limit
60 Emergency run
ER60
61 Sub heating is beyond the limit
ER61
For item 0-47, the last two characters indicate which indoor has communication problem.
Board Handset
V4.0 – V4.5 G17/ MC301
V2.0 – V2.7 G17/ MC301
V2.1A – V2.6A G17/ MC301
ITEM
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
74
CODE DESCRIPTION
Refrigerant released
ER62
Slaver outdoor unit communication
ER63
failure
TH1 temperature sensor failure
ER64
TH2 temperature sensor failure
ER65
TH3 temperature sensor failure
ER66
TH4 temperature sensor failure
ER67
TH5 temperature sensor failure
ER68
TH6 temperature sensor failure
ER69
TH7 temperature sensor failure
ER70
TH8 temperature sensor failure
ER71
TH9 temperature sensor failure
ER72
TH10 temperature sensor failure
ER73
TH11 temperature sensor failure
ER74
TH12 temperature sensor failure
ER75
Discharge pressure sensor failure
ER76
Suction pressure sensor failure
ER77
All indoor units Communication
EC78
Failure
Diagnosis