McQuay MDS Service Manual

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

McQuay MDS Specifications

General

Brand	McQuay
Model	MDS
Category	Air Conditioner
Language	English