Troubleshooting - McQuay MDS030A Manual

7 Troubleshooting

If the Followings Unit Malfunction Occurred, Please Follow the Below Simple Checking Step to Fix :
Symptom
Compressor stop and fan
work normally
Units do not work
Cooling or heating not
enough or too much
Remote controller unreadable
Condensing water in front
panel
• If user can not fix the problem, please contact the local service agent for assistance, meanwhile record
the malfunction code by remote controller and indication light of units self-checking function;
Fault Codes for MDSA/B Series
Item Code Description
1 E0 System malfunction
2 E1 Sensor broken(TH1 discharge temp)
3 E2 Sensor broken(TH2 inlet coil 1#)
4 E3 Sensor broken(TH3 mid coil 1#)
5 E4 Sensor broken(TH4 inlet coil 2#)
6 E5 Sensor broken(TH5 mid coil 2#)
7 E6 Sensor broken(TH6 inlet coil 3#)
8 E7 Sensor broken(TH7 mid coil 3#)
9 E8 Sensor broken(TH8 ambient temp..)
10 E9 Sensor broken(TH9 outlet coil)
11 EA Sensor broken(TH10 subcool outlet)
Sensor broken(TH11
12 EB
subcool suction)
13 EC Sensor broken(suction)
14 EF Emergency run
15 F0 Outdoor storage malfunction
16 F1 Sensor broken(indoor inlet coil)
17 F2 Sensor broken(indoor mid coil)
18 F3 Sensor broken(indoor outlet coil)
19 F4 Sensor broken(indoor return air )
20 F5 Sensor broken(indoor supply air)
Indoor and controller
21 F6
communication malfunction
22 F7 Ambient temp. exceed the limit
Indication Light Twinkle Related to Malfunction Code:
Type Heat Fan
Sensor, outdoor F F
Sensor, indoor F F
System failure F F
Analyses
Indoor temperature is higher (heating) or lower (cooling) than
setting temperature
When heating and defrost mode, indoor unit is just running
Power is not on
Set up the re-start function
Fuse broken in main power supply
Air filter too dirty
Return air barrier
Low battery
Wrong installation of battery
Humidity too high
Setting temperature too low
Item Code
23 F8 4wv malfunction
24 F9 Refrigerant leakage
25 FA Controller storage malfunction
Water pump(indoor drain
26 FB
pump)
Indoor and outdoor
27 FC
communication malfunction
Master and slave
28 FE
communication malfunction
29 H0 Digital comp overload
30 H1 Fixed comp1 overload
31 H2 Fixed comp2 overload
32 H3 Fixed comp3 overload
33 H4 High pressure too high
34 H5 Sensor broken, high pressure
35 H6 Discharge temp. too high
36 L0 Super heat too low
37 L1 Low pressure too low
38 L2 Sensor broken, low pressure
39 10 System malfunction
Sensor broken(slave
40 11
TH1 discharge temp.)
Sensor broken(slave
41 12
TH2 inlet coil 1#)
Sensor broken(slave
42 13
TH3 mid coil 1#)
Sensor broken(slave
43 14
TH4 inlet coil 2#)
Sensor broken(slave
44 15
TH5 mid coil 2#)
Dry Cool Type
F F Pump, indoor
Over load,
F On
compressor
F Off Pressure sensor, outdoor
Description Item Code
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
Heat Fan Dry Cool
F F On F
F F On On
F F On Off
page 41
Solution
Re – set up the temperature
Waiting for 10minutes
Check and connect the power
Wait or cancel timer on
Replace the fuse
Clean or replace the filter
Remove the barrier
Replace the battery
Install properly
Dehumidify
Set up the higher indoor temperature
Description
16 Sensor broken(slave TH6 inlet coil 3#)
Sensor broken(slave
17
TH7 mid coil 3#)
Sensor broken(slave
18
TH8 ambient temp.)
Sensor broken(slave
19
TH9 outlet coil)
Sensor broken(slave
1A
TH10 subcool outlet)
Sensor broken(slave TH11 subcool
1B
suction)
Sensor broken(slave
1C
TH12 suction)
1F Emergency run
20 Outdoor storage malfunction
27 Ambient temp.. exceed the limit
28 4wv malfunction
29 Refrigerant leakage
30 Digital comp overload
31 Fixed comp1 overload
32 Fixed comp2 overload
33 Fixed comp3 overload
34 High pressure too high
35 Sensor broken, high pressure
36 Discharge temp. too high
Super heat too low
40
41 Low pressure too low
42 Sensor broken, low pressure
Type Heat Fan
Pressure high/low F
Communication F
Others F
Dry Cool
F Off Off
off F F
off F On