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5.0 McQuay Troubleshooting

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5.0 McQuay Troubleshooting
MCQUAY DIGITAL SCROLL SYSTEM
Troubleshooting
Page 1
SELF DIAGNOSIS
MDS Outdoor Unit
Page 2
SELF DIAGNOSIS
MDS Outdoor Unit
 Compressor Protection
 High & low pressure
switch / Sensor
 Overload protection input
from compressor
B Series
A Series
LS
Yes
No
HS
150~300
No
LP
No
Yes
LS - Low Pressure Sensor
HS - High Pressure Sensor
LP - Low Pressure Switch (0.05 Mpa / 7.25psi)
HP - High Pressure Switch (2.80 Mpa / 406psi)
Pressure Swtich Setting is Factory Preset, not
adjustable
Page 3
HP
Yes
Yes
 Monitoring Point
(Temperature Sensor)
 Compressor Discharge
 Compressor Suction
 Ambient Temperature
 Coil Inlet
 Coil
 Coil Outlet
 Compressor
SELF DIAGNOSIS
7 segment display on outdoor PCB
ITEM CODE DESCRIPTION
1
E0 Outdoor DLT Discharge Sensor Error
2
E1 Outdoor OD Ambient Sensor Error
3
E2 Outdoor RTN Return Air Sensor Error
4
E3 Sump Sensor Error
5
E4 Outdoor Inlet Sensor Error
6
E5 Outdoor Midlet Sensor Error
7
E6 Outdoor Outlet Sensor Error
8
E7 Outdoor DLT Discharge Sensor Error
9
E8 System Error
10
EE Conflict of Mode Setting
11
E9 Network Communication Error
12
F1 Indoor Room Sensor Error
Page 4
ITEM CODE DESCRIPTION
13
F2 Indoor Inlet Sensor Error
14
F3 Indoor Midlet Sensor Error
15
F4 Indoor Outlet Sensor Error
16
F5 Communication Error between Indoor and Wired Controller
17
F6 Wired Controller IC Error
18
F7 Wired Controller Clock Error
19
F8 Communication Error between Indoor and Outdoor
20
F9 Outdoor IC Error
21
H1 Compressor High Pressure Error
22
H2 Digital Compressor Overload
23
H3 Fixed Compressor Overload
24
L1 Compressor Low Pressure Error
SELF DIAGNOSIS
7 Segment Display on outdoor PCB
Indicator Code
LETTER
1
A
2
B
3
C
4
D
5
E
6
F
7
H
9
N
10
O/0
11
P
12
R
13
T
14
U
15
Y
SIGN
LETTER
SIGN
Page 5
8
L
SELF DIAGNOSIS
LED of outdoor PCB
ERROR Code
ITEM
0
1
2~47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
CODE
EC00
EC01
…
ER48
ER49
ER50
ER51
ER52
ER53
ER54
ER55
ER56
ER57
ER58
ER59
ER60
ER61
Page 6
DESCRIPTION
00# indoor unit Communication failure
01# indoor unit Communication failure
02~47# indoor unit Communication failure
Digital compressor Overload
Fix 1 compressor Overload
Fix 2 compressor Overload
Fix 3 compressor Overload
Discharge pressure is too high
Suction pressure is too low
Outdoor unit's IC Error
System Error
Discharge temperature is too high
4 way valve failure
Ambient temperature is beyond the limit
Emergency Runing
Subheating is beyond the limit
ITEM
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
CODE
ER62
ER63
ER64
ER65
ER66
ER67
ER68
ER69
ER70
ER71
ER72
ER73
ER74
ER75
ER76
ER77
EC78
DESCRIPTION
Refrigerant released
Slaver outdoor unit Communication failure
TH1 temperature sensor failure
TH2 temperature sensor failure
TH3 temperature sensor failure
TH4 temperature sensor failure
TH5 temperature sensor failure
TH6 temperature sensor failure
TH7 temperature sensor failure
TH8 temperature sensor failure
TH9 temperature sensor failure
TH10 temperature sensor failure
TH11 temperature sensor failure
TH12 temperature sensor failure
Discharge pressure sensor failure
Suction pressure sensor failure
All indoor units Communication failure
SELF DIAGNOSIS
MDS Indoor Unit
 Temperature Sensor
 Coil Inlet
 Coil
 Coil Outlet
 Return air
Page 7
SELF DIAGNOSIS
ERROR Code
ITEM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Page 8
CODE
E0
E1
E2
E3
E4
E5
E6
E7
E8
E9
EA
EB
EC
EF
F0
F1
F2
F3
F4
F5
F6
F7
LCD Indicator of controller
ITEM CODE
DESCRIPTION
ITEM CODE DESCRIPTION
DESCRIPTION
45 malfunction
16
Sensor broken(slaveTH6 inlet coil 3#)
23
F8
4wv
System
malfunction
46 discharge
17 leakage
Sensor broken(slaveTH7 mid coil 3#)
24
F9
Refrigerant
Sensor
broken
(TH1
temp.)
47 inlet coil
18
broken(slaveTH8 ambient temp)
25
FA (TH2
Controller
storage
malfunction
Sensor
broken
1#) Sensor
48 midpump(indoor
19 1#) Sensor
outlet coil)
26
FB (TH3
Water
drainbroken(slaveTH9
pump)
Sensor
broken
coil
49 inletand
1Aoutdoor
broken(slaveTH10subcool
outlet)
27
FC (TH4
Indoor
communication
malfunction
Sensor
broken
coil
2#) Sensor
50 mid coil
1B 2#) and
Sensor
( slave TH11
subcool suction)
28
FE
Outdoor
master
slavebroken
communication
malfunction
Sensor
broken
(TH5
51 inletcomp
1C 3#)
Sensor broken(slaveTH12 suction)
29
H0
Digital
overload
Sensor
broken
(TH6
coil
52 mid
1F 3#)
Emergency run(slave)
30
H1
Fixed
comp1
overload
Sensor
broken
(TH7
coil
53 ambient
20 temp)
Outdoor storage malfunction(slave)
31
H2
Fixed
comp2
overload
Sensor
broken
(TH8
54 outlet
27
Ambient temp exceed the limit(slave)
32
H3
Fixed
comp3
Sensor
broken
(TH9
coil)overload
55 pressure
28 outlet)
33
H4
High
too4wv
highmalfunction(slave)
Sensor
broken
(TH10subcool
56
29 suction)
Refrigerant
34
H5
Sensor
broken,
high
pressureleakage(slave)
Sensor
broken(TH11subcool
57 suction)
30temp too
Digital
35
H6
Discharge
highcomp overload(slave)
Sensor
broken
(TH12
58
31 too low
Fixed comp1overload(slave)
36
L0 run Super
heat
Emergency
59 pressure
32 tooFixed
37
L1
Low
low comp2 overload(slave)
Outdoor
storage
malfunction
60 inlet
33coil) low
Fixed
comp3 overload(slave)
38
L2
Sensor
broken,
pressure
Sensor
broken
(indoor
61 midmalfunction
34
39
10
System
Sensor
broken
(indoor
coil) High pressure too high(slave)
62 outlet
35 coil) Sensor broken,
high
pressure(slave)
40
11
Sensor
broken(slaveTH1
discharge
temp)
Sensor
broken
(indoor
63 return
36 air ) Discharge
temp
41
12
Sensor
broken(slaveTH2
inlet
coiltoo
1#)high(slave)
Sensor
broken
(indoor
64 supply
40 air) Super heat
42
13
Sensor
broken(slaveTH3
midtoo
coillow(slave)
1#)
Sensor
broken
(indoor
65 communication
41
Low
pressure
too2#)
low(slave)
43
14controller
Sensor
broken(slaveTH4
inlet coil
Indoor
and
malfunction
66 thebroken(slaveTH5
42
Sensor broken,
44
15 exceed
Sensor
mid coil low
2#) pressure(slave)
Ambient
temp
limit
SELF DIAGNOSIS
ERROR Code
LED Indicator of Receiver
Indication light twinkle related to malfunction code :
ITEM
1
2
3
4
5
6
7
8
9
Type
Indoor sensor error
Indoor pump error
Communication error
Outdoor sensor error
Compressor overload
Pressure switch trip
Pressure sensor error
System failure
Others
LED ON
LED OFF
LED BLINK
Page 9
Heat
Sleep/Fan
Dry
TROUBLESHOOTING
Frequent Malfunction for Commissioning – Communication Error
Symptom:
For A series Outdoor, the 7 segment display CFor B series Outdoor, the 7 segment display EC78
For Wired Handset, the LCD panel display FC
For LED Display, the Heat LED will be blinking
Potential Caused A:
The communication chip MAX485 of outdoor unit is damaged
(Possibility is low. The Communication is tested before ship out)
Solution: To replace the MAX485 chip
Potential Caused B:
The communication wires A/B get crossed each other or not connected
(Most common caused)
Solution: Check on all wiring. Ensure proper tighten and the polarity is consistent.
Page 10
TROUBLESHOOTING
Frequent Malfunction for Commissioning – Communication Error (cont’)
Potential Caused C:
Shielding wire is connected to ground terminal (not grounded).
(Long wiring and running the communication wire together with power supply wire
will cause this to happen)
Solution: Ensure the shielding wire is only grounded at the outdoor unit. Do not
run the communication wire with the power supply wire together.
Potential Caused D:
Address of indoor are wrongly set
(Caution, the indoor address must be start at ‘0000’ and follow. Do no jump the
number.)
Solution: Make sure the address start from ‘0000, did not skip any address and no
repetition.
Page 11
TROUBLESHOOTING
Frequent Malfunction for Commissioning – Specific Indoor
Communication Error
Symptom:
For A series Outdoor, the 7 segment display CX (X – Indoor Unit Number)
For B series Outdoor, the 7 segment display ECXX (XX – Indoor Unit Number)
For Wired Handset, the LCD panel display FC
For LED Display, the Heat LED will be blinking
Example:
For A series Outdoor, the 7 segment display C3
(Indoor Unit Number 4 not communicating)
For B series Outdoor, the 7 segment display EC03
(Indoor Unit Number 4 not communicating)
Page 12
TROUBLESHOOTING
Frequent Malfunction for Commissioning – Specific Indoor Communication
Error (cont’)
Potential Caused A:
Indoor Unit PCB has no power supply.
(Possible the power supply to the indoor had been turned off)
Solution: Check the power supply of the indoor power.
Potential Caused B:
Indoor Unit address error.
(Possible the indoor address is not set or duplication)
Solution: Check the indoor model address.
Page 13
TROUBLESHOOTING
Frequent Malfunction for Commissioning – Specific Indoor Communication
Error (cont’)
Potential Caused C:
Indoor Unit PCB malfunction.
(Possibility is low. PCB communication is tested before ship out.)
Solution: Replace with another PCB and check the communication
Potential Caused D:
Wrong quantity of indoor set.
(Possible the quantity of indoor unit set in the outdoor PCB is not tally with the
actual indoor quantity)
Solution: Check the quantity of indoor unit setting at the outdoor PCB.
Page 14
TROUBLESHOOTING
If the followings malfunction occurred, please follow the steps below to resolve :
Symptom
Compressor stop and fan
work normally
Units do not work
Cooling or heating not
enough
Remote controller
unreadable
Page 15
Possible Caused
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
Fuse broken in main power supply
Air filter too dirty
Return air barrier
Low battery
Wrong installation of battery
Solution
Change the set temperature
Wait for the defrost cycle to finish
Check and connect the power
Replace the fuse
Clean or replace the filter
Remove the barrier
Replace the battery
Install properly
Thank You
Page 16
Fly UP