142 143
_TROUBLE SHOOTING GUIDE BOOK _
- 159 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
• Defective temperature sensor connection
• Defective temperature sensor
(Open/Short)
• Defective outdoor unit PCB
Error No. Error type Error point Main reasons
Abnormal value of sensor
measurement (Open / Short)
HR unit liquid pipe tem-
perature sensor error
201C#HR
• Defective temperature sensor connection
• Defective temperature sensor
(Open/Short)
• Defective outdoor unit PCB
Error No. Error type Error point Main reasons
Abnormal value of sensor
measurement(Open / Short )
HR unit
Sub-cooling inlet pipe
temperature sensor
error
202C#HR
• Defective temperature sensor connection
• Defective temperature sensor
(Open/Short)
• Defective outdoor unit PCB
Error No. Error type Error point Main reasons
Abnormal value of sensor
measurement(Open / Short)
HR unit
Sub-cooling discharge
pipe temperature sensor
error
203C#HR
n
Error diagnosis and countermeasure flow chart
n HR unit error display No.
n
Example of HR unit error display.
1) Check connection condition of temperature sensor and lead cable
2) Is value of temperature sensor normal? If not replace sensor
- Piping temperature sensor : 10°C = 10kΩ : 25°C= 5kΩ : 50°C= 1.8kΩ
3) If connection of sensor and value is correct, replace outdoor unit PCB
#16 HR unit Sub-cooling inlet pipe temperature sensor error 200 ‘ C16 (Repeat)
C: HR unit
#: HR unit Nuber
HR Unit
Error display
HR #1 HR #2 HR #3 HR #4 HR #5 HR #6 HR #7 HR #8 HR #9 HR #10 HR #11 HR #12 HR #13 HR #14 HR #15 HR#16
C01 C02 C03 C04 C05 C06 C07 C08 C09 C10 C11 C12 C13 C14 C15 C16
Error No. Error Type Error Point Main Reasons
201C#HR
HR unit liquid pipe
temperature sensor
error
Abnormal value of
sensor measurement
(Open / Short)
1. Defective temperature sensor connection
2. Defective temperature sensor
(Open/Short)
3. Defective outdoor unit PCB
Error No. Error Type Error Point Main Reasons
202C#HR
HR unit Sub-
cooling inlet pipe
temperature sensor
error
Abnormal value of
sensor measurement
(Open / Short)
1. Defective temperature sensor connection
2. Defective temperature sensor
(Open/Short)
3. Defective outdoor unit PCB
Error No. Error Type Error Point Main Reasons
203C#HR
HR unit Sub-
cooling discharge
pipe temperature
sensor error
Abnormal value of
sensor measurement
(Open / Short)
1. Defective temperature sensor connection
2. Defective temperature sensor
(Open/Short)
3. Defective outdoor unit PCB
- 158 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. HR unit’s power cable or communication cable connec-
tion defect
2. After auto-addressing, wrong address setting of the
indoor unit (Defective indoor power / transmission error
and PCB defect)
3. Wrong setting of the HR unit’s rotary switch or dip switch
4. HR unit PCB defect
Error
No.
Error type Error point Main reasons
After the auto operation,
if the number of the
indoor units detected is
different from the number
communicating indoor
unit
Pipe detection error
2001
Master
21
‘
001
HR: Heat Recovery
1) Check the periodic blinking of the HR unit’s green LED (transmission LED )
2) When green LED (communication LED) of HR unit blinks regularly,
2.1) Check input power of HR unit.(220V±10%)
2.2) After reset of power of outdoor, wait for more than 30 minutes, temperature of pipes will be cool down then,
do auto-addressing
2.2) While power of HR unit is on, check total indoors display ‘CH05’ or not.(Refer to CH05)
3) When green LED (communication LED) of HR unit blinks regularly, Check setting of rotary switch and dip
switch, After reset of power of outdoor and HR unit, wait for more than 30 minutes, temperature of pipes will be
cool dow then, do auto-addressing *
4) If indoor unit quantity is different between installed quantity and quantity which check thru piping searching,
check pipe installation condition
Outdoor unit ↔ HR unit ↔ Indoor unit
5) If indoor unit has not been connected to #1 valve of HR unit, set pipes of HR unit manually**
6) If it is not applied as above, set pipes of HR unit as manual
[NB] How to check display method of outdoor main PCB 7-segment ?:
'88' ‘ Indoor qty which check thru 'Auto-Addressing' ‘ '88' ‘ Indoor qty which check thru ‘piping checking'
n Error diagnosis and countermeasure flow chart
1. Wrong connection of communication line or pipe
2. Incorrect operation of HR unit PCB Dip Switch
3. Indoor unit connection each HR unit connection port
exceeding the capacity
Error
No.
Error type Error point Main reasons
Indoor unit capacity
exceed HR unit capacity
specification
Excessive connec-
tion of indoor unit to
HR unit
51C#HR
HR: Heat Recovery
1) Check if the communication line and pipe between HR unit and indoor unit are correctly connected
2) Check whether DIP switch is set for each connection conditions between HR unit and indoor unit
3) If the indoor unit connected to HR unit is in group control, check if the corresponding capacity is 100 kBtu or
less.
4) If the indoor unit connected to HR unit is not in group control, check if the corresponding capacity is 56 kBtu or
less (including zoning control)
5) Even after performing the above process, if the same error code occurs, replace the corresponding HR unit
PCB
6) After checking and taking action for No.1~5 processes, carry out auto addressing, and carry out pipe search
n Error diagnosis and countermeasure flow chart
- 158 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. HR unit’s power cable or communication cable connec-
tion defect
2. After auto-addressing, wrong address setting of the
indoor unit (Defective indoor power / transmission error
and PCB defect)
3. Wrong setting of the HR unit’s rotary switch or dip switch
4. HR unit PCB defect
Error
No.
Error type Error point Main reasons
After the auto operation,
if the number of the
indoor units detected is
different from the number
communicating indoor
unit
Pipe detection error
2001
Master
21
‘
001
HR: Heat Recovery
1) Check the periodic blinking of the HR unit’s green LED (transmission LED )
2) When green LED (communication LED) of HR unit blinks regularly,
2.1) Check input power of HR unit.(220V±10%)
2.2) After reset of power of outdoor, wait for more than 30 minutes, temperature of pipes will be cool down then,
do auto-addressing
2.2) While power of HR unit is on, check total indoors display ‘CH05’ or not.(Refer to CH05)
3) When green LED (communication LED) of HR unit blinks regularly, Check setting of rotary switch and dip
switch, After reset of power of outdoor and HR unit, wait for more than 30 minutes, temperature of pipes will be
cool dow then, do auto-addressing *
4) If indoor unit quantity is different between installed quantity and quantity which check thru piping searching,
check pipe installation condition
Outdoor unit ↔ HR unit ↔ Indoor unit
5) If indoor unit has not been connected to #1 valve of HR unit, set pipes of HR unit manually**
6) If it is not applied as above, set pipes of HR unit as manual
[NB] How to check display method of outdoor main PCB 7-segment ?:
'88' ‘ Indoor qty which check thru 'Auto-Addressing' ‘ '88' ‘ Indoor qty which check thru ‘piping checking'
n Error diagnosis and countermeasure flow chart
1. Wrong connection of communication line or pipe
2. Incorrect operation of HR unit PCB Dip Switch
3. Indoor unit connection each HR unit connection port
exceeding the capacity
Error
No.
Error type Error point Main reasons
Indoor unit capacity
exceed HR unit capacity
specification
Excessive connec-
tion of indoor unit to
HR unit
51C#HR
HR: Heat Recovery
1) Check if the communication line and pipe between HR unit and indoor unit are correctly connected
2) Check whether DIP switch is set for each connection conditions between HR unit and indoor unit
3) If the indoor unit connected to HR unit is in group control, check if the corresponding capacity is 100 kBtu or
less.
4) If the indoor unit connected to HR unit is not in group control, check if the corresponding capacity is 56 kBtu or
less (including zoning control)
5) Even after performing the above process, if the same error code occurs, replace the corresponding HR unit
PCB
6) After checking and taking action for No.1~5 processes, carry out auto addressing, and carry out pipe search
n Error diagnosis and countermeasure flow chart
Error No. Error Type Error Point Main Reasons
51C#HR
Excessive connec
-
tion of indoor unit
to HR unit
Indoor unit capacity
exceed HR unit ca-
pacity specification
1. Wrong connection of communication line
or pipe
2. Incorrect operation of HR unit PCB Dip
Switch
3. Indoor unit connection each HR unit con
-
nection port exceeding the capacity
Error No. Error Type Error Point Main Reasons
2001 Pipe detection error
After the auto oper
-
ation, if the number
of the indoor units
detected is different
from the number
communicating
indoor unit
1. HR unit's power cable or communication
cable connection defect
2. After auto-addressing, wrong address
setting of the indoor unit (Defective indoor
power / transmission error and PCB defect)
3. Wrong setting of the HR unit's rotary switch
or dip switch
4. HR unit PCB defect
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