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15. Troubleshooting
Guide
15.1 Self Diagnosis Function (CU-2E12SBE, CU-2E15SBE and CU-2E18SBE)
Diagnosis
display
Abnormality or
protection control
Abnormality judgment Protection operation
Problem
Check location
H11
Indoor/outdoor abnormal
communication
After operation for
1 minutes
Indoor fan only
operation can start by
entering into force
cooling operation
Indoor/outdoor
communication not
establish
Indoor/outdoor
wire
terminal
Indoor/outdoor
PCB
Indoor/outdoor
connection
wire
H12
Indoor unit capacity
unmatched
90s after power supply
-
Total indoor capability
more than maximum
limit or less than
minimum limit, or
number of indoor unit
less than two
Indoor/outdoor
connection
wire
Indoor/outdoor
PCB
Specification
and
combination table in
catalogue
H15
Compressor temperature
sensor abnormality
Continuous for 5s
-
Compressor
temperature sensor
open or short circuit
Compressor temperature
sensor lead wire and
connector
H16
Outdoor current
transformer (CT)
abnormality
- -
Current transformer
faulty or compressor
faulty
Outdoor PCB faulty or
compressor faulty
H27
Outdoor air temperature
sensor abnormality
Continuous for 5s
-
Outdoor air
temperature sensor
open or short circuit
Outdoor air temperature
sensor lead wire and
connector
H28
Outdoor heat exchanger
temperature sensor 1
abnormality
Continuous for 5s
-
Outdoor heat
exchanger
temperature sensor 1
open or short circuit
Outdoor heat exchanger
temperature sensor 1 lead
wire and connector
H32
Outdoor heat exchanger
temperature sensor 2
abnormality
Continuous for 5s
-
Outdoor heat
exchanger
temperature sensor 2
open or short circuit
Outdoor heat exchanger
temperature sensor 2 lead
wire and connector
H33
Indoor/outdoor
misconnection
abnormality
- -
Indoor and outdoor
rated voltage different
Indoor and outdoor units
check
H36
Outdoor gas pipe
temperature sensor
abnormality
Continuous for 5s
Heating protection
operation only
Outdoor gas pipe
temperature sensor
open or short circuit
Outdoor gas pipe
temperature sensor lead
wire and connector
H37
Outdoor liquid pipe
temperature sensor
abnormality
Continuous for 5s
Cooling protection
operation only
Outdoor liquid pipe
temperature sensor
open or short circuit
Outdoor liquid pipe
temperature sensor lead
wire and connector
H64
Outdoor high pressure
sensor abnormality
Continuous for 1 minute
-
High pressure sensor
open circuit during
compressor stop
High pressure sensor
Lead wire and connector
H67 Nanoe
abnormality
Nanoe stop for 5 minutes
for 3 times
- Nanoe
faulty
PCB
Nanoe
system
High
voltage
H70
Light sensor abnormality
Continuous for 24 hours,
15 days
-
Light sensor open or
short circuit
Light sensor (defective or
disconnect)
H97
Outdoor fan motor
mechanism lock
2 times happen within
20 minutes
-
Outdoor fan motor
lock or feedback
abnormal
Outdoor fan motor lead
wire and connector
Fan motor lock or block
H98
Indoor high pressure
protection
- -
Indoor high pressure
protection (Heating)
Check indoor heat
exchanger
Air filter dirty
Air circulation short circuit
H99
Indoor operating unit
freeze protection
- -
Indoor freeze
protection (Cooling)
Check indoor heat
exchanger
Air filter dirty
Air circulation short circuit
F11
4-way valve switching
abnormality
4 times happen within
30 minutes
-
4-way valve switching
abnormal
4-way
valve
Lead wire and connector
Содержание CU-2E18SBE
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