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13
Troubleshooting
You can perform fault diagnosis of the outdoor unit with the LEDs on the P.C. Board of the outdoor unit in addition
to using the check codes displayed on the wired remote controller of the indoor unit.
Use the LEDs and check codes for various checks. Details of the check codes displayed on the wired remote
controller of the indoor unit are described in the Installation Manual of the indoor unit.
LED displays and check codes
No.
Error
1
Normal
2
Discharge temperature sensor (TD) error
3
Heat exchanger temperature sensor (TE) error
4
Heat exchanger temperature sensor (TL) error
5
Outside air temperature sensor (TO) error
6
Suction temperature sensor (TS) error
7
Heat sink temperature sensor (TH) error
8
Heat exchanger sensor (TE, TS) connection error
9
EEPROM error
10
Compressor breakdown
11
Compressor lock
12
Current detection circuit error
13
Case thermostat operation
14
Model data not set
15
Discharge temperature error
16
Power supply error
17
High pressure SW error
18
Heat sink overheating error
19
Gas leak detected
20
4-way valve reverse error
21
High pressure release operation
22
Fan system error
23
Drive device short-circuiting
24
Position detection circuit error
25
Compressor IPDU or other (not specifically identified)
: ON,
: OFF,
: Rapid flashing (5 times/sec.)
Display
D800
D801
D802
D803
D804
* The LEDs and switches are located at the top right
of the P.C. Board of the outdoor unit as shown in the
figure on the table below.
LED displays
D800
D801
D802
D803
D804
(Yellow) (Yellow) (Yellow) (Yellow) (Yellow) (Green)
14
Appendix
Work instructions
The existing R22 and R410A piping can be reused for
our digital inverter R32 product installations.
WARNING
Confirming the existence of scratches or dents on
the existing pipes and confirming the reliability of
the pipe strength are conventionally referred to the
D805
local site.
If the specified conditions can be cleared, it is
possible to update existing R22 and R410A pipes
to those for R32 models.
Basic conditions needed to reuse existing
pipes
Check and observe the presence of three conditions in
the refrigerant piping works.
1. Dry (There is no moisture inside of the pipes.)
2. Clean (There is no dust inside of the pipes.)
3. Tight (There are no refrigerant leaks.)
Restrictions for use of existing pipes
In the following cases, the existing pipes should
not be reused as they are. Clean the existing pipes
or exchange them with new pipes.
1. When a scratch or dent is heavy, be sure to use
new pipes for the refrigerant piping works.
2. When the existing pipe thickness is thinner than the
specified "Pipe diameter and thickness" be sure to
use new pipes for the refrigerant piping works.
The operating pressure of R32 is high. If there is
a scratch or dent on the pipe or a thinner pipe is
used, the pressure strength may be inadequate,
which may cause the pipe to break in the worst
case.
* Pipe diameter and thickness (mm)
Pipe outer diameter
Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.0
R32/
R410A
Thickness
0.8
R22
In case the pipe diameter is Ø12.7 mm or less
and the thickness is less than 0.7 mm, be sure to
use new pipes for the refrigerant piping works.
3. When the outdoor unit was left with the pipes
disconnected, or the gas leaked from the pipes and
the pipes were not repaired and refilled.
There is the possibility of rain water or air,
D805
including moisture, entering the pipe.
4. When refrigerant cannot be recovered using a
refrigerant recovery unit.
There is the possibility that a large quantity of dirty
oil or moisture remains inside the pipes.
– 14 –
5. When a commercially available dryer is attached to
the existing pipes.
There is the possibility that copper green rust has
been generated.
6. When the existing air conditioner is removed after
refrigerant has been recovered.
Check if the oil is judged to be clearly different from
normal oil.
The refrigerator oil is copper rust green in color:
There is the possibility that moisture has mixed
with the oil and rust has been generated inside
the pipe.
There is discolored oil, a large quantity of residue,
or a bad smell.
A large quantity of shiny metal dust or other wear
residue can be seen in the refrigerant oil.
7. When the air conditioner has a history of the
compressor failing and being replaced.
When discolored oil, a large quantity of residue,
shiny metal dust, or other wear residue or mixture
of foreign matter is observed, trouble will occur.
8. When temporary installation and removal of the
air conditioner are repeated such as when leased
etc.
9. If the type of refrigerator oil of the existing
air conditioner is other than the following oil
(Mineral oil), Suniso, Freol-S, MS (Synthetic oil),
alkyl benzene (HAB, Barrel-freeze), ester series,
PVE only of ether series.
The winding-insulation of the compressor may
deteriorate.
NOTE
The above descriptions are results have been
confirmed by our company and represent our views on
our air conditioners, but do not guarantee the use of
the existing pipes of air conditioners that have adopted
R32/R410A in other companies.
Curing of pipes
When removing and opening the indoor or outdoor unit
0.8
0.8
1.0
1.0
for a long time, cure the pipes as follows:
Otherwise rust may be generated when moisture or
foreign matter due to condensation enters the pipes.
The rust cannot be removed by cleaning, and new
pipes are necessary.
Placement
location
Outdoors
Less than 1 month
Indoors
Term
Curing manner
1 month or more
Pinching
Pinching or taping
Every time
EN
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