Troubleshooting; Appendix - Toshiba RAV-GM802ATW-E Installation Manual

14

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
: ON, : OFF, : Rapid flashing (5 times/sec)
No. Trouble description
D800 D801 D802 D803 D804 D805
1 Normal
Discharge temp. sensor (TD)
2
trouble
Heat exchanger temp. sensor (TE)
3
trouble
Heat exchanger temp. sensor (TL)
4
trouble
Outside air temp. sensor (TO)
5
trouble
6 Suction temp. sensor (TS) trouble
7 Heat sink temp. sensor (TH) trouble
8 Miss-mounting of sensor (TE, TS)
9 EEPROM trouble
10 Compressor break down
11 Compressor lock
12 Current detection circuit trouble
13 Case thermostat operation
14 Unset model type of P.C.board
15 MCU communication trouble
16 Discharge temp. trouble
17 High pressure SW operation
18 Power supply trouble
19 Heat sink overheat trouble
20 Gas leak detection
21 4-way valve inverse trouble
22 High pressure protective operation
23 Fan system trouble
Short-circuit of compressor drive
24
element
25 Position detection circuit trouble
57-EN
LED display <GM802ATW,GM902ATW>
<GM1102ATW,GM1402ATW>
LED
(D800 to D805)
<GM1602ATW>
<GM1102AT8W, GM1402AT8W,
GM1602AT8W>
LED
(D800 to D805)
– 29 –
15

Appendix

[1] Existing piping
Work instructions
The existing R22 and R407C 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
LED
(D800 to D805) the pipe strength are conventionally referred to the
local site.
SW01
If the specified conditions can be cleared, it is
SW02
possible to update existing R22 and R407C 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
SW01
In the following cases, the existing pipes should
SW02
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 (mm)", 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
SW01
case.
SW02
* Pipe diameter and thickness (mm)
Reference
Wall thickness
outside diameter Material
(mm)
(mm)
6.4 0.8 –
9.5 0.8 –
12.7 0.8 –
15.9 1.0 –
• In case the pipe diameter is Dia.12.7 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 if gas was leaked from the pipes and
the pipes were not repaired and refilled.
• There is the possibility of rain water or air,
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.
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.
58-EN