Toshiba HWS-803H-E Quick Reference page 40

Outdoor Fault Diagnosis
You can perform fault diagnosis of the outdoor unit with the LED's on the P.C. board of the outdoor unit in addition
to check codes displayed on the wired remote controller of the hydro unit.
Use the LED's and check codes for various checks.
Check of the current abnormal status
1. Check that DIP switch SW803 is set to all OFF.
2. Jot down the states of LED800 to LED804. (Display mode 1)
3. Press SW800 for at least one second. The LED status changes to
display mode 2.
4. Check the code whose display mode 1 equals the jotted LED status and
display mode 2 equals the current flashing status of LED800 to LED804
from the following table to identify the cause.
No. Cause
1 Normal
2 Discharge sensor (TD) error
3 Heat exchanger sensor (TE) error
4 Heat exchanger sensor (TL) error
5 Outside air temperature sensor (TO) error
6 Suction sensor (TS) error
7 Heat sink sensor (TH) error
Outdoor temperature sensor (TE/TS) connection
8
error
9 Outdoor EEPROM error
10 Compressor lock
11 Compressor lock
12 Current detect circuit error
13 Thermostat for compressor activated
14 Model data not set (on the service P.C. board)
15 MCU-MCU communication error
16 Discharge temperature error
Abnormal power (open phase detected or
17
abnormal voltage)
18 Heat sink overheat
19 refrigerant leak detected
20 4-way valve reverse error
21 High pressure release operation
22 Outdoor fan motor error
23 Compressor driver short circuit protection
24 Position detect circuit error in one-line display
DISPLAY MODE 1
D800 D801 D802 D803
● ● ●
○ ○ ●
○ ○ ●
○ ○ ●
○ ○ ●
○ ○ ●
○ ○ ●
○ ○ ●
○ ○ ●
● ● ○
● ● ○
● ● ○
● ● ○
● ○ ○
● ○ ○
○ ○ ○
○ ○ ○
○ ○ ○
○ ○ ○
○ ○ ○
○ ○ ○
○ ○ ○
○ ○ ○
○ ○ ○
○
: ON
39
Check of the abnormal status in the
past although the abnormal status is
not occurred now.
1. Set bit 1 of DIP switch SW803 to ON.
2. Jot down the states of LED800 to
LED804. (Display mode 1)
3. Press SW800 for at least one second.
The LED status changes to display
mode 2.
4. Find an error whose display mode 1
equals the jotted LED status and display
mode 2 equals the current flashing
status of LED800 to LED804 from the
following table to identify the error.
• An outside air temperature (TO)
sensor error can be checked only while
an error occurs.
DISPLAY MODE 2
D804 D800 D801
● ● ● ●
● ○ ● ●
● ○ ● ◎
● ○ ◎ ◎
● ○ ● ●
● ○ ● ●
● ○ ◎ ●
● ○ ◎ ◎
● ○ ◎ ◎
● ○ ◎ ●
● ○ ● ◎
● ○ ◎ ◎
● ○ ● ●
● ○ ● ◎
● ○ ◎ ●
● ○ ◎ ◎
● ○ ◎ ●
● ○ ◎ ◎
● ○ ◎ ◎
● ○ ◎ ◎
● ○ ● ●
● ○ ● ◎
● ○ ● ◎
● ○ ◎ ●
● ◎
: OFF
D802 D803 D804
● ● ●
◎ ● ●
◎ ● ●
◎ ● ●
● ◎ ●
◎ ◎ ●
◎ ◎ ●
◎ ◎ ●
◎ ◎ ◎
● ● ●
● ● ●
● ● ●
◎ ● ●
● ◎ ●
◎ ◎ ◎
● ● ●
◎ ● ●
◎ ● ●
◎ ◎ ●
● ● ◎
◎ ● ◎
◎ ● ◎
● ◎ ◎
◎ ◎ ◎
: FLASHING