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Quick Reference Guide - Page 31
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.
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 1 DISPLAY MODE 2
No. Cause D800 D801 D802 D803 D804 D800 D801 D802 D803 D804
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
○ ○ ● ● ○ ◎ ● ◎ ◎ ●
8
Outdoor temperature sensor (TE/TS)
connection 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
○ ○ ○ ● ○ ◎ ◎ ● ● ●
17
A
bnormal power (open phase detected
or 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
○ ○ ○ ● ○ ◎ ● ◎ ◎ ◎
○
: ON
●
: OFF
◎
: FLASHING