Troubleshooting - Toshiba HWS-802H-E Installations-Handbuch

Air to Water Heat Pump
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 check codes displayed on the wired remote controller of the hydro unit.
Use the LEDs and check codes for various checks. Details of check codes displayed on the wired remote controller
of the hydro unit are described in the Installation Manual of the hydro unit.
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.
1 Normal
2 Discharge (TD) sensor error
3 Heat exchanger (TE) sensor error
4 Heat exchanger (TL) sensor error
5 Outside air temperature (TO) sensor error
6 Suction (TS) sensor error
7 Heat sink (TH) sensor 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
Model data not set
14
(on the service P.C. board)
15 MCU-MCU communication error
16 Discharge temperature error
Abnormal power
17
(open phase detected or abnormal voltage)
18 Heat sink overheat
19 Gas 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
Cause
Outdoor Unit Installation Manual
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
D800 D801 D802 D803
● ● ● ●
● ●
● ●
● ●
● ●
● ●
● ●
● ●
● ●
● ● ●
● ● ●
● ● ●
● ● ●
● ●
● ●
●
●
●
●
●
●
●
●
●
– 21 –
Display mode 2
D804 D800 D801 D802 D803
● ● ● ● ●
● ● ●
● ●
●
● ● ●
● ●
●
● ● ●
● ● ●
● ●
● ● ●
● ●
●
● ●
● ●
●
● ●
● ● ●
● ●
● ●
●
(●:OFF :ON :Flashing)
D804
●
●
●
●
●
●
●
●
●
●
●
●
●
●
EN
●
●
●
20-EN