Troubleshooting; Display Board - Toyotomi CCT70A-M Service Manual

2.

Troubleshooting

2.1 Display board

2.1.1 Icon explanation on indoor display board (Big cassette).
2.1.2 Icon explanation on indoor display board (Compact cassett).
2.2. Self-diagnosis
Indoor unit's LED indication
(1) For the Big Four-way cassette
During malfunction or protection, the indicators and digital LED displays as follow:
No Operation Timer
X
1
☆
X
2
☆
X X
3
☆ ☆
4
X X
5
Note: "X" means off, "☆" means flashes at 5Hz
(2) For compact cassette indoor unit
No Operation Timer
X
1
★
X X
2
X
3
○
X
4
☆
Electrical Control
Def/Fan Alarm Digital LED Display
X X
X X
X
☆
X X
X
☆
Def/Fan Alarm
X X
X X
X X
X
○
Malfunction or protection
E2 Indoor temperature sensor is abnormal
E3 Evaporator temperature sensor is abnormal
E4 Condenser temperature sensor is abnormal
E7
E8
Information
Normal standby
Normal off
Normal running
Forced cooling
Troubleshooting
EEPROM malfunction
Full-water malfunction
Remark
Nothing wrong with the unit
when LED indicate these
contents.