Vaillant V 12-025 HWI Training Manual page 45

2) If the room temperature sensor goes wrong, the
system still has the anti-frosting protection and anti-
freezing protection function.
6. In heating mode, if the temperature sensor of the
indoor coil goes wrong, after delaying for 3 minutes the
fault code will be indicated and the unit will be turned
off; The system will be operated with failure if the room
temperature sensor of the goes wrong, the
corresponding fault code has not been indicated and the
default room temperature is 25 ºC in automatic wind
operation. The working condition of the compressor at
the moment is: it runs for 20 minutes firstly and then
stops for 5minutes and goes round and round like this.
The system still has the overloading protection and
overheating protection functions.
7. In dehumidifying mode and ventilating mode, when
both of the room temperature sensor and indoor coil
temperature sensor work wrong and the corresponding
fault code is out of display, the system still runs in the
normal way.
• If the room temperature sensor goes wrong, during
dehumidifying operation, the temperature should be
kept no lower than 23
• If the temperature sensor of the indoor coil goes
wrong, the operating mode is depended on the
room temperature in the dehumidifying mode.
8. If the outdoor temperature goes wrong, the system
works well as usual and doesn't display the fault code
no matter in which mode it is. In heating mode, however,
the dehumidifying operation will be switched to the
intelligent dehumidifying mode.
PG motor protection
When PG motor is running, if the feedback signal of PG
motor has not been inspected for 60 seconds, it will
begin to run with failure and won't display any fault
code; if the rotating velocity of PG motor keeps lower
than 200rpm for 30 seconds, that means PG motor
works wrong and the unit will be shut down and the
system will display the corresponding fault code.
During the failure operation, PG motor continues the
operation mode if the feedback signal of PG motor is
right. Until the system is restarted up, can PG motor run
as well as usual.
Display screen closed function
1. When the air conditioner is turned on, the system will
enter display screen closed mode by pressing "LAMP"
key on the remote controller and all displays on the
indoor display lamp board will be turned off; Press the
key again, the system will exit from the mode and
Split Type Installation Manual
display the original items of the lamp board;
2. During the display screen closed operation, when the
air conditioner receives the signal from the remote
controller, the display lamp board indicates what are
depended on the setting requirements and all display
items will be closed 10 seconds later;
3. The default state for the system is with no display
screen closed function and the function will be cancelled
if the mode is changed.
PCB Explanation 9
EN 45