Komatsu PC200-8M0, Shop Manual

Page: 1189 / 1254

SEN06151-00
PC200, 200LC, 220, 220LC-8M0 80-100
31
100 Air conditioner
Testing with self-diagnosis function
Testing with self-diagnosis function
Testing outline
The air conditioner controller performs various
self-diagnosis such as sunlight sensor, inside air
temperature sensor, outside air temperature sen-
sor, evaporator temperature sensor, temperature
control system, vent (mode) changeover system,
and refrigerant pressure with the pressure switch. If
an error is detected on the temperature control sys-
tem, vent (mode) changeover system, or refrigerant,
the machine monitor momentarily shows "L01" (2)
and then "Air conditioner system state monitor" is
displayed continuously.
a
The machine monitor displays the system state
monitor "!" when an error occurs in the commu-
nication between the machine monitor and the
air conditioner controller.
a
Even if the cause of a detected problem is re-
stored to normal, the self-diagnosis failure condi-
tion will not automatically be reset. To reset the
failure condition, the starter switch must be set to
OFF.
a
On the "Electrical System" screen in the service
mode of the machine monitor, the system per-
forms self-diagnosis for various sensors. If a
problem is detected, failure information is dis-
played.
a
FRESH/RECIRC air changeover servomotor is
not checked with self-diagnosis function.
How to enter air conditioner "Electrical Sys-
tems" screen in service mode of the machine
monitor.
q
Overview of machine monitor operating pro-
cedure
Normal screen
O
While pressing number key (4), press (1), (2),
and (3) in this order.
Service menu (Mode)
O
Press [F3] twice. Press [F6].
03 Abnormality record
O
Press [F3] once. Press [F6].
02 Electrical Systems screen
q
Detailed description of machine monitor op-
erating procedure
1. On the normal operation screen, while pressing
number key (4), press (1), (2), and (3) in this
order.