Failure Code [879Fmc] Air Mix Damper Abnormality - Komatsu PC200-8M0 Shop Manual

100 Air conditioner

Failure code [879FMC] Air Mix Damper Abnormality

Failure code [879FMC] Air Mix Damper Abnormality
Action
Failure code
level
L01 879FMC
q
The air conditioner controller judged from the potentiometer voltage of the servomotor that the air
Detail of failure
mix (temperature regulation) damper servomotor is not operating.
q
Action of con- The air conditioner controller sends information about the air mix damper abnormality to the ma-
troller chine monitor via CAN communication.
Problem on
q The air conditioner does not operate since temperature cannot be regulated.
machine
q
Method of reproducing failure code: Turn starting switch to ON position.
q
Check whether this failure code is displayed in the "Electrical Systems" (electrical systems abnor-
Related infor-
mality record) screen in the service mode of the machine monitor.
mation
q
Troubleshooting cannot be performed since the connector portion of the air mix damper servomo-
tor cannot be checked while the air conditioner unit is installed on the machine.
Cause
1 Defective air conditioner controller
2 Defective air conditioner unit
PC200, 200LC, 220, 220LC-8M0
Abnormality in air mix (temperature regulation) damper servomo-
Failure tor
(Machine monitor system)
Procedure, measuring location, criteria and remarks
If no failures are found by the above checks, the air conditioner controller may
be defective. (Since this is an internal defect, troubleshooting cannot be per-
formed.)
If no failures are found by the above checks, the air conditioner unit may be
defective. (Since this is an internal defect, troubleshooting cannot be per-
formed.)
SEN06151-00
55
80-100