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3.3 Trouble Shooting
3
Heater cooling fan turned ON/OFF on
“Processor I/O Check (0624)”?
Is the harness between the heater
cooling fan and the PDB23 circuit board
is poorly connected or broken?
Replace fan.
Solved?
Connect harness correctly,
repair or replace it.
Replace the PDB23 circuit board.
Abnormal
Yes
Solved
Normal
No
Not solved
END
P1:
F700 to PDB2
P2:
F701 to PDB2
PS1/2/3: F702 to PDB2
PS4:
F703 to PDB2
<Heater cooling fan>
Return at below 42
°
C?
Is the harness between the safety
thermometer and the PAC23 circuit board
is poorly connected or broken?
Replace safety thermostat.
Solved?
Connect harness correctly,
repair or replace it.
Replace the PAC23 circuit board.
No
Yes
Solved
Yes
No
Not solved
END
P1:
D700 to PAC18
P2:
D701 to PAC18
PS1/2/3: D702 to PAC18
PS4:
D703 to PAC18
<Safety thermostat>
Safety thermostat operated on
“Processor Input Check (0624)”?
Operating temperature:64
°
C
Returned temperature:42
°
C
Not operated
Operated
To “Heater cooling fan”
Clean fan filter.
Determine the cause of high temperature.
P1
Operating temperature: 64
°
C
P2
Returned temperature: 42
°
C
PS1/2/3
Operating temperature: 80
°
C
PS4
Returned temperature: 42
°
C