2L6/2N6/2N5/2N4
1-4-120
6040 Fuser heater error
Input from fuser thermistor 1
is abnormal value continu-
ously for 1 s.
Fuser unit 1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Fuser unit and Engine PWB (YC26)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the Fuser unit and execute
U167 counter clear (see page 1-3-112).
Engine PWB 1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
80).
Fuser IH PWB 1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Fuser IH PWB (YC4) and Engine PWB
(YC26)
2. Replace the fuser IH PWB (see page 1-
5-96).
Code Contents Related parts
Check procedures/
corrective measures
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