ITW Dynatec DYNAMELT D15 Series Technical Documentation Manual page 162

Page 7-28 Troubleshooting
Revised 10/14
Problem
Aux (No.) Heater
Open
Possible Cause
1. Disconnection between
Aux and ASU.
2. Disconnection between
Aux harness and AUX
Power PCB.
3. Open Aux heater element.
4. Aux fuse on AUX Power
PCB inoperative.
D SERIES V6 DCL ASU Manuals
Solution
1. Visually examine affected Aux plug
and ASU socket for cleanliness and prop-
er contact and seating. Refer to wiring
diagram for pin identification. The prob-
lem can be isolated by plugging the af-
fected Aux into another ASU socket. If
the new Aux number is then displayed as
malfunctioning, the problem is in the Aux
that was moved. Repair or replace Aux or
ASU Aux harness as appropriate.
2. Verify that the Aux harness is properly-
inserted into its AUX Power PCB plug.
Check for loose leads, debris and proper-
contact.
3. Use an ohmmeter to measure resistance
of Aux cartridge heater. Refer to resist-
ance table for resistance values. Infinitely
high resistance indicates an open heater.
Replace cartridge heater as appropriate.
4. If fuse is found to be blown, do not re-
place it without first finding cause. Look
for a short circuit to ground in the Aux
heater circuit, particularly at the Aux
device.
Fuse failure is usually due to a problem in
the Aux heater circuit, not the solid state
relays.
ITW Dynatec