Issued June 2020
Maintenance
Copyright 2020, Heil Environmental
Printed in U.S.A.
143
PROXIMITY SWITCH TROUBLESHOOTING
When one or more of a unit’s functions do not operate properly and there are proximity switches in the circuits of the unit
for these functions, refer to the following table as a guide to find the problem(s).
Heil proximity switches have a Light Emitting Diode (LED) on the switch to indicate that the switch is sensing metal. The
light changes color when the switch senses metal. Green indicates the switch is ON. Yellow indicates the switch senses
metal. Some proximity switches only have the yellow light.
PROXIMITY SWITCH TROUBLESHOOTING TABLE
Loose or corroded electrical connections.
Replace the electrical connections.
Damaged Switch
A. Cracked Ferrite core causing the fine internal wire to
break.
B. Cracked Ferrite core – but wire is not broken – the
sensitivity of switch will increase which causes
sensing distance to increase or switch work
intermittently as the temperature changes.
DO NOT strike switch to make it work.
DO NOT damage the switch when you adjust it.
DO NOT adjust switch too close to the metal it is sensing.
Voltage spikes from truck chassis electrical system will
break down the internal electronics of the proximity
switch.
1. Make sure the power source from the chassis manufacturer
is clean.
2. The body electrical system is protected from voltage spikes.
Adjust proximity switches to sense metal as follows:
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