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Troubleshooting
Problem
Possible cause
Trace heater remains
No power supply
cold
Trace heater bus wires or power wiring
not properly connected
Control unit adjusted incorrectly
Automatic circuit
Automatic circuit breaker defective
breaker tripped
Automatic circuit breaker has wrong trip-
ping characteristics. e. g. "B" instead of "C"
Nominal circuit breaker size is insufficient
Maximum heating circuit length has been
exceeded
End seal has not been installed
Short circuit
Humidity inside the connection system or
end seal
Ground fault protection
Trace heater damaged
is disengaged
Moisture in the components
Ground fault protection defective
Low or inconsistent in-
Trace heater damaged
sulation resistance
Moisture in the components
Arcing due to damaged trace heater in-
sulation
Arcing due to inadequate stripping dis-
tance between heating element and
grounding braid
Short-circuit between the grounding braid
and the heating element or the grounding
braid and the pipe
Test leads touching the junction box
Note: High pipe temperature may lower the insulation resistance reading relative to earlier readings on a cold pipe.
21-5400-7D0001/-
05/2023-EHT-466854
Notice Technical data subject to change without notice.
No claims for damage arising from alternations, errors or misprints shall be allowed.
Remedy
Check the power wiring for continuity to circuit breaker.
Connect the trace heater and power wiring according to the installa-
tion instructions.
Adjust the control unit according to the installation instructions.
Replace the automatic circuit breaker.
Install an automatic circuit breaker with Type-C tripping characteristics
or contact the factory for Type-B tripping characteristics.
Install an automatic circuit breaker with higher capacity. Observe the
maximum amperage of all components of the trace heating circuit!
Split the heating circuit into separate circuits.
Install the end seal according to the installation instructions.
Identify the cause and remedy the fault (e. g. ensure that trace heater
bus wires are not twisted together).
Dry the components. For junction boxes. be sure that the cable gland
is correctly installed and sealing properly.
Replace the trace heater at the point where it is damaged.
Dry the components. For junction boxes, be sure that the cable gland
is correctly installed and sealing properly.
Replace the ground fault protection device(s).
Replace the trace heater at the point where it is damaged.
Dry the components. For junction boxes, be sure that the cable gland
is correctly installed and sealing properly.
Replace the trace heater at the point where it is damaged.
Check the stripping distance between bus wires/heating element and
grounding braid at all power, splice and end seal connections to en-
sure adequate separation.
Check for cut or damaged cable or inadequate stripping length.
Relocate test leads and retest.
Page 39 / 40
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