Huawei NetCol8000-A Maintenance And Troubleshooting Manual page 26

Troubleshooting (5)
Symptom
The heating function is
unavailable.
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Possible Cause
The electric heater temperature
switch is being protected.
The airfow loss switch is
faulty, or the electrical heater
circuit breaker is of.
An electric heater is burnt out.
Solution
View the alarm, check the
manual reset temperature switch
for the electric heater, and
manually switch it on if it
was switched of. Check the
temperature switch and replace
it if it is faulty.
Check the electric heater circuit
breaker status.
Check whether the airfow loss
switch is properly connected.
Disconnect the power supply and
check whether the electric
heater is damaged by checking
the electric heater resistance
properties with an ohmmeter.
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