Huawei NetCol8000-A Maintenance And Troubleshooting Manual page 45

Replacing Electrical Heaters
（ 1 ） Temperature
switch
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（ 2 ） Electrical
heater
Step 1 Disconnect the power supply;
Step 2 Disconnect the cables from the
electrical heater;
Step 3 Loosen the four bolts from the rack,
slowly push the electric heater towards one
side of the NetCol8000-A, and take out an
electrical heater;
Step 4 Install a new electrical heater in an
inverse order;
Step 5 Power on the unit and tap Maint >
Diagnostic Mode > Enter to open the
electric heater. Make sure they work
properly. Exit the Diagnostic Mode.
Step 6 Tap Maint > Performance
Maint to clear the electric heater total
runtime.
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