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| Troubleshooting
Chapter 11
|
11-90
305435H03
Table 7 Troubleshooting Furnace problems
Problem
Solution
Furnace Temp
If the unit heats past set-point but heating stops at Hi temp
Exceeds Setpoint.
alarm and element power on light extinguishes check the
solid-state relay.
First disconnect power from the furnace and remove the
controller leads to solid state relay. Re-connect power to
furnace. If the unit heats, replace the solid-state relay.
Front panel red indicator light is on:
If the controller OP1 is off, check that the setpoint
temperature is higher than the furnace display temperature.
If the OP1 is on, disconnect power from the furnace and check
the heating elements for continuity.
Front panel red indicator light is off:
Furnace does not
Check that the power switch is on.
heat.
Check that the indicator lights on the controller display
are on.
Check the electrical wires for visible damage.
Replace the electrical wires if necessary. This should be done
by trained technician.
Check that the Alarm Setpoint on the controller is set higher
than the operating temperature.
1500°C Tube Furnace
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