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| Troubleshooting
Chapter 10
|
10-64
330985H01
Table 6 Furnace Troubleshooting
Problem
Furnace temperature
runs away.
Furnace does not heat.
Solution
Check solid-state relay:
Disconnect controller source to solid state relay.
Connect power to furnace. If the heating unit heats, replace
the solid-state relay.
Front panel red indicator light is on:
If the controller run or local light is off, check that the setpoint
temperature is higher than the furnace display temperature.
If the controller run or local light is on, disconnect power from
the furnace and check the heating element for continuity.
Front panel red indicator light is off:
Check that the power switch is on.
Check that the indicator lights on the controller display are
on.
Check that the furnace door is fully closed.
Check that the door interrupt switch is engaged when the
furnace door is fully closed.
Check the electrical wires for visible damage.
Replace the electrical wires if necessary.
Check that the deviation high alarm setpoint on the
controller is set higher than the operating temperature.
1100°C Box Furnace
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