Operator`s manual

14
ERROR CODES:
Err codes can be cleared from the display by turning the front panel power switch off and then on again.
Code Description Possible Cause
Err 1 Over Temperature
Err 2 Open Thermocouple
(TC)
Err 3 Temp > Tmax
Err 7 Brown-out
Err 8 EEPROM error
Err 19 Line frequency
TROUBLESHOOTING THE VULCAN "3-" CONTROL
PROBLEM
Dead, Not Operating
No Power / Display
Not Heating
During Program
Operation
Door Too Loose or
Tight
Heating Too Slow
Program Turns Off
Too Early
(3-550PD only)
Power Door Does Not
Open
CHECK LIST / CAUSES
- Check power receptacle or outlet for power
- Check line or power cord connections
- Turn on green power switch
Does the green power switch light when the Start
key is pressed?
No: - Is door completely closed? Door switch may
be interrupting power.
Yes:- Check the fuses on the controller PCB
- Check heating element plates for continuity
- The amount of force or drag on the door move-
ment can be changed by adjusting the hex screws
located on the upper rear corners of the furnace
cabinet. Turning the screw clockwise adds drag
and requires more force
- Rate programmed wrong. 1.5°/minute rather than
15.0°/minute
- Large loads will slow down response time and
increase the time to temperature by 2 to 5 times
- Programming a Rate to zero will terminate the
remainder of the program
- End of program option has been changed from 1
or 2 to option 3 which turns off the furnace at the
end of the program [End].
- A hidden switch to activate the door is located
between the °C/°F key and the Delay Start key.
Try pressing it to test the operation.
- Check activation switch connections to back of
furnace.
- Allow the furnace to cool and test the door by
activating the switch and then lifting up/pushing
door on the door in the appropriate direction of
travel.
TROUBLESHOOTING
Temp > 1120°C, shorted thermocouple, shorted triac, shorted optotriac, wiring
connections, computer PCB
Open TC tip, connection to TC, TC to PCB connection, computer PCB
Muffle temperature has exceeded the programmed limit temperature TMAX
(see SETUP?).
Low line voltage < 90VAC (<190VAC for 200-240V), wall socket shared with
other loads, furnace connected with small extension cord
Parameter program memory error; computer PCB
No line frequency detected, computer PCB