No service call
Vol. 18 #2, July 1991
Check your temperature controllers. Approximately 20% of my technical service calls are easily handled by insuring the controllers are doing their job.
Check for proper cooling and/or heating, blown fuses, blown heater bands, plugged cooling lines, or poorly placed thermocouples.
See also
Seated TCs
Temperature control
Temperature controller calibration
Thermocouple connections 1