9The GARLAND digital control has a self-diagnostic program. If a problem occurs within the digital controller, you may
see one of the "F" codes.
Below is a listing of the "F" codes with explanations:
-F1- Relay output is enabled when not cook ing. If this failure code appears in the display, the cook relay may be on
even if the control is not cooking. The control should be replaced.
-F2- O ver temperature alarm. If this failure code appears in the display the control is sensing an oven temperature
50° or more above the maximum set temperature (500°). This failure may be caused by a faulty sensor.
Check the sensor connection for loose wires.
Replace the sensor and check for proper operation.
If failure continues replace the control.
-F3- O pen sensor circuit. If this failure appears in the display, the c ontrol is sensing an open circuit at the s ensor
input. This failure is most often caused by a poor connection or broken sensor.
Check sensor connection and leads for broken wires of loose connections. Replace sensor and check for
proper operation. If failure continues replace control.
-F4- Shorted sensor circuit. If this f ailure appears in the display, the control is sensing a short circuit at the s ensor
input. This failure is most often caused by loose wires at the connection of shorted sensor leads.
Check sensor connection and leads for loose wires. Replace sensor and check for proper operation. If failure
continues replace control.
-F5- Relay outputs not enabled when cook ing. If this failure appears in the display the control cannot turn the
relays on even when cooking. The control should be replaced.
-F6- No 60 Hz input. The control does not sense the input power. This failure m ode is most often the result of a
failed component in the c ontrol. However, this failure may also be the result of a very noisy power line. Look
for any large electrical noise producing machinery (such as mixers, compressors, dishwashers etc.). If
possible, turn these machines off. Reapply power to the oven. If the failure repeats, replace the control. If
the failure does not repeat, an electronic control may not work in this application because of noise. You mus t
isolate the supply circuit.
-F7- T he control has detected that calculated EEPROM check sum is not the same as the expected check sum
retrieved from the EEPROM. When the control detects this error code, it will disable outputs before the alarm
sounds.
RESISTANCE vs. TEMPERATURE CHART FOR INTERNAL OVEN TEMPERATURE SENSOR
The chart below will provide the Ohms at various temperatures. This will enable you to determine if the temperature
probe is operable.
The chart is in Degrees Fahrenheit. How to use chart, for 350°, read down to 300 then across to 50, answer is
1654Ohms of resistance.
ROBERTSHAW COM6000 CONTROLLER