"HELP" cavity in excess of 560Deg. F

"Door" 1 of 2 door switches has opened -which one?

"oPEn" prompt for operator to open door during cool down.

"Prob" The controller cannot read the probe. Check to verify the probe is connected, if connected ohm the probe out - see temperature readings.

"Setb" The controller is in setback. This will happen if the setback key is pressed or if setback is active and there as been a non-usage time key. Setback is not active in a cook. Press setback to cancel setbacks.

Keypad Fault

Does not apply to 200 series.

If the oven will not turn on when the On/Off button is pressed check to verify that the connection to the keypad connector is properly attached to the control board.

If the connector is attached the keypad is defective.

No Sound Fault

Does not apply to 200 and 300 series

If the oven operates normally but the sound is different, adjust the piezo so that it is not touching any other component. If the oven operates properly but there is no sound, the piezo is defective and replace the control board.

Door Switch Fault

Does not apply to 200 series.

If Cool down, the fans continuing to work when the door is opened, or the oven does not heat check the door switches. Upper door switch for HEAT, Lower door switch for COOL.

Fan Fault

Does not apply to 200 series.

If the fan does not operate check the door switches, and the LEDs on the relay board. On the relay board next to the low and high fan relay is an LED that is lit when the fan is engaged (CR3 LED for high and CR4 for low speed). The controller will call for either low or high fan at all times. The pulse fan is the low fan speed that will pulse on for 30 seconds, off for 30 seconds. The heat will always be off when the fan is in the off cycle. If the control is calling for a fan speed and neither fan LED is lit, check the harness and the pins in the harness to verify that neither has been pushed out of it's connector. Check the motor or the fan if the rest of the system seems operating satisfactory.

No Heat

Does not apply to 200 series.

If the oven does not heat check the door switches, the set temperature and the LED on the relay board. On the relay board next to the heat relay is an LED that is lit when the relay is engaged. If the controller is calling for heat and the, heat LED is not lit, check the harness and the pins in the harness to ensure that neither has been pushed out of it's connector. Check the contactor or gas valve if the rest of the system seems operating satisfactory.

Potentiometer Or Encoder Fault

Potentiometer- 200 and 300 series. The potentiometer can turn 3/4 of a complete rotation. If the temperature does not change when the potentiometer is turned, (this will take 5 minutes or more) check to see if the potentiometer is connected to the control board. Pot is a 0 to 10.25K ohm.

If the oven only maintains one temperature and the potentiometer is connected the potentiometer is defective.

Encoder series 410,450,455,470,471 and 475 series. The encoder can turn indefinitely. If the temperature display does not change when the encoder is turned, check to see if the encoder is connected to the control board. If the display does not change when a manual temperature is entered the encoder is defective.

Core Probe Failures

Applies to 455 only.

If the core probe is used, the core probe LED will be lit and the temperature of the product will be displayed if the product is above 32°F. The programmed range for the core probe is 100 to 200 °F.

Temperature Readings

Room Temperature: 77 °F

= 1000 ohms

100°F

=

1103 ohms

 

200°F

=

1350 ohms

 

300°F

=

1554 ohms

 

350°F

=

1654 ohms

 

400°F

=

1753 ohms

 

Page 62

Part # MCOSM06 Rev 1 (11/03/08)

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Image 62
Garland 200 Keypad Fault, No Sound Fault, Door Switch Fault, Fan Fault, No Heat, Potentiometer Or Encoder Fault

200 specifications

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