Thermador C271 Service Manual - Convection Roast Mode

Convection Roast Mode

Sequence Of Events;

1)

K4, K8, K10, K11 relays close.

2)

K4  relay energizes both cooling motors; airflow from cooling motor

closes the “air switch” contacts. The completed “air switch” circuit signals

the board {signal voltage). Note if the air switch circuit is not completed

within 40 seconds, the board will interpret a cooling fan fault and display

an F34 ERROR CODE FOR THE UPPER OVEN, AND AN F64 error code

for the lower oven.

3)

K11 relay closes and activates the convection motor. Note: the convection

motor will stop when the oven door is opened during any convection

mode.

4)

Pin header P14 on the relay board sends 24VDC to the double line break

relay (DLB) coil when the coil is energized; the DLB contacts close.

Current flows from L1 to one leg of the bake, broil, and convection

elements.

5)

Bake relay K8 and convection relay K10 alternately open and close and

send current from L2 to the other leg of the bake and convection elements.

The bake element is on for 30 seconds, and the convection element is on

for 30 seconds during each 1-minute cycle.

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