SOURCE: My TurboChef Turbochef Tornado starts
replace 3 door switches, very cheap fix. bout $2.50 per switch and all you need is a screwdriver.
F7: Thermocouple Open
CC Thermocouple
Reads 999?F/C or
IR Thermocouple
Reads 1999?F/C
1. Check the connection of open thermocouple on the I/O control board.
If the connection is OK, verify thermocouple is not an open circuit
by using your ohm meter. The cook cavity thermocouple should
measure approximately 4-5 ohms and the IR thermocouple should
measure approximately 30-40 ohms. Measure at the I/O control board
40-pin connector.
o Thermocouple indicates open circuit: Replace defective thermocouple.
o Thermocouple OK: Replace the I/O control board.
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