Turbo Chef Technologies 3240 manual Troubleshooting F7 RTD FAULT RTD Failure

3 8 T RO U B L E S H O OT I N G

Troubleshooting:

F7: RTD FAULT (RTD Failure)

Replace the RTD (page A-8).

YES

Open the right end bell.

Is the RTD damaged or defective (page 23)?

NO

Is the RTD connected properly to the I/O control board

(page 45)?

NO

Replace RTD
	YES
(page A-8).

Is the RTD open? Using an ohmmeter, measure at the control board (pages 45- 47). RTD should measure approxi- mately 4-5 W. (See page 24 for ohm/temperature chart.)

			Correct wiring
	YES
			(page 45).
		Replace the I/O
		control board
NO
		(page A-8).

Troubleshooting:

F8: HIGH LIMIT TRIPPED (High Limit Trip)

YES

		Are all the contacts
Is the high limit thermostat
		closed on the high
	NO
tripped (page 21)?
		limit thermostat?

Reset and determine why it tripped - over temp, blower failure, etc.

Check if the high limit probe or RTD is damaged or defec- tive, replace if needed (page A-8).

Ensure that the minimum gas pressure is correctly set, reset if needed (page 3).

YES

Replace the I/O control board (page A-8).

Is the wiring correct (page 45)?

NO

Correct wiring (page 45).

YES NO

Replace the high limit thermostat (page A-14).