TurboChef Technologies 2020 - Manual (Page 52)

3 2 T R O U B L E S H O OT I N G
Troubleshooting:
F8: HIGH LIMIT TRIPPED
Is the high limit thermostat
tripped (page 21)?
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).
NO YES
Troubleshooting:
F7: RTD FAULT
Open the right end bell.
Is the RTD damaged or
defective (page 22)?
Is the RTD
connected
properly to the
I/O control
board
(pages 37-40)?
Replace the I/O
control board
(page A-8).
NO
Correct wiring
(pages 37-40).
Replace the RTD
(page A-8).
YES NO
NO
YES
Are all the contacts
closed on the high
limit thermostat?
Is the wiring
correct (pages
37-40)? NO YES
Replace the high
limit thermostat
(page A-6).
NO
YES
Correct wiring
(pages 37-40).
Replace the I/O
control board
(page A-8).
Is the RTD open? Using an ohmmeter,
measure at the control board (pages 37-
40). RTD should measure
approximately 100
W at 32°F (0°C) See
page 22 for ohm/temperature chart.
YES