Frymaster FOOTPRINT 8196345 Service & Parts Manual page 40

Problem
CM7 display shows
PROBE
FAILURE.
CM7 display shows
PROBE
FAILURE with
alarm sounding.
CM7 display shows
IGNITION
FAILURE.
Computer will not
go into program
mode or some
buttons do not
actuate.
CM7 display shows
low temp,
A. Failed computer.
heating indicator
cycles on and off
B. Damaged computer wiring
normally but fryer
does not heat.
CM7 display shows
igNITION
FAILURE with
alarm sounding.
Heating indicator is
on, but fryer is not
heating.
CM7 display shows
IGNITION
FAILURE and
alarm sounds, but
fryer operates
normally (false
alarm).
CM7 display shows
HI 2 BAD.
Probable Causes
Problem with the temperature
measuring circuitry including the
probe.
Damaged computer wiring harness or
connector.
Open drain valve, failed computer,
failed interface board, open high-
limit thermostat.
Failed computer.
harness.
Drain valve not fully closed.
Failed computer.
Computer in high-limit test mode.
1-34
Corrective Action
This indicates a problem within
the temperature
circuitry. Check resistance of
probe, if faulty replace probe.
Swap the computer wiring harness
with one known to be good. If
problem is corrected replace the
harness.
Is displayed if the fryer loses its
ability to heat oil.
displayed when
temperature is above
(232°C) and the
thermostat has opened, halting the
heating of the oil.
Replace computer
A. Replace computer.
B. Replace computer wiring
harness.
Press the reset switch on the MIB
board. All drain valves should
close. Using the ON/OFF switch,
turn the computer OFF and then
ON again.
Replace computer.
This is displayed only during a
test of the high-limit circuit and
indicates that the high-limit has
failed.
measuring
It is also
the oil
450°F
high-limit