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The NGC (Tornado) oven has the ability to continually
monitor and log various fault conditions. Some fault
conditions will terminate cook cycles, while others
will not. Please refer to the fault code table on
page 12 for more detailed information.
When a fault is detected, the Fault Log will incre-
ment. However, if the fault is subsequently cleared
by some action, whether service related or not, the
Fault Log will not decrement.
TO VIEW FAULT CODES
To view the Fault Log, simultaneously press the “4”
and “6” keys while the oven is in the
OFF STATE.
The oven will display all faults logged. Figure 6.
Each fault will log up 255 instances before rolling
back to zero. To zero the log, see pages 14-15
(
TEST MODE).
NOTE: The Fault Log also displays cook counts,
which will log up to 65,535 cook cycles. In order
for the control to log a cook cycle, the oven must
complete the first event of any given recipe. If a
recipe has only one event, the oven must complete
the entire cook cycle in order to count it.
FAULT CODE DEFINITIONS
F1: Blower Running Status Bad
Fault is displayed when the motor controller
indicates no running status.
The motor and motor controller are monitored con-
tinuously in all modes with special handling in
SELF
TEST
and TEST MODE. If a fault is detected, the con-
trol will terminate a cook cycle and display
F1:
BLOWER. Upon turning on the oven, the control will
attempt to restart the motor. If the restart is suc-
cessful, the fault code will be cleared. The fault is
also cleared from the display at the onset of cooking
or when the blower motor is tested in
TEST MODE.
F2: Cook Temperature Low
Fault is displayed if the cook cavity temperature is
more than 84
º
F (47
º
C) below the set temperature
after five (5) seconds into a cook cycle.
The fault is cleared from the display at the onset of
cooking if the cook cavity temperature is within
84
º
F (47
º
C) of the set temperature or when the
heater is tested in the
TEST MODE.
F3: Magnetron Current Low
Fault is displayed when the current transformer
(CT) on the I/O control board does not detect
enough current. The fault is monitored when the
microwave is on during a cook cycle or self-test.
The fault is cleared from the display at the onset of
a cook cycle if the CT detects current or when the
magnetron is successfully energized in
TEST MODE.
F4: Door Monitor Defective
Fault is displayed when the control detects that the
monitor interlock switch unlatches before the pri-
mary or secondary interlock switches.
In addition, this fault will blow the F3 fuse if the
microwave high voltage system is energized when
the fault occurs. The fault is cleared from the display
when the oven is powered off and then back on.
COOK COUNT
F1 BLOWER
F2 LOW TEMP
F3 MAG CURR
F4 MONITOR
F5 MAG TEMP
F6 TEMP
S/N XXXXXX
NGCVXXXX XXXXXX
0
0
0
0
0
0
0
FIGURE
6: Fault Log
FAULT CODES