Overview of Troubleshooting
This section contains information on the following:
• Fault code descriptions
• Fault code troubleshooting
• Non-fault code troubleshooting
For information on accessing Test Mode, see page
18. For information and illustrations on replacing
components, see the appendix.
Fault Code Descriptions
To view the fault log see page 17.
F1: Blower Running Status Bad
This fault is displayed when the motor controller
indicates no running status.
The motor and motor controller are monitored
continuously in all modes with special handling in
the Test Mode (page 18). If a fault is detected, the
control 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 successful, the
fault code will be cleared from the display. 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
This fault is displayed if the cook cavity temperature
is more than 84ºF (47ºC) below the set temperature
after five seconds into a cook cycle.
The fault is cleared from the display at the onset
of cooking if the cook cavity temperature is within
84ºF (47ºC) of the set temperature or when the
heater is tested in Test Mode (page 18).
F3: Magnetron Current Low
This fault is displayed when the current transformer
(CT) on the I/O control board detects less than 7
amps. The fault is monitored when the microwave
is on during a cook cycle or in Test Mode.
The fault is cleared from the display at the onset of
a cook cycle if the CT detects 7 amps, or when the
magnetron is successfully energized in Test Mode.
F4: Door Monitor Defective
This fault is logged when the control detects
that the monitor interlock switch opens before
the primary 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.
NOTE: Door interlock switches are in parallel. See
the oven schematic, page 63. The fault is monitored
during a cook cycle and in Test Mode when the
microwave is on.
F5: Magnetron Over Temperature
This fault is displayed when the magnetron
thermostat reaches 270ºF (132.2ºC).
The thermostat will reset automatically. The fault is
cleared from the display at the onset of a cook cycle
if the thermostat is closed.
F6: Electrical Compartment
Temperature High
This fault is displayed when the EC thermocouple,
located on the Sage Board, exceeds 149ºF (65ºC).
If the thermocouple reads above 158ºF (70ºC),
the oven will stop cooking. The EC temperature is
monitored once per minute.
The fault is cleared from the display if on the next
check, the EC thermocouple temperature is below
149ºF (65ºC).
F7: RTD Open
This fault is displayed when the control detects that
the RTD is “open.” The display will show a reading
of “999ºF/C,” indicating the RTD is open. The
fault is cleared when the control detects continuity.
F8: Heat Low
This fault displays when the oven is warming up or
during Test Mode if the cook cavity temperature
fails to rise at least 14ºF (7ºC) within a given 60
seconds.
TROUBLESHOOTING
45
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