Error Codes - Monogram ZET1PL1SS Technical Service Manual

Error Codes

The electronic oven control has error (F) codes that can be utilized by the service technician in order to
quickly identify failed or improper operation of certain oven components. The oven may stop operating but
not give an F code on the display immediately. F codes are stored in nonvolatile EEPROM memory until the
same fault occurs twice consecutively. After that, the F code will be displayed. The last 7 F codes can be
recalled by pressing together the TIMER, CLOCK, and ENTER buttons for 3 seconds. For all F codes, except
F2, tone can be muted by pressing any button. All F codes, except for F9, are suppressed. F9 is the only error
code that can be displayed for the consumer.
ERROR
CODE
F2 Oven temperature
Inside oven cavity as measured by sensor over
650°F unlatched or 915°F latched
F3 Open oven sensor (over 2900 ohms)
F4 Shorted oven sensor (under 950 ohms)
F7 Shorted key
F8 EEPROM data shift failure
F9 Cooling fan stalls or other cause of open thermal
switch
CX Communication Error
C1 Communication Fail with Upper Relay Board
C2 Communication Fail with Upper Temp Encoder
C3 Communication Fail with Upper Mode Encoder
C4 Communication Fail with Lower Relay Board
C5 Communication Fail with Lower Temp Encoder
C6 Communication Fail with Lower Mode Encoder
FC Door Latch Error
Note:
• To clear F codes, while in the F code mode, press COOK TIME and DELAY START simultaneously for 3
seconds.
• F2 through F8 - If sensor, wiring connection, relay board, and airfl ow check OK, replace the logic board.
• F9 - If cooling fan, FAD, and airfl ow check OK, replace the relay board.
• If the initial set temperature displayed differs from the selected temperature, replace the temperature
encoder board.
• If the door lock circuitry checks OK, but the door lock motor runs continuously, replace the logic board.
MEANING
– 49 –
CAUSE / CORRECTION
Welded relay contacts on the relay board
Airfl ow to rear of unit
High resistance in oven sensor leads and/or
connectors (especially at sensor in rear)
Disconnect power. Disconnect sensor harness from
control. Measure sensor resistance (white leads) to
be 1080 ohms at room temperature with 2 ohms per
degree change.
Look for damaged harness terminals if not a bad
sensor.
Disconnect power. Disconnect sensor harness from
control. Measure sensor resistance (white leads) to
be 1080 ohms at room temperature with 2 ohms per
degree change.
Separate sensor from harness to determine fault.
Check logic display assembly. If rubber button pad is
misaligned, correct; otherwise, replace logic board.
If repeated, replace logic board.
Suspect stalled cooling fan or airfl ow to control area.
Check harness fi rst and then replace component
indicated by CX error code.
Inspect door latch and circuitry. Replace if switches
are defective.