GE JCKSO6 Technical Service Manual page 29

Models JCK915, JCT915, JK915, JT915, JK955, JT955, ZEK938, ZET938, ZEK958, and ZET958
FAILURE
CODE
F0
F2
1. Inside oven cavity as measured
by sensor over 650°F unlatched
or 915°F latched
2. Cooling fan stalls while oven
above 650°F—open thermal
switch in yellow leads
F3
F4
F5
F7
F8
F9
Model JT912
FAILURE
CODE
-F0-
-F2-
1. Inside oven cavity as measured by
sensor over 650°F unlatched or 915°F
latched, or
2. Cooling fan stalls while oven above
650°F—open thermal switch in yellow
leads
-F3-
-F4-
-F7-
-F8-
-F9-
-FF-
MEANING
Shorted OFF key
Oven temperature
Open oven sensor
(Over 2900 ohms)
Shorted oven sensor
(under 950 ohms)
Sensor circuit supervisor
failure
Shorted matrix or START
key
EEPROM data shift failure
Cooling fan stalls while oven
above 650°F—open thermal
switch in yellow or blue latch leads.
switch in yellow leads
MEANING
Determine if problem is with Key Panel or Control by
Shorted OFF key
disconnecting ribbon cable and measuring flat cable pins
or open short.
2 - 11.
13–14. Should be open. Should be 100–150 ohms while
pressing OFF key.
OFF key.
Over temperature
• Disconnect power. Disconnect sensor harness from
Open oven sensor
control. Measure sensor resistance (white leads) to be
(over 2900 ohms)
-1080 ohms at room temperature with 2 ohms per degree
change.
• Look for damage harness terminials if not a bad sensor.
Shorted oven
• Disconnect power. Disconnect sensor harness from control.
sensor (under 950
Measure sensor resistance (white leads) to be -1080 ohms
ohms)
at room temperature with 2 ohms per degree change.
• Separate sensor from harness to determine fault.
Shorted matrix or Determine if problem is with Key Panel or Control by
START key disconnecting ribbon cable and measuring flat cable using
pinout chart. Allow up to 1000 ohms when pressing a key.
EEPROM data shift failure
Cooling fan stalls while oven above
650°F—open thermal switch in
yellow or blue leads.
yellow leads
Loss of latch motor safety circuit
CORRECTION
Determine if problem is with Key Panel or Control
by disconnecting ribbon cable and measuring flat
cable pins 13–14. Should be open. Should be 100–
<300 Ω while pressing OFF key.
150 ohms while pressing OFF key.
• Welded relay contacts
• Cooling fan stalled or blocked
• Airflow to rear of unit
• High resistance in oven sensor leads/
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.
Replace control.
Determine if problem is with Key Panel or Control
by disconnecting ribbon cable and power up
control. If no F code, problem is with key circuit.
If repeated, replace control.
Cooling fan or airflow to control area.
CORRECTION
• Welded relay contacts
• Cooling fan stalled or blocked
• Airflow to rear of unit
• High resistance in oven sensor leads/
connectors (especially at sensor in rear)
If repeated, replace control.
Cooling fan or airflow to control area.
Replace control.
– 27 –
<300 Ω while pressing