GE JCKSO6 Technical Service Manual page 30

Model JT952
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-
Models JT965 and JTP86
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
Determine if problem is with Key Panel or Control by
Shorted OFF key
disconnecting ribbon cable and measuring flat cable pins
or open short.
13–14. Should be open. Should be 100–150 ohms while 5 - 14.
OFF key. pressing 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 leads
yellow or blue leads.
Loss of latch motor safety circuit
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.
13–14. Should be open. Should be 100–150 ohms while 13-14.
OFF key. pressing 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 leads
yellow or blue leads.
Loss of latch motor safety circuit
CORRECTION
<300 Ω while pressing
• 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.
CORRECTION
<300 Ω while pressing
• 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.
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