GE JCKSO6 Technical Service Manual page 31

Model JKP86
FAILURE
CODE
-F0-
-F7-
2. Disconnecting Ribbon Cable from control and waiting at least 3 minutes to see if Code
recurs.
• If code recurs, problem is in the control. Replace control.
• If code does not recur, problem is with the Key Panel.
-F2-
• Control senses oven temperature
above 615°F with the door circuit in
the unlock mode.
• Control senses oven temperature
above 915°F with the door in the
door locked mode.
-F3-
-F4-
-FF-
Models JTP48 and JKP48
FAILURE
CODE
F0
F2
F3
F4
F5
F7
F8
F9
MEANING
Stuck key pad
Determine if problem is with the Key Panel or Control
may mean relay is
by:
turned on.
1. Pushing CLEAR/OFF pad,
Indicates that oven is over
temperature in one of the
following modes within
either a cooking or clean
mode of operation.
Open or shorted sensor
(circuit). Could be a result
of contamination on
terminals or pinched wire in
sensor circuit, cold solder
joint on control.
Loss of door motor safety
circuit.
MEANING
CORRECTION
Determine if problem is with Key Panel or Control by
Shorted OFF key
disconnecting ribbon cable and measuring flat cable
pins 7–12. Should be to probe side with conductor.
Should be 125–1750 ohms while pressing OFF key.
Oven temperature inside oven
cavity as measured by sensor
over 650°F unlatched or 915°F
latched
Open oven sensor • Disconnect power. Disconnect sensor harness
(over 3000 ohms)
• Look for damaged harness terminials if not a bad
Shorted oven sensor
• Disconnect power. Disconnect sensor harness
(under 950 ohms)
• Separate sensor from harness to determine fault.
Sensor circuit supervisor
Replace control.
failure
Shorted matrix or Determine if problem is with Key Panel or Control by
START key disconnecting flat cable and measuring cable pins
using pinout chart. Allow up to 1000 ohms when
pressing a key.
EEPROM data shift failure If repeated, replace control.
Cooling fan stalls or other Suspect cooling fan (between ovens) or airflow.
cause of open thermal
switches in yellow or blue
latch leads
CORRECTION
• Look for welded relay contacts. (Heating
elements on in off mode.)
• Look for high resistance in the sensor circuit
due to high contact resistance (poor terminal
crimp, deformed terminals, loose connection
inside sensor tube) or intermittent solder
joint.
• Electrical noise interference in the sensor
circuit (ham radio, cordless phone, etc.).
• Disconnect power to range. Disconnect
sensor connector from control.
• Measure sensor resistance at control
connector (take care not to damage
terminals). Should read 1100Ω at room
ambient (approx. 72°F).
• Measure each sensor lead from connector
block to ground. If shorted, look for pinched
or cut wire in sensor circuit.
• Check connector terminals – Look for
deformed or corrosion on terminals.
Repair or replace.
• If all above is OK, replace control.
Replace control.
• Welded relay contacts
• Airflow to rear of unit
• High resistance in oven sensor leads/
connectors (especially at sensor in rear)
from control. Measure sensor resistance (white
leads) to be -1080 ohms at room temperature with
2 ohms per degree change.
sensor.
from control. Measure sensor resistance (white
leads) to be ~1080 ohms at room temperature with
2 ohms per degree change.
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