Service Information - GE JB905 Technical Service Manual

ERC Failure Codes
The presence of an "F" and a number or letter flashing in the oven control display indicates a function
Failure (F) code. (Note that the oven may stop operating but not immediately display an F code.)
F codes are stored in nonvolatile EEPROM memory until a second consecutive fault occurs. An F code
can be recalled by pressing together the TIMER, CLOCK (or 9) keys. While an F code is displayed,
pressing the 8 and HR DOWN (or 6) together will clear the displayed fault. A fault must exist
continuously for 5 minutes before an F code is recorded (F2 and F8 are recorded sooner).
FAILURE MEANING
CODE
F0 Shorted OFF key or an
open wire within the touch
panel wire harness.
F2 Oven temperature inside
the oven (as measured by
the oven sensor) is over
650ºF unlatched, or 915ºF
latched.
F3 Open oven sensor (over
2950 ohms).
F4 Shorted oven sensor
(under 950 ohms).
F7 Shorted key.
F8 EEPROM data shift
failure.
FF Loss of motorized door
lock.

Service Information

CORRECTION
Check continuity of wire harness that links the
touch panel to the ERC. If there is continuity
disconnect power and then the wire harness.
Reconnect power and if the F0 code is not
displayed the problem is with the key circuit.
Welded relay contacts, high resistance in oven
sensor leads (especially at the sensor in rear).
Replace sensor. If problem persists replace
the oven ERC.
Disconnect power and the sensor from the
oven ERC. Measure sensor resistance to be
1080 ohms at room temperature with 2 ohms
per degree change. Check continuity and look
for damaged harness terminals. If continuity
and harness terminals are ok replace the
sensor. If problem persists replace the oven
ERC.
Disconnect power and the sensor from the
oven ERC. Measure sensor resistance to be
1080 ohms at room temperature with 2 ohms
per degree change. Check continuity and look
for damaged harness terminals. If continuity
and harness terminals are ok replace the
sensor. If problem persists replace the oven
ERC.
Check continuity of wire harness that links the
touch panel to the ERC. If there is continuity
disconnect power and then the wire harness.
Reconnect power and if the F7 code is not
displayed the problem is with the key circuit.
Disconnect power. Reconnect power and if
problem is repeated replace the oven ERC.
Replace motorized door lock.
– 29 –