Model JKP64GP1, 1992 build date. GE Wall oven / microwave combo.
A few years ago a electrical surge took out the control board. I replaced it With a NOS unit. Oven worked fine in broil and bake. F2 code is received 20 Minutes into self clean cycle. Replaced the oven temperature sensor. Same error. Checked resistance on new and old elements . Both read 16ohms at room temp. NOTE: This oven uses a 16 ohm sensor , not a 1100 Ohm Sesnor, GE part WB21X158. Decided not to worry about it as the oven worked.
Fast forward a couple of years, and now I need the self clean. My knees do not like kneeling on the floor to clean it!
Here is what I have checked. Oven works fine in broil and bake mode. I have set the temperaturea t the max 550*F and it worked fine . Temperature sensor resistance is 16 Ohms at room temp. Note that this ocven uses a GE WB21X158 16 Ohm sensor, not the more common 1100 Ohm sensor.
Door does lock. Door lock and unlock micro-switches work, as measured by continuity check. During operation, 3.7 VDC is supplied to the micro-switch, and 3.7 VDC is seen across appropiate micro-switch when in operation. This is measured at the control board pin connector. There is a fan that blows air across the top of the oven, in the cavity between the oven and microwave. This fan works, comes on at roughly 210 *F and there is no clogged filter screens anywhere in the fan ducting. Air is felt out of the cavity air when it is on.
Unit fails with F2 at 17- 20 Minutes every time.
Sequence of events.
Any temperature measurements mentioned were made at the oven vent using a IR gun pointed into the oven vent air space.
1. Touch Clean. CLEAN and 3:00 will be in the display with START flashing.
2. Touch Start. A Audible “Click” is heard and door lock motor starts and the display flashes “locked”. When the lock motor reaches full lock position, “LOCKED” stops flashing andis displayed steady. At this point the Unlock micro-switch is open (no voltage across the switch) and the lock micro-switch is closed (3.7 VDC measured across the switch, measured at the control board plug for this circuit.
3. Immediately on the door being locked Four audible relay "clicks" were hard from the control board relays, K1, K2 and K3
4. The broil element is on, 240 VAC measured at the broil element. The bake element is off, 0 VAC
5. At 210 *F the cavity fan blowing air across the top of the oven comes on as expected.
6. At 16:21 minutes, oven vent temperature average was 600*F plus or minus 10*F, a click was heard from the area of the relays. 2 seconds later the F2 error displayed.
7. When the F2 Error is displayed-Check:
a. Voltage at bake element 0 VAC
b. Voltage at broil element 0 VAC
c. Fan on blowing air into the cavity on top of the oven is on
It acts as if the system thinks the door is unlocked, even though Visual of the lock/ unlock switch, oven display, and voltage measurements at the board indicate it is locked.