Appliance Repair Blog

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Model #RF378LXPQ0icon, this free standing range was operating properly, but recently when the customer started the self cleaning cycle, an error F5 E1 showed up on the display. Along with the error code came a continuous beep that would only stop when the circuit breaker was turned off them back on. A second attempt yielded the same results, so it was either get the right range parts and get it fixed or clean the oven by hand.

The F5 E1 error message indicates the latch motor was unable to lock the door. When the self clean cycle is started, the control board will turn on the latch motor which is mounted on the rear of this range. The motor is connected to a cam that transfers the motors motion to a rod that runs under the cooktop. This rod connects to the actual latch mounted behind the oven door. The control board will then monitor a position switch that is actuated by the latch motor cam. As the motor rotates, the latch will engage the door locking it in place just as the cam contacts the switch button. When the switch contacts close, the control turns the latch motor off and starts the cleaning cycle.

When diagnosing this failure, the error code gives us a good starting point to begin our trouble shooting. I removed the rear panel and started a clean cycle. Once the start button was pressed, the latch motor began to rotate, but didn't stop at the locked position. It continued to rotate three times and then displayed the error. I unplugged the range from the wall and using my meter, did a continuity check of the latch position switch (the one on the right). The switch was reading as an open circuit in standby and when I actuated the switch which tells me the switch has failed. The second switch on the latch assembly, by the way, is to turn the oven light off during the self cleaning cycle to protect the bulb. That way, if you leave the light switch on the control panel turned to the on position, that second switch will turn it back off. Good to know if you can't figure out why the oven light won't turn on.

With the failure down to the latch assembly, I checked the range parts to see if the switch came as a separate piece, but it looks like it's an entire assembly, and not individual parts. I removed the old latch after removing the two screws and six wires, then installed the new latchicon. Once all the wires were back connected to the proper terminals, I put the rear panel back on and plugged the range back into the outlet. Started a self clean cycle, but this time I heard the motor make one revolution and stop. The cycle started for the customer and a few hours later, I am sure the oven was nice and clean.


Anonymous said...

I found that the system will not even attempt to move the motor after it has one error with the latch. After the initial failure for whatever reason it will not reattempt...

I reset the oven by power cycling it at the breaker..

Then pushing the door shut tightly so the latch would have a easy time locking the oven worked fine..

I had previously replaced the latch assembly and the new one failed for the client in the same way. It is not the latch assembly. Its the software. If the latch assembly hangs once, it will never attempt it again until a power cycle.

TechnicianBrian said...

You are correct that once the control board fails to see the door lock, it will retain that information in memory only to be cleared by a powerdown of the unit. The latch in my post, however had a bad switch as indicated by the open circuit I measured with my meter. Thanks for the information as it is a good example of always cycle the power first before replacing electronic parts.

Anonymous said...

I took the back off and the wiring loom to the control panel was not secured properly and there were wire fouling the door latch motor. 1 inch of tape fixed the problem.

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