Disclaimer
I'm not very sure about the stack where I'm suppose to post my question (between here and "Home Improvement" stack.)
Question
A few days ago my oven started beeping repeatedly when it was powered on.
The beep is the power-on bit.
After taking the oven apart I noticed that what I am assuming to be a heat probe had a burnt wire.
This probe is supplied directly from the current input (brown wire), this same wire then continues to the oven control console. If I unplug the probe the oven does not work (which makes sense.)
I have two question:
- How can I test this probe to be sure that it is not the one causing the problem?
- Can I find this part on the internet if I have to change it?
Pictures
Best Answer
It appears to be a contact resistance failure of the 1/4" Quick Disconnect type plug causing a temperature exceeding the hotplate to melt the plastic.
When this contact loosens from vibration and increases it's contact resistance sufficiently at the heater current to cause a temperature rise, oxidation process increases and at some point resulted in a thermal runaway that caused failure.
The solution requires a very low resistance wire crimp to be made which requires a tool and some skill to ensure either wire or wire + insulation crimp is made so that the contact is gas tight.
Find a technician who knows how to crimp these very common equivalent plugs. The exact same is unlikely to find easily with this plastic at right angle.
however one can replace it with
The wire must pass a 5 pound (>2kg) pull test from the connector to ensure a reliable connection. The plug must fit tight on the thermal switch. If the vertical orientation is a problem, it may be pre-bent with care.