Tappan built-in just locks and unlocks itself
#1
09-27-05, 03:32 PM
Tappan built-in just locks and unlocks itself
I have a tappan, digitally controlled, built-in oven of undetermined age. None of the buttons are doing anything...the oven just keeps (electrically) locking and unlocking itself - as it would if in self-cleaning mode - and nothing else. The buttons don't even beep when pressed (except the "Time," "Cancel" and "Timer".
It did this once before, about a month ago, but started working again as unexpectedly as it had stopped. I took that opportunity to run it through a 4-hour cleaning cycle (in case that might help) and it worked fine for another couple weeks. It started the above behavior, again without warning, a few days ago. I tried killing the circuit-breaker to - maybe - reset something inside; it had no effect.
It did this once before, about a month ago, but started working again as unexpectedly as it had stopped. I took that opportunity to run it through a 4-hour cleaning cycle (in case that might help) and it worked fine for another couple weeks. It started the above behavior, again without warning, a few days ago. I tried killing the circuit-breaker to - maybe - reset something inside; it had no effect.
Last edited by rikbryant; 09-27-05 at 03:35 PM. Reason: Additional information
#2
09-27-05, 07:56 PM
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Hello rikbryant. Welcome to my Gas Appliances topic and the Do-It-Yourself Web Site.
Based soely upon the problem description as I read it, sounds like the touch pad is defective and/or the main circuit board is defective or shorted out in the cleaning cycle. Unplug the appliance and remove the touch pad and circuit board. Take them to the local appliance parts store for testing if no viable signs of damage are seen. Be sure to bring the ovens brand, model and serial numbers.
***Be sure the electrical power to the appliance is turned off, before attempting any repairs. Always check for gas leaks whenever the appliance is moved and/or a repair includes any connection of a gas part.
Kindly use the reply button to add any additional information and or questions. Any additional information you add will than remain within this posting. Using this method also moves or keeps your question at the top of the list automatically.
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Based soely upon the problem description as I read it, sounds like the touch pad is defective and/or the main circuit board is defective or shorted out in the cleaning cycle. Unplug the appliance and remove the touch pad and circuit board. Take them to the local appliance parts store for testing if no viable signs of damage are seen. Be sure to bring the ovens brand, model and serial numbers.
***Be sure the electrical power to the appliance is turned off, before attempting any repairs. Always check for gas leaks whenever the appliance is moved and/or a repair includes any connection of a gas part.
Kindly use the reply button to add any additional information and or questions. Any additional information you add will than remain within this posting. Using this method also moves or keeps your question at the top of the list automatically.
Web Site Host, Forums Monitor, Gas Appliances Topic Moderator & Multiple Forums Moderator. Energy Conservation Consultant & Natural Gas Appliance Diagnostics and Repair Technician.
Personal Reminder:
Buckle Up & Drive Safely.
"The Life You Save, May Be Your Own."
#3
09-28-05, 03:39 AM
Thank you for your reply. I can't imagine - since it worked again for a while after doing this before - that it was (although it MAY BE NOW) shorted out. I would be glad to remove the board (maybe even blow it out/off with compressed air, as I do computer boards to see if that helps) and get it looked at... IF I had any idea how to even get to it!
The only screws I even see are for the (apparent) spacer/cover at the top of the oven, which appears to serve as a space filler and vent. Is that where I can expect to be able to access everything else?
Thank you again!
Rik
The only screws I even see are for the (apparent) spacer/cover at the top of the oven, which appears to serve as a space filler and vent. Is that where I can expect to be able to access everything else?
Thank you again!
Rik
#4
09-28-05, 04:46 AM
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Hello: Rik
If you can more easily access only the locking device, dis connect it at the wire terminals. Be sure the wires that are removed from the device are taped over with electrical tape or placed in a position where they will not come into contact with anything metal. Doing this will bypass the locking device, the oven will or should still be useable except for the cleaning cycle.
Or remove only the locking device and replace it. That part may or may not be working correctly. Not likely the device but may be worth a try if more easily accessable. Ususally, to access the circuit board, the front panel has to be removed first. May be under the front glass panel which is held in place by the small screws around the decorative trim, etc.
If you can more easily access only the locking device, dis connect it at the wire terminals. Be sure the wires that are removed from the device are taped over with electrical tape or placed in a position where they will not come into contact with anything metal. Doing this will bypass the locking device, the oven will or should still be useable except for the cleaning cycle.
Or remove only the locking device and replace it. That part may or may not be working correctly. Not likely the device but may be worth a try if more easily accessable. Ususally, to access the circuit board, the front panel has to be removed first. May be under the front glass panel which is held in place by the small screws around the decorative trim, etc.
#5
09-28-05, 07:08 AM
I must be missing something. What good will disconnecting the locking mechanism do? None of the other functional (preheat, oven temp, cook time) buttons are working while this "lock, unlock, lock, etc." is going on.
#6
09-28-05, 05:56 PM
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Hello: rikbryant
You will need to remove the parts described prior. Easy Access ability aside,
you will have to find a way to access into the control panel area behind the front panel.
My initial thought was to bypass the locking device to stop the cycling. At least for the time being. May resolve that issue without a need to access the other more difficult parts.
However, likely that will not work. Thus the need to get behind the front panel (touch pad) to get at the circuit board, etc. Kindly excuse any confusion I may have caused you. Not intended to be confusing. More like I was hoping for or looking for a possible easy way to bypass the lock, yet still allow the oven to work.
You will need to remove the parts described prior. Easy Access ability aside,
(IF I had any idea how to even get to it!)
My initial thought was to bypass the locking device to stop the cycling. At least for the time being. May resolve that issue without a need to access the other more difficult parts.
However, likely that will not work. Thus the need to get behind the front panel (touch pad) to get at the circuit board, etc. Kindly excuse any confusion I may have caused you. Not intended to be confusing. More like I was hoping for or looking for a possible easy way to bypass the lock, yet still allow the oven to work.
#8
10-11-11, 03:40 PM
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I know this is 6 years later but this will work.
I hadthe exact same problem with what sounds to be the exact same tappan model.
1. Open door (keep plugged in.)
2. Look left hand corner of open oven, you will see a thin cylinder shaped piece of metal protruding from the ovens edge, Put thumb over it and push in on it, and the oven will think the door is shut.
3. Your lock should start moving back and forth Unlocking then Locking itself again if not hit clean set a time and it will start moving if malfunctioning like mine.
4. Hold the button while pressing bake as the lock is moving, then as soon as the lock is in the unlock position the bake light will turn on, immediately release the cylinder you are pressing down onto, the baking temperature should still be visible. If not repeat steps.
5. Unplug your oven and plug it back in making sure you do not hit clean before you set your clock hit cancel to set your clock the oven should work again.
Like yours my malfunctioned then began working all of a sudden I must have unplugged it when it was in the unlock position unknowingly. This only happens when I hit clean before setting the clock when power is out or I have plugged back in.
Anyway hope this helps someone.
1. Open door (keep plugged in.)
2. Look left hand corner of open oven, you will see a thin cylinder shaped piece of metal protruding from the ovens edge, Put thumb over it and push in on it, and the oven will think the door is shut.
3. Your lock should start moving back and forth Unlocking then Locking itself again if not hit clean set a time and it will start moving if malfunctioning like mine.
4. Hold the button while pressing bake as the lock is moving, then as soon as the lock is in the unlock position the bake light will turn on, immediately release the cylinder you are pressing down onto, the baking temperature should still be visible. If not repeat steps.
5. Unplug your oven and plug it back in making sure you do not hit clean before you set your clock hit cancel to set your clock the oven should work again.
Like yours my malfunctioned then began working all of a sudden I must have unplugged it when it was in the unlock position unknowingly. This only happens when I hit clean before setting the clock when power is out or I have plugged back in.
Anyway hope this helps someone.
