Kenmore 790.80353310 installed Feb/2017 microwave exhaust fan and oven light stay on with door closed. removed cover. all switches and stats ok. do control boards quit this early?

SOURCE: After use, fan keeps running and control panel not working

Hi, this is a major chip fault. this chip is located on the control board and, it is responsible for initiating the cooking cycle correctly. you will need to replace the control board asap. it has failed.

William Miller

• 9179 Answers
• Posted on Dec 08, 2008

SOURCE: microwave door ...hwhen closed....oven light and fan will turn on

This is usually caused by either a bad door switch or a loose door switch mount (which are pretty simple problems to fix).

Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.

We have uploaded the R1480 service manual to our site here to help you.

If yours is a different model, please reply back.

The best place to order Sharp parts is Tritronics.

You can also call them at 866-779-5835.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

William Miller

• 9179 Answers
• Posted on Dec 08, 2008

SOURCE: Microwave won't function.

This is usually caused by either a bad door switch, a loose door switch mount (which are pretty simple problems to fix) or occasionally a problem on the control panel.

Even though a door switch clicks, it may still be bad inside.

Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.

Also see http://www.microwavedisplay.com/doorsw.txt

You can usually find exploded views and order parts by entering your model number at the Sears parts site.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########

There may also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

If you only need a switch, you can order a universal type here for $5 postpaid.

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

William Miller

• 9179 Answers
• Posted on Jul 20, 2008

SOURCE: microwave oven, ge profile model

This is usually caused by either a bad door switch, a loose door switch mount, or bad door hinge alignment.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. Other times, it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

One test that sometimes helps is to gently lift up on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

There may also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

We're happy to help you and we'd appreciate your thoughtful rating of our answer.

William Miller

• 9179 Answers
• Posted on Oct 12, 2007

SOURCE: Open Microwave Door and Fan comes on

Usually this is a problem with the door switches or a broken door switch mount.

Sometimes after a part replacement one will find a couple of wires have been reversed.

There should be a mini-manual with wiring diagram inside the oven behind the control panel.

If those are all correct, you may have a problem with the control panel, which we repair nationwide for $39.95.

If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk