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Appliance Parts
Appliance Parts, Home Appliance Tech
Category: Appliance
Satisfied Customers: 256
Experience:  Appliance tech since 1992. Factory authorized
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I have a miccrowave/convection oven. Make: GE Profile convection

Resolved Question:

I have a miccrowave/convection oven.

Make: GE Profile convection oven
Model: jvm1790sk01

The issue I have with it is that unless I open the appliance's door or unplug the unit altogether, the convection fan inside keeps running. Everything else (microwave, convection cooking, vent fan) otherwise works. The convection oven does not come on (unless I set it to), only the fan runs continously.

I have called a technician in. He ordered and replaced the control panel and it did not resolve the problem. They are now trying to get manufacturer support but have not been successful.

Have you seen this before? What do you suggest I do?
Submitted: 1 year ago.
Category: Appliance
Expert:  Appliance Parts replied 1 year ago.

Appliance Parts :

Hi my name isXXXXX have been an appliance repair technician since 1992.
The unit will have a cool down period after you set it, but if it is coming on without setting it, you should have a damper micro switch stuck. It is located under the damper motor on the right side of the cabinet.
Here is a diagram of the unit :
http://www.searspartsdirect.com/partsdirect/part-model/GE-Parts/Microwave-Parts/Model-JVM1790SK01/0432/0123370/G0903227/00005?blt=06&prst=0&shdMod=JVM1790SK01

And the item is #1445 and part# WB24X10112

Also make sure it is the convection fan you are hearing not the cooling fan. This would be another issue all together. Also there are two thermostats mounted on the bottom in the right side of the cabinet , if one opens up it will cause the fan to stay on.

I hope this helps you determine the issue.

Let me know, before rating please, i will continue to help until you are happy.

Customer:

Thanks Rick. I'll take a look tonight when I get home and will get back to you.

Appliance Parts :

No problem, let me know.

Customer: replied 1 year ago.


I took the control panel and outer cover (underneath) out to see if I can reach the switch. The compartment houses the fan motor and transformer (behind the control panel) and is pretty tight so I couldn't locate the switch. I would have to more of it apart. I ordered the part anyway; it will be in late next week.


 


I can't see if I would have another/better access if I removed the unit from the cabinet. In your opinion, would I get better access by removing the unit from the wall cabinet?

Expert:  Appliance Parts replied 1 year ago.
Yes you would need to take the unit down, and remove the whole cabinet to get to the damper switch.
Appliance Parts, Home Appliance Tech
Category: Appliance
Satisfied Customers: 256
Experience: Appliance tech since 1992. Factory authorized
Appliance Parts and 8 other Appliance Specialists are ready to help you
Customer: replied 1 year ago.

At long last, my microwave/convection oven is fixed. You were on the right track. The problem was that the damper (part 4003 on parts diagram) that that triggers the switch in the closed position for convection, was somehow obstructed. In the closed position, the damper makes contact with the switch and turns the convection fan on. In the open position, the damper move away from the switch, opening the circuit (removing power) to the fan. Once the damper was freed from whatever prevented it from re-opening, normal operation resumed. No parts had to be replaced.


The location of the switch is a bit unclear from the parts diagram. It is actually at the top of bracket (part# XXXXX) at the front of microwave. Locating it made all the difference. Once I understood the mechanical aspect, I was able to eliminate the "electronics" as a root cause.


 


Thanks for your help.

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