I have a Viking cooktop with a fan that rises when the side button is pushed. The fan will no longer go up. How can I fix it?

I just finished researching the same issue for my 36" downdraft. It appears that the ost common problem is the little up/down switch.

Most folks on-line were being told that they had to buy the whole top unit for $500.00 plus labor. But an electrical engineerpointed out that allvikingparts.com sold a switch for about $60.00 delivered.

It seems that if one holds the switch for an extended period of time it can heat up and burn a connector - might be a coincidence, but my unit stopped working just after my 4 year old grandson visited for two weeks - I made the mistake of showing him how pushing the button would make the vent go up and down. So the switch probably got mre use in a week than it had in the eight years since it was installed.

You can simply peel your switch off with your finger nail ( it will stick right back). On mine I noticed that the center "wire" hade a dark line through it which probably indicates that it is "burned"

My part is on the way.

Hope this helps - $57.00 is much easier to swallow than $595.00