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Member Since 19 Aug 2006
Offline Last Active Sep 07 2013 03:33 PM

Topics I've Started

How is this Possible? Nutone Model 800 fart fan suddenly runs backwards!

25 August 2012 - 05:02 PM

As far as I know, this is impossible, but it has happened.

Today I tore down the fart fan in the family bathroom for its annual cleaning.

I took off the ceiling escutcheon and ran it through the dishwasher.

I removed the fan motor and I scraped, wiped, dusted and blew away all the caked on grotus, then added a drop of oil at each end of the motor and reinstalled it. I have done this annually for the last 14 years.

After reinstalling the fan, I turned it on just to make sure I'd plugged it in. I was greated by a blast of hot dusty air as the fan sucked hot air out of the attic and blew it into the bathroom.

It is a pretty small (.8) amp AC motor. It spins up nice and quiet, just like always, but it is turning backwards. The fan motor has a bracket that can only bolt on one way, and the motor/bracket assembly can only go into the ceiling mount one way, so it is simply not possible that I have installed the motor "upside down" or "backward".

While I "know" that switching polarity cannot change the direction of rotation of an AC motor, it is possible to reverse the plug on this motor, so I tried that. As expected, this did not change anything.

Can any of you suggest ANY way that an AC motor can spontaneously start running in the wrong direction?

The only thing I can think of is that we did have a power failure about a month back which caused the protection circuits of several of our electronic toys to trip, but I can't see how that would "reverse" an AC motor.

Maytag Jet Clean Model DWU7702AAM air dry/heat dry workaround needed

01 July 2012 - 08:09 PM

We NEVER use the "Heat Dry" option on our Maytag Jet Clean Model DWU7702AAM dishwasher, but a couple of months ago, someone pushed the "heat dry" button on the front panel and it is stuck in heat dry mode. I have verified that the heating mode really is working. I'd like to disable this.

What I would like to do is to identify the wires to the air/heat switch that activate the air dry mode, wire nut them together, and cap off the wires that activate the heat dry mode.

If the switch actually worked, I could just do a continuity test to figure this out, but I don't get continuity accross any of the terminals, so I can't tell what to jumper together and what to dike out.

If any of you have suggestions, I am one listening grasshopper...

Friggid-aire Gallery Tumble Action Dryer Follies, The saga continues....

14 June 2012 - 11:52 PM

My Frigidiaire Gallery dryer is beginning to remind me of my grandfather's shotgun, which shoots as well as the day he bought it in 1920 and I've only had to make a new stock, buy a new barrel, and have the action rebuilt.

Anyway, the story begins here http://appliantology...ermittent-heat/

and now I am fixing things I've fixed before.

The gas control solenoids died again, after only 6 years. The first pair lasted eight years, but I was a single guy when I bought the dryer and there was a lot less laundry then. Anyway, the dryer was firing on the first cycle and then the heat was cutting out after the first tumble action reversal. A quick check with the multimeter, yep, they've gone bad.

Second thing was we started getting these long streaky rust stains on light colored clothes. I'd seen this before, and since I had the front panel off, I took a quick look and the glide pads and the felt seal. The glide pads were essentially gone and the felt pad was pretty badly worn and covered with rust stains.

I suspect that the solenoids don't fail all at once, but when they go, we don't notice right away, we just say, "Hmmm, the clothes aren't dry yet and we run another cycle". Meanwhile, the damp clothes encourage a bit of rust on the lip of the drum, which then transferes to the clothes, which is made worse if the glide pads are shot and the clothes can get wedged in between the drum and the felt seal.

Anyway, a quick visit to the Samurai's part supplier, Sunday afternoon and the FEDEX guy showed up with the parts at 2:15 while I was in the middle of setting tile in the bathroom. Knowing that my darling wife was getting testy about both the broken dryer and the unfinished bathroom, I figured I could make points by knocking out the dryer RIGHT NOW...

Popped the hood on the dryer at 2:20 P.M., pulled the front panel, and promptly began cussing the last guy who replaced the felt seal (Yeah, it was me). The guy was way too carefull in making sure that the seal was securely glued on. It was a big chore to remove the worn out seal and glide pad. I finally used a freshly sharpened 3/4" wood chisel to cut away the old felt. (No, not one of my good Sorby chisels, the cheap hardware store brand chisel I keep on hand at my bench when I need something sharp for prying). Still, it took only about five minutes to get the old seal and pad off and scrape down the rim, about 2 more to apply the adhesive and about 2 minutes to attach the new seal and pad.

Note to Grasshoppers, the felt seal has one edge that is slightly chamfered. This goes on the outside, facing toward the dryer drum and makes it easier to slip the front panel back on.

While waiting for the glue to dry, I tackled the solenoids. Wisely, I had picked up a stubby Phillips screwdriver the last time I did this chore. Unwisely, I had taken it to school and it was still in my desk in my classroom, so I soldiered on with a regular length Phillips driver. Still, it was a 3 minute job tops and I totally understand why appliance repair people charge by the trip or the procedure rather than by the hour. With skill these jobs take mere minutes.

Anyway the instructions said wait 20 minutes for the glue to dry, so I took the time to pull the drum, vacuum out the the dust and grokus from every nook and cranny. Even pulled the cover off the squirrel cage and cleaned it out thoroughly. Mostly though, it was clean inside since I had removed the long snakey vent tube and replaced it with a straight, short (6") length of rigid pipe straight out the wall. No back pressure for my dryer...I added a dollop of grease to the drum hanger bearing and the tensioner pulleys, mounted the drum, restrung the belt (now that IS a pain) and decided the felt ashesive had dried long enough.

I reset the front and top panels, verified a smooth turning drum and a firing burner, and was back to setting tile in the bathroom by 2:45.

Maytag Dishwasher Model DWU7702AAM

12 March 2008 - 05:27 AM

...how to remove the upper spray arm from the machine.

There is a cruciform shaped gizmo in the center of the upper arm that appears to hold it in place, but I can't figure out whether to pull, or push, or turn, or pry in order to remove the spray arm.

I found good instructions here for the lower arm and so forth, but nothing for the upper arm.


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