Dryer moister problem.

In the apartment building where I work, we have stackable washer/dryers installed. The dryers are gas. We have had the duct cleaned out several times in the last few weeks to be "sure" that they are not clogged. The problem is that the tenant (same tenant) complains that there is moister inside her dryer, or on the outside door of the dryer. We cannot find any reason for this. The vent pipes are 4" pipe that gang into a 6" pipe farther down the line. We had been told that that was our problem, but it has been hooked up the same for twenty years without a problem. It is occurring in two buildings (separate tenants, of course). We only use Whirlpool appliances and are completely at a loss.
I was wondering if you had ever heard of such a problem?
In one of the apartments, we switched out he washer/dryer unit, but they still call with the same problem. I personally haven't seen the water that has formed, because when we get there it is dry. We can't duplicated the problem, thus, cannot fix it. It seems to happen once every three weeks.
I had read that it could be a by-product of the gas, but it is only happening in 1 unit out of 6 and the gas is run in the same pipes for all the units, so wouldn't they all show this problem if it is the gas?
We've checked the units several times. We had a Whirlpool repair person check it and everything is working correctly.
Could it be just a tenant with a loose canon?
argh. Thanks for reading.
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Makes me wonder if there is some other source of moisture, and the dryer is taking the blame?
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If you can't see it, you can't fix it. Could be a lot of reasons so you have to check the circumstances. When does the moisture actually occur?
Natural gas does contain water and it will condense when burned. If there is a cold draft near the dryer it is possible that would condense it. The dryer is blowing air out of the building so air must be sucked in from some place. If the laundry room is closed up, it may be sucking colder air from along a vent or other opening to the outside.
Moisture inside the dryer is a tough one. Does it happen after she runs it, or is it there before she actually uses it? If that is the case, it may be cold air coming back through the vent and causing condensation. Do they run a humidifier? Laundry room doors open or closed?
What do these two tenants do that others do not? Do they run the dryer after someone takes a shower? Taking a shower and then having cold air coming from the vent can cause condensation.
My guess is t hat nothing is wrong with the appliance, but the right set of circumstances makes the condensation. The cure is probably something simple also, like caulking around a vent, opening a door during use, etc.
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Astriapo wrote:

should be the clue that something is wrong outside of the dryer.........dryer vent separated or clogged? AC vent that blows cold air onto the dryer? The outside of the dryer would have to be cooler in order for condensation to form on it, right????? That seems highly unlikely. Do they run a dryer cycle on "air only", the air is cold and the room humid?

moisture problem occurs and where, exactly, the moisture appears.

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Maybe very tight room. One dryer blowing out, the replacement air is coming in the other vent, cooling the other dryer.
Open a window a crack?
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Christopher A. Young
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