Problems with G.E. dryer DBXR453

This is a fairly new dryer. I bought it used several months ago and it worked fine for awhile but now has some problems.
Here are the symptoms.
on any non-timed setting it does not shut off. The knob never moves.
on timed settings, the knob moves and it shuts off like it is supposed to
It also doesn't seem to be heating to well. Towels need to run through several times(90 minute cycles on cotton)
What do these symptoms seem to indicate?
I really appreciate any help anyone can give me with this.
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Don't know about the timer, but long cycles could be caused by low voltage. Check your line voltage with an AC Voltmeter. It should be 240 V.
Some apartments and other multi unit dwellings (in North America) are wired for 208 V.
Also, poor venting could cause the long cycle time. Do you have an outdoor vent? Is it clogged full of dust?
Beachcomber
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Jethro wrote:

Hi,
That is part of a full model#. http://www.applianceaid.com/model.html Some model# helps.

Gas, electric?
A copy:
Q - Dryer takes too long to dry or multiple times to dry a load
A1- Pull the dryer out away from the wall. Unhook the vent from the dryer completely. Do not put anything over the dryer exhaust on the back of the dryer. Do a normal load with the vent unhooked. If it dries better or ok like this then the problem is in the dryer venting. Like a blocked vent pipe or a smashed or restricted vent hose.
A2 - If the vent doesn't make a difference, then check the blower wheel for excessive lint build up, check that there isn't anything stuck to the air intake baffle inside the drum, (i.e. the screen on the back wall of the dryer when looking into the drum). Check the lint filter chute for blockage. Check that the heating element isn't shorted to ground ( http://www.applianceaid.com/grounded.html ). Check the exhaust temperature of the dryer. A meat or pocket thermometer ( http://store.yahoo.com/cgi-bin/clink?a-1appliance+tSwkBf+pocther.html ) can be used for this. It should cycle approx between 120 degrees and 150 degrees. Check that the drum seals are not worn out.
jeff. Appliance Repair Aid http://www.applianceaid.com /
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