The timer on my Maytag DG212 dryer sticks and does not advance so it just keeps running.

Sounds like you need new timer

I thank you need a new Timer part# 3979617

Turn the breaker to the dryer completely off and back on again. Also check that nothing is blocking the venting. Remove the vent hose and run the unit if you are not sure. Make sure the lint trap is cleaned first. It probably is neither element nor timer since it is heating and quits without the timer advancing completely.

I have looked at your dryer schematic. The only thing that moves the timer forward towards the end of cycle is the timer motor. You are going to need a new timer, looks like they have one for 54 bucks HERE

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Normally if you have an automatic cycle that turns off the dryer when the clothes are dry, it will do it with a special thermostat or moisture-sensing system. The thermostat tells the dryer to heat until the interior of the dryer reaches a "pre-set" temperature.
When the dryer reaches the pre-set temperature, the thermostat tells the timer to begin advancing. If there is a moisture sensor, the timer advances only if the moisture content of the clothing is low enough. The timer advances until the interior cools, then the termostat tells the timer to stop advancing, and tells the dryer to start heating again. This cycle continues until the clothes are dry. But... if the vent is clogged, the dryer may never reach the proper operating temperature, so it doesn't send the signal to the timer and the dryer continues to run indefinitely, even if the clothes are completely dry. To fix this problem, clean the vent and/or internal ductwork and make sure the vent is not compressed or kinked. If that doesn't work, then your thermostat, moisture sensor or timer could be the culprit.
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temp selection switch is defective, replace.
nbcrca:)

Your dryers timer contacts have fused to gether.
The only repair is to replace the timer.

Most likely.  More likely the timer motor

hi there,

the timer is actually a mechanical switch. sounds like you have answered your own problem. it's time to replace the timer.

jefo, it sounds to me like your timer is not advancing. Does it move at all or stay in place? In what you are saying it will stop when you turn it to off, I would think it could be the timer that is the problem. Part # 53-1810.