Dryer wouldn't shut off except with door open, now it won't run

If it does this in a Timed Dry setting the timer is bad. If it does this in an Auto dry setting it could be a bad moisture sensor or a bad timer.

Check the thermal fuse and thermostats again to eliminate them as suspects. Both should be zero ohms at room temperature. If you eyed the entire duct system from lint filter to outside of the house for lint, then these are probably OK.

One thing that will shut down a dryer: a defective door switch. If you turn the timer on with the door shut and can hear or see it progressing (running) then the door switch is OK.

If your door switch is operating marginally, the heat can expand the body of the switch and open the circuit (and shut the dryer off until it cools). Check the switch with an ohmmeter with the dryer disconnected from power.

A loose spade terminal on this switch (or anywhere else) can do this too.

Also, a misaligned door or defective door clasp might do this after heating up.

Keep thinking 'heat expands' and you might find it.

The only other thing left is a defective timer.

Good luck from Detroit, MI.

You will need to replace the timer....

http://www.fixya.com/support/r3907570-buy_appliance_parts_online

heatman101

is the heat working?when the dryer heats up and then the heat will shut off then the timer advances,when the heat turns back on the timer stops,heat shuts off the timer will move again,if the heat is working you could have a bad timer

Usually the only thing that will stop the dryer is to open the door or turn the timer to the off position.

Strange. Heaters usually shut down with the spinning drum when door is open. If you check the schematic for unit you can check to see if in fact this is correct operation. Attached site usually has schematics for appliances. You might want to check. Search Over 2 1 Million Appliance Parts

The elctrical contacts in the timer have welded themselves together or the notch wheel is broke in the timer; either way you need a new timer, and this also explains why it runs until you open the door.

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

REPL/ YOU BROKEN LID SWITCH ,, IS ON OPEN POSITION REASON FOR NO T SHUTTING DOWN////

The timer motor isn't moving the timer. You'll need to replace the timer. Turning the timer **** to off should stop the machine.
Exception: If the shutting the door automatically starts the motor, then the start switch/relay is probably shorted.