Hi.

You need to check the door switch, the timer, wire harness and the motor.

Unplug the dryer.

Using the multimeter check continuity from C to NO at the door switch (door closed, one wire off the switch). If you read continuity - go to the next step. No continuity - replace the door switch.

Set the timer to TIME DRY. Contacts L-H, TM-N, L-M should have continuity.
Also the M-S when the timer knob is pushed in.
If the continuity tests out OK, check the wire harness to the motor and door switch.
Replace the motor.

Please post the serial number of the dryer.

Simon.