If you find that the dryer heater is good and the wires going to the heater are not defective, then you should contact Appliance Repair McKinney TX or check the dryer control thermostat and the high limit thermostat, sometimes called the safety thermostat, or fuse link. Once again, with your meter set to read ohms, remove the wires to the thermostat and check them for continuity. Unlike the heater, when you read resistance across a thermostat, it will show zero resistance. If the meter blinks indicating infinite resistance, then that thermostat is defective. All Dryer control and high limit thermostats will have normally closed contacts. If you find that a high limit thermostat or safety thermostat is defective, you need to check for a dryer vent restriction. If all the high limit thermostats and safety thermostats are good then you must go to the next thing in the circuit. Making sure that the heater is now reconnected, and all the wires to the dryer thermostats are connected, the next thing in the heater circuit is the heater switch contacts on the centrifugal switch, attached to the motor. The centrifugal switch on the motor is designed to close a set of contacts allowing current to flow to the heater, when the motor comes up to speed. The easiest way to check these contacts is to use a jumper wire with alligator clips. Connect the jumper wire across the wires in the heater circuit on the centrifugal switch. It is not necessary to remove them from the switch.
Make sure that the dryer timer, and the temperature selector switch is set for heat. Now attach the leads from your digital multimeter, making sure that it is set to read ohms, to the left and right blades on the dryer cord. Some dryer cords are three conductor, and some are four. Either way, put your meter leads on the far left and right blades. If you read the resistance of the heater now, then you know that the dryer motor centrifugal switch is defective. If the meter still blinks infinity, do not remove the jumper wire from the motor centrifugal switch. We will leave it there to simulate that the motor is up to speed so that we can check the selector switch heat contacts, and the timer.
At this point, you will have to read the schematic diagram, and or the timer / electronic control sequence chart, for your particular model dryer. If a timer or electronic control sequence chart is not available, you will have to look at the wires attached to these items and follow them back. A dryer electronic control will either have a heavy duty relay on it, or have a separate heat control board with the relay on it. Either way, look for the heavy duty wires that run in and out of a relay. You can use an additional jumper wire across those contacts, again there is no need to disconnect them, to read resistance on your meter attached to the dryer cord. If you see resistance on the cord now, then you know that the relay was probably not closing.