Dryer gas burner valve solenoid set. If the dryer does not heat or heats intermittently the coils could be defective. To test, watch the burner and if the igniter glows for a while and then shuts off without the gas igniting, it usually means one of these coils is bad.
High limit thermostat, L225-40F
Dryer heating element kit with thermostat, thermal fuse and wires, 240 volt
Cycling thermostat, L135-15F
3 wire cycling thermostat with pre-heater L138-155
High-limit thermostat, L255
Heating element kit with thermostat, thermal fuse and wires, 208 volts
Cycling Thermostat, L140-15F