You have this listed under "Front Load Washer" and don't explain which type of of dryer you have (Gas or Electric). I'm assuming this is an ELECTRIC dryer, since you mentioned a thermistor
. The following link will explain how to troubleshoot your dryer no heat problem:
The symptoms of a dryer no heat problem are, the dryer drum will still spin, the blower fan runs, and all indicators function, but the dryer does no heat. If this is the problem you are encountering, then the link I provided for you should help you find your cause.
The first step to troubleshooting this problem is to check the voltage at the wall receptacle across the two hot leads (the two large slots in the receptacle - each leg to neutral reads 110-120VAC). A reading across the two hot leads should yield 220-224 VAC. If the voltage is incorrect, this can cause the heating circuits to fail, but allow everything else to work. I have seen where one leg of the 220VAC circuit is tripped or not working at all and causes the wall receptacle to read 1/2 the normal voltage that is required. This could be a problem with the circuit breaker panel or wiring in the wall receptacle. The heating circuits require 220VAC to operate, while the controls and drive motor only use 110-120VAC. If the voltage is correct at the wall, check the voltage at the terminal block in the back of the dryer. This is where the power cord attaches. If the voltage is correct at the terminal block, the problem is in the heating circuits. If the voltage is not correct at the terminal block, you may have a bad power cord.
NOTE: Please ensure you UNPLUG the dryer when replacing any internal components. Dangerous voltages are still present with the unit turned off.
Now...what controls the heating circuit in a Whirlpool manufactured dryer is the Thermal Cut-Out (TCO), the Hi-Limit Thermostat and the Heating Element. I'm assuming you replaced the TCO(?). If you did, it is recommended that you replace the TCO
along with the Hi-Limit Thermostat. Failure to do so can result in premature failure of components you may have already replaced.
The link I provided explains all this. Please read through the information I provided and let me know if you have questions. If you require further assistance, please let me know before you rate the solution. I hope this helps you resolve your problem.