I have a Whirlpool electric dryer M/ WEP5300o that will not heat. I have replaced the Cycling Thermostat, High limit thermostat, Thermal fuse and heating element. It still doesn't heat. There are

It could be a number of things, but i would start with these first:
THERMAL FUSE.
The thermal fuse is designed to prevent the dryer from overheating. Once a dryer's thermal fuse has blown, it is no longer of any use. If your dryer's fuse is blown, you will have to replace it. Open up your dryer's cabinet and locate its thermal fuse so that you can test it.

There are also a couple of 'thermostats' that could be the problem:
The 'high limit thermostat' is a safety device mounted on the heating chamber and is designed to prevent the dryer from overheating when the exhaust vent is restricted. A restricted vent will cause the high limit thermostat to trip or activate, interrupting the circuit to the heating element or gas valve. The high limit thermostat is not designed to activate repeatedly like a cycling thermostat and will eventually fail causing a no heat symptom. Disconnect the power to the dryer and check the thermostat for continuity with a multi-meter. If there is no continuity then it will need to be replaced and the restricted vent system corrected as well.
OR:
Cycling thermostats control the temperature inside the dryer drum. They are designed to "cycle" the heating element on and off to maintain the correct amount of heat. Cycling thermostats are normally located on the blower housing or elsewhere in the internal airflow ducting. Over time, the cycling thermostat can become defective. Disconnect the power to the dryer and check the thermostat for continuity with a multi-meter.
I hope this helps you fix the problem.

Hi.

If dryer is electric check for lint obstructions, check ventilation, test thermal fuse, thermistor, cycling thermostat and high limit, element and fan.

If dryer is gas check for lint obstructions, check ventilation, test thermal fuse, thermistor, cycling thermostat and high limit, igniter, coils, burner, flame sensor and fan.

The cycling thermostat must also be replaced when replacing the thermal fuse. The cycling thermostat's failure to cycle off the heating element results in overheating of the dryer which consequently blows the thermal fuse open.




Replacing only the thermal fuse should the dryer stops running and fails to start will result in its premature blowing or even the thermal cut-out (cut-off) located on the heater duct. Like the cycling thermostat, the high-limit thermostat must also be replaced once the thermal cut-out blows open. Refer to the parts diagram in the link below and look for item numbers 31(thermal cut-off), 34(hi-limit thermostat), 39(thermal fuse), and 41(cycling thermostat.

Kenmore Series 70 Electric Dryer (110.74722400) Bulkhead Parts

It doesn't necessarily mean the heating element is busted when an electric dryer stops heating. The heating circuit is not just composed solely by the heating element, it is composed by the thermal cut-off, high-limit thermostat, cycling thermostat, motor centrifugal switch, and the timer. The first thing to look at when an electric dryer stops heating is the thermal cut-off. It cuts power to the heating element when it blows most likely due to the failure of the high-limit thermostat. The thermal cut-off must be replaced, together with the high-limit thermostat, if found open. Click on the link below for the detailed instructions in troubleshooting this problem.

Troubleshooting Whirlpool and Whirlpool-Made Electric Dryers (Filter on Top and with Removable Back Panel) Running But Not Heating

The thermal cut-off at the top of the heater duct/housing blows when the high-limit thermostat below it fails to cycle the heating element on and off properly to regulate the heater temperature. This thermal cut-off along with high-limit thermostat including the cycling thermostat on the blower housing are wired in series with the heating element and power to it is cut when the thermal cut-off blows as a safety feature to prevent fire. Verify this condition by bypassing the said components. Click on the link below for the detailed instructions in troubleshooting this problem.

Troubleshooting Whirlpool and Whirlpool-Made Electric Dryers (Filter on Top and with Removable Back Panel) Running But Not Heating

The heating circuit is basically composed of the heating element, thermal cut-off, high-limit thermostat, cycling thermostat, and the motor centrifugal switch. The problem is very likely in the thermal cut-off and the high-limit thermostat located on the blower housing. The thermal cut-off blows when the high-limit thermostat fails and cuts power to the heating element. Both the thermal cut-off and the high-limit thermostat need to be replaced if the former is blown open. Click on the link below for the detailed instructions in troubleshooting this kind of problem.

Troubleshooting Whirlpool and Whirlpool-Made Electric Dryers Running But Not Heating

The thermal fuse is not a part of the heating circuit which is composed of the heating element, thermal cut-off, high-limit thermostat, cycling thermostat, and the motor centrifugal switch. The most common part that causes the dryer not to heat is the thermal cut-off and/or the high-limit thermostat. Verify this condition by bypassing the said components. Click on link below for the detailed troubleshooting and repair.

Troubleshooting Whirlpool and Whirlpool-Made Electric Dryers Running But Not Heating

It doesn't necessarily mean the heating element is busted when the dryer stops heating and the thermal fuse is not part of the heating circuit, it is part of the motor circuit. The heating circuit is basically composed of the heating element, thermal cut-off, high-limit thermostat, cycling thermostat, and the motor centrifugal switch. The most common part that causes the dryer not to heat is the thermal cut-off and/or the high-limit thermostat. Verify this condition by bypassing the said components. Click on the link below for the detailed instructions. Indicate the exact model number of the dryer should you need further assistance.

Troubleshooting Whirlpool and Whirlpool-Made Electric Dryers Running But Not Heating

The problem is likely in the thermal cut-off (cut-out) and the high-limit thermostat located on the heating element housing. Verify this condition by bypassing the said components. Disconnect power then remove the rear access panel to access the thermal cut-off (cut-out) and the high-limit thermostat. Disconnect the wires of each component then connect them together and insulate it properly. Reconnect power then start the dryer. The problem is indeed in the thermal cut-off (cut-out) and the high-limit thermostat if the dryer heats up. Replace both parts and it should solve the problem. It is an easy and cheap repair to make.



The thermal cut-off (cut-out) and high-limit thermostat are sold as a kit with part number 279816 and costs about $30.

In case the dryer still doesn't heat up with the thermal cut-off (cut-out) and high-limit thermostat bypassed, bypass the cycling thermostat then replace it if the dryer heats up. Check the heating element for broken coils if the dryer still doesn't heat up with the three components mentioned above bypassed.

your cycling thermostat needs changed too. the thermal fuse is your last safety measure that goes, which means your cycling thermostat is not shutting down the heat element once it detects the right temp hot air in the blower housing so it let the heat element glow until either the high-limit sensor shuts the heat down or the thermal fuse blows. Change the cycling thermostat and good luck