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Clothes dryer repair and support guides.

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Why does my thermal fuse keep blowing on my Whirlpool Dryer

I have a WED49STBW1 dryer that continues to blow thermal fuses, and we have not been able to identify why.

  • We’ve fully cleaned the exhaust ducts from the drier to the exterior wall.
  • We’ve fully cleaned the inside of the machine of all lint and blockages
  • We have replaced the High Limit Thermostat, Cycling Thermostat, Thermal Cutoff Switch, and the heating element itself.

The dyer still gets extremely hot to the touch even when used on the low setting, and still occasionally blows a fuse. What else can I try to get this device fixed.

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This sounds like the system isn’t reading the temp data right. this is keeping the coil on and thus burning out the thermal fuse. you may want to replace the temp sensor and check the wires for a pinched or wear spot. also the ends can get corroded. cleaning this off may also help.

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Hi,

Do you mean that you have replaced the “….Cycling Thermostat, Thermal Cutoff Switch, and the heating element itself” or not?

If not check that the Hi Limit thermostat (supplier example only) is OK and also that the resistance of the heater element is OK. I don’t know what the resistance value of the heater is, but research online seems to indicate that it is a 240V 5400W heater so the resistance is ~10Ω
Here’s the wiring sheet for the dryer that may also help in case it is a wiring problem

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Yes, we have replaced all of those items.

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@Sean Crow

I would check the wiring between the heater element and the high limit thermostat to make sure that it is not frayed and/or touching the chassis. Being intermittent could be a wiring insulation problem i.e. bared wire touching chassis sometimes and not other times due to vibration of the machine.

Looking at the wiring sheet, (linked above) there are 3 thermostats in the heater circuit, the hi-limit, the operating and the thermal cutoff. Any one of them can cut off the heater.

The operating thermostat is for regulating the temp, the high limit is for over temp and the cut off is a fail safe.

The thermal fuse monitors the exhaust temps.

For the heater to stay on until the thermal fuse operates without one of the other 3 disconnecting the heater first means that there is a circuit from the supply through the heater to an earth point (or neutral) after the heater but before the hi limit thermostat as it is the 1st thermostat after the heater in the heater operating circuit.

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the thermal fuse opens at high temp. The heater is controlled by the temp sensor. So either the heater is overheating too fast, maybe due to a ground short, the temp sensor isn’t working or miswired, or the control isn’t controlling.

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