Temperature Regulator

Richard for Model Number bosch wta 3500 dryer

Answer Hello Richard, This is almost always a ducting issue. Think of it this way, on the automatic cycles, the moisture sensors are looking for moisture. If there is a ducting issue, the same moisture is recirculated over and over. This prevents the sensors from ever running without sensing the moisture. During the automatic cycle, when the sensors see no moisture is the only time the timer motor is provided with power to advance. A few things to check are the duct behind the unit for a crimp, the outside hood where the air is exhausted, and if flexible is used through the entire length, a low part of the duct will fill with water, blocking the air flow. 

Don K for Model Number WTA3510US

Answer Hello Don, You will want to check continuity of the high limit thermostat. If no continuity then try to reset it and see if you have continuity. If it will not reset or if it trips again then you will need to replace the thermostat 170857. 

Marv

Answer Hello Marv! Unfortunately, the manufacturer does not list the cable assembly for the temp regulator 154166. Sorry about that! 

Diane for Model Number WTMC3300us/01

Answer Hi Diane. Use a ohm meter to make sure all thermostats are closed and not open. The heater assy needs to read ohms or shorted. Next to the NTC r-2 is a resettable thermostat w/ a red button in the middle that trips at 347° electric model. If it has tripped a couple of times, you need to clean your entire vent system along w/ the vent cap outside so no moisture gets back into the dryer and clogs the vent. This in turn will cause the heater to expand too hot and open the thermostat part # 422272. There is another thermostat part # 422177. Heater assy. part # 436460. The NTC's are temperature sensors. It comes w/ the heater assy. You will use a ohm/volt meter to test these individual parts part # TJMA-DM1. Thank You. 

Brian H. for Model Number wta3500uc/04

Answer Hello Brian. Here is what the manufacture recommends for the code. Hope this helps. Filter LED flashes, filter is clean. NTC R2 or NTC R4 defective. Remove the cable from the power module. Test NTC, cable and plugand- socket connection. NTC R2 is situated above the heater and measures the temperature of the process air blown into the washing. Temperature °C Resistance kW 25 18–22 60 4.5–5.5 NTC R4 is situated in the air current in front of the heater. Resistance values NTC R3 / NTC R4 Temperature °C Resistance kW 25 9–11 60 2.3–2.7