Question about Bosch Nexxt WTMC 3300 Electric Dryer
I have the same problem. Took apart the dryer, pressed the reset button on the heat sensor (the black trip switch that is connected to the chamber where the heating elements are, black sensor with a red button (NC175 ELTH imprinted on it) with red wire connected to either side). This sensor is beside the air exhaust pipe and right near the back, lower right.
I had exhaust air leaking into the dryer (due to the way the external exhaust pipe was connected to the dryer exhaust pipe. I corrected this and figured my problem was that because dryer exhaust air was "leaking" into the inside of the dryer, the heater + the exhaust air leak caused the heat to trip the temperature sensor.
Well, it worked for about 10 loads and the same thing happened i.e. the heat sensor was tripped.
Am thinking of first replacing the heat sensor (figure this may be cheap and easy). If this doesn't solve the problem, I guess I have to replace the heater thermostat, wherever that is.
Any thoughts out there?
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Posted on Jan 02, 2017
Common faults -
1 The heating elements can fail (meaning open circuit)
2 There are cut-outs (T.O.C's) that might need resetting
3 The thermostats (stats) can trip out or burn out (meaning opencircuit)
4 Moderntumble dryers also have sensors and pcb's (Printed circuitboards) thesehave programs that can fail and circuitry although most should produce an errorcode showing you were the fault is.
5 Faultyconnections and burned wires may also be the fault.
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Posted on Jan 13, 2010
SOURCE: Bosch Axxis Starts and stops
I have the same problem - did you ever find out if it is normal? a power saving option? mine dries fine, but does cut in and out continually. always has done this since new.
Posted on Mar 09, 2010
If you have a gas dryer.
The most common problem with a gas and no heat is the ignitor going bad...
Here is a tip that I wrote about that problem...
If your dryer is electric..
There could be a number of different problems...
Check out this tip that I wrote about this problem...
Posted on Apr 28, 2010
Could be either the heating element or the thermostat/s.
ALWAYS UNPLUG YOUR DRYER BEFORE ATTEMPTING TO DO ANY WORK ON IT.
Check to make sure you are getting full 220 Volt power to the dryer, if you are then:
Check your Wiring
Often the main wiring connection from the house, at the dryer, burns and the connection breaks. In this has happened to your dryer, you need to replace the power cord and the terminal block inside the dryer to which the wire is attached.
Check the Door Switch
If the door switch or the door-switch actuator is defective, the dryer won't work and you need to replace the failed component. The switch is inside the dryer main housing near the door frame. Sometimes you need to raise or open the top or front of the dryer to reach the switch. Check for continuity you should have none with door open, and should have a reading when closed. If not replace the door switch.
Check to make sure you heating problem is not a lint build up in the discharge hose or the dryer,as this condition can cause heater/thermistor problems such as overheating of the heating coil leading to failure of the coil and burnout of the thermostat/thermistor due to overheat.
Sounds like your problem may be with the heating coil. Remove the back/or front just under the door of the machine and try to locate the air duct going from the blower to the drum. Normally inside/outside the air duct you will find the heating coil and the thermostats/thermistors. Once you have located the heating coil, remove the two wires from it and check the coil with an ohm meter across the two terminals of the coil.
You should read continuity across the terminals, if not you will need to replace the coil as it is faulty.
If the heating coil is ok, then:
You can check the thermostat/thermistor one at a time by removing the two wires and taping them together with electrical tape or with an ohm meter to test the thermostat/thermistor. (Should have/show continuity)
If the coil heats up then replace the thermostat/thermistor.
(Thermal fuse.If it overheats the dryer will not operate. It's located on the blower housing. It cannot be reset. A vent clogged with lint can cause it to overheat. You can test it with an Ohm meter or continuity checker, if no continuity, replace it)
DO NOT LEAVE THE WIRES TAPED TOGETHER AFTER THE TEST.
This could cause a FIRE, as you have removed the safety of overheat from the machine.
Right after replacing a dryer element, always run the dryer on 'air fluff' / 'no heat', and go outside to verify there's plenty of air coming out your vent system.
If the vent's clogged, that new element can burn out very quickly.
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Posted on Oct 05, 2010
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