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After reading your post I can't help but wonder, have you checked to insure the dryer has 240vac going to it. These dryer's will appear to work almost perfectly with 120vac, with one exception...you guessed it, No Heat !
If you know the location of your homes service panel go to it. Locate the 30amp breaker and turn it all the way "off" and then all the way "on" do not just identify it and assume it is ok because ot doesn't appear "tripped".
This happens all to often when I go to a customers home. The first words out of there mouths is "It's not the breaker I checked" and then I physically check "reset" the breaker ( after verifying the dryer is only receiving 120vac and not 240vac with my meter ) and what do you know, heat !
That could be the problem all it's own. The other thing to look for is a poor connection ( loose and burnt or badly oxidized...or both ) on either of the "hot" cord lines coming into the unit, either the red or black.
Let me know what you find out, but that's where I'd be looking before installing anymore part's.
The motor has to be running for voltage to exit the motor going to the heater. With the back off the dryer and the motor running you should read 220 volts at the heater if all safetys and thermostats are good. There is a thermal cut out relay on the heat canister. It must read continuity also. Remember you must remove at least one wire from each component being tested to get a true open or closed reading. If a wire is left connected you get a false reading. The heating element could be broken and part of the heater wire touching the canister. This would cause a continuity reading and still no heat. Finally, yes,the centrifugal switch in the motor could be bad and not sending power to the heater on the red wire.
Here are a few ideas of what might be wrong.. based on your description.. You've bypassed the thermal fuse and the dryer worked however once you removed the bypass, did it work after that? based on your symptom.. it appears that one of the auto-ressting 'overtemp snap switches' may be your problem and may be shutting your system down because it is tripping from excessive heat or it is prematurely tripping because it is defective. I've included a website link that shows assembly drawings and parts breakdown for you to examine but I suspect that you have a bad overtemp switch.. ( I assume that you've cleaned out all lint etc from the vent system both inside and outside the dryer) If you haven't... then you may not get adequate air flow and you truly are getting an overtemp condition.. Good luck.. Here is the link http://www.pcappliancerepair.com/model-display.php