http://doityourself.com/appliance/dryerproblem.htm#Level1_2
suggests the following possibilities:
If your dryer doesn't heat, check these:
Power from the house
Check to see whether there's power getting to the dryer. Is it plugged in?
Check for blown fuses or tripped circuit breakers--your dryer uses two fuses
or circuit breakers. The dryer could tumble but not heat if only one of the
two fuses is blown. If you have circuit breakers, one of the two circuit
breakers can trip, even if the two for the dryer are connected.
Heating element
Often a dryer heating element burns out, but doesn't trip the circuit
breaker or blow a fuse. The heating element is simply a long coil of special
wire. You can check it for continuity with an ohm meter. No continuity means
the element is bad and you need to replace it--electric heating elements
aren't repairable.
Thermal fuse
On many dryers, there's a thermal fuse mounted to the exhaust duct inside
the back cover panel. The fuse--which is about an inch long--is usually
embedded in black resin and mounted in a white plastic housing. If the fuse
has blown, you need to replace it. (You can't re-set it.)
Wiring
A common problem is for the main wiring connection from the house, at the
dryer, to burn and break its connection. Because the dryer can still tumble
with partial power, the connection may be only partially defective. You may
need to replace both the power cord to the dryer and the terminal block
inside the dryer that the wire is attached to.
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