Why did my dryer stop getting hot?

First, verify the voltage at the wall receptacle to ensure you are reading 220-240 VAC across the two hot leads (LEFT and RIGHT slots on the recepatacle). If the voltage is incorrect, the dryer may still run, but won't heat.

The number one cause of dryer heat related problems, or longer dry times, is poorly installed, or clogged ventilation. If you haven't checked the dryer ventilation or cabinet interior anytime recently, now might be a good time to do so.

A simple test to try is to remove the exhaust vent hose from the back of the dryer and attempt to dry a load of clothes as you normally would. The air escaping the exhaust should be forceful and warm (about 140 degrees).

If the air flow is normal, and your clothes dry normally, the problem is with your exhaust ducting from the point where it leaves your dryer to where it exits your home. I would recommend you inspect the entire length of your exhaust ventliation to make sure it is free of kinks or clogs if this is the case.

If the air flow is weak, then the problem is INTERNAL to the dryer. The most common source of the problem is a clog in the blower fan housing preventing air to flow properly. Remove the blower fan housing cover and clean as necessary. Make sure the blower fan can turn unobstructed.

If the dryer is running and you confirm there is sufficient air blowing from the exhaust, but still have no heat, the following link explains how to troubleshoot:

http://www.fixya.com/support/r630242-dryer_runs_but_not_heat

In the majority of cases, the Thermal Cut-Out (TCO) fails. The TCO and Hi-Limit thermostat are located on the outside of the heater box. If one or the other of these components is discovered to be bad, it is recommended that you replace BOTH of them. Failure to do so, can result in premature failure of any parts you replace.

Make sure you verify the dryer ventilation is clear prior to operating it with new components. If left in a clogged or poorly ventilation condition, the dryer will overheat to the point of failure. Not to mention, this can cause a fire hazard.

Let me know if you still have problems. I hope this helps you.