GE Profile Gas Dryer does not dry clothes after 4 hours. Thermostat?
GE Gas Dryer is warm but not hot. The dryer can run for 4 hours or more and the clothes do not dry. Is it a Thermostat?
My initial guess is the heat sensor. It tells the dryer when to kick on the gas.
However, if it's only getting warm, perhaps you have a problem with the amount of gas coming in (too little). Check that the gas valve is open all the way.
If that's good, you might have blockage in the exhaust vent. Check to make sure it's clear.
[Source: I've had both of these problems.]