Hi Jen. We have also had the same problem with our Hot Point Condenser Dryer (5 years + old ) Cleaned It all out first. Element had burnt out. Having to replace that (£42) then to find it still would'nt heat up, was told to replace the Thermostats (sold in a pair £20).Worked O.K. for a day then stopped heating up again. Found out that the thermostat which has a green spot on it (may differ on other models ) is resetable if it's showing to be concaved.
If this is the case to drop it on the floor a few times till it's not concaved any more. Did just that, fitted it back in all A.O.K. again now.
Best of luck.
ROB
September 2009