Customer had no heat. I replaced a faulty thermostat on a Dimplex Strorage Heater - an xl 9209 thermostat - The Storage Heater on Economy 7 only so I advised the customer to turn on power over night to charge up and set Input to Max. A few days later reports back the heater is not as hot as it used to be....Any suggestions before I go back to check it out? I assume the Output has been set to Max also!