I recently moved into a new house and my fiance change the plug on my dryer from a 4 prong to a 3 prong. After that, the dryer seems to work, however it will not heat. Could he have made an error when switching the cord out, or is it more likely the heating element or thermostat???
A Model Number and Brand may help.
Check to make sure you have 240 volts at the receptacle.
Turn your breaker off/on slowly a couple times. Sometimes you can loose half the line without actually tripping the breaker. Depending which side goes out the unit will run but not heat.
Did he follow any directions re: the install sheet.
This probably would not cause your problem but make sure that a ground strap was added from the Neutral on the new cord to the machine’s frame.
This is a safety issue.