There could be several reasons why your Indesit tumble dryer is not heating up:
1. Faulty heating element: The heating element is responsible for generating the heat in your dryer. If it becomes faulty or damaged, it will not be able to heat up the air, resulting in no heat. You may need to replace the heating element.
2. Thermostat issues: The thermostat regulates the temperature in the dryer. If it is not functioning properly, it may not be signaling the heating element to turn on. You may need to check and potentially replace the thermostat.
3. Blocked or clogged venting system: A blocked or clogged venting system can restrict the airflow, preventing hot air from circulating and heating up the dryer. Check the dryer vent, vent hose, and lint filter for any blockages and clean them if necessary.
4. Electrical issues: Ensure that there is power going to the dryer and that the circuit breaker has not tripped. Check the power cord and connections to ensure they are intact and not damaged.
5. Malfunctioning timer or control board: If the timer or control board is not working properly, it may not be sending the signal to the heating element to turn on. In this case, you may need to replace the timer or control board.
If you are unsure about how to diagnose or fix the issue yourself, it is recommended to contact a professional appliance repair technician to safely and accurately identify and resolve the problem.