- Fuse: Check the fuse for the heater and head unit. If the fuse is blown, replace it.
- Wiring: Check the wiring for the heater and head unit. Ensure all connections are secure and there is no damage to the wires.
- Heater control panel: The heater control panel may be faulty. Try to disconnect and reconnect the heater control panel. If this does not work, try to replace the panel.
- Blower motor: The blower motor may be faulty. Try to disconnect and reconnect the blower motor. If this does not work, try to replace the blower motor.
- Heater core: The heater core may be clogged or damaged. Try to flush the heater core with water and vinegar. If this does not work, try to replace the heater core.
- Ground Issues: Check all the ground connections to make sure they are making a good connection and ensuring the circuit can complete.
- Faulty Switch: Check the switch that turns on the heater and head unit. Ensure it operates correctly and is not damaged.
- Faulty Headunit: If all of the above options do not work, the head unit may be faulty. Have the issue diagnosed by a professional.
