Checking the technical condition
Verify the functionality of the PTC sensor according to the validation logic below.
1.Input method:
Set FLOOR mode (air supply to the floor area), for maximum heating.
Turn off the fan.
Press the air intake button more than 5 times.
Key LED flashes continuously at 0.5 second intervals (manual control).
The entire image on the LCD screen continuously turns off and on at intervals of 0.5 s (automatic control).
Check the operation of the PTC sensor for fan switch operation.
Manual mode: steps 1-4, automatic mode: steps 1-8.
Each PTC relay switches on at 3 second intervals.
The PTC sensor confirmation logic is completed within 30 seconds.
2. Cancellation method:
Press the air conditioner start button or the air supply control button.
Ignition off.
Automatic cancellation of the execution of the logical procedure after 30 seconds.
3. If the PTC sensor is not functioning, substitute a known-good sensor and test for proper operation. If the problem is corrected, replace the sensor.
Replacement
1. Follow steps 1-7 of section «Replacing the Temperature Control Actuator» of this chapter.
2. Disconnect the connector (A) heater with a positive temperature coefficient.
3. Loosen the fixing screws and remove the core (IN) heater.
4. Installation is made in the reverse order of removal.