VW Nivus Parking Heater Failure & Error Code Alert

I had a similar issue with my 2017 VW Tiguan TSI last winter when the auxiliary heater failed. The ventilation system and blower worked fine, but the heater would not engage. The root cause turned out to be a faulty temperature sensor that was incorrectly reading the coolant temperature. This triggered a fail-safe mode in the car heater system. The repair involved: 1. Diagnostic scan to confirm the temperature sensor failure 2. Checking the heater core for potential coolant leaks 3. Replacing the temperature sensor unit 4. System reset and testing This was a moderate repair that took about 3 hours at the shop. While not the most serious issue, it needed immediate attention since a malfunctioning temperature sensor can potentially cause other problems with the engine management system. Based on your symptoms, it sounds very similar to what I experienced. The auxiliary heater relies heavily on accurate temperature readings to function properly. Would recommend having the temperature sensors checked first before looking into more complex issues with the heating system components.

Thanks for sharing your experience. My auxiliary heater started working again after fixing those issues. Curious how much you ended up paying for the repair? The climate control seems to be working perfectly now but wondering if you encountered any other heating system problems since the fix. My cost was around 450€ including parts and labor.

Good to hear your auxiliary heater is functioning again. I dealt with a similar repair on my Tiguan, ended up paying 440€ to replace a defective glow plug which was causing the malfunction. Since having that fixed at the mechanic, the heating system has worked flawlessly. No more issues with the heat control or auxiliary heater functions. The ventilation system overall seems much more responsive now, and I havent noticed any coolant leaks or temperature regulation problems. The repair has proven to be worth every cent, especially during the colder months. If maintained properly, these auxiliary heaters are actually quite reliable components.

Thanks for the advice. I actually just got back from the mechanic and wanted to share how it went. The diagnostic revealed a faulty temperature sensor, just as suggested. The ventilation system inspection showed everything else was working fine, no coolant leaks or heater core issues. Total cost came to 450€ including parts and labor, which seems pretty standard based on the responses here. The climate control is now working perfectly and the auxiliary heater starts right up. Really glad I checked here first, helped me avoid getting overcharged or having unnecessary repairs done. The heat control is actually better than before, and the whole job only took about 3 hours. Will definitely keep an eye on the temperature readings going forward, but feeling good about the fix.