DS5 Auxiliary Heater Problem

Interesting. I have a DS5 as well, though I couldn't say what year offhand, and I had a similar problem last winter. Do you hear any unusual noises when you try to activate the parking heater? Any coolant leaks you might have noticed under the car?

No unusual noises, and no visible coolant leaks either. Did your issue also prevent the regular climate control system from heating up the cabin properly?

No impact on the regular climate control, thankfully. In my case, it turned out to be exactly what you're suspecting - the auxiliary heater glow plug was faulty. Replacing it resolved the issue immediately. I’d recommend getting yours checked by a professional. Cost me around 440€ all in.

Thanks for the confirmation. It seems my initial diagnosis was correct. I'll get it checked out and the glow plug replaced. Appreciate the insight.