Hvis udstødningsafgangsrøret er blokeret, eller det ikke er muligt at opnå tilstrækkelig ventilation, kan der trænge giftig udstødningsgas, især kulilte, ind i køretøjet. Dette er fx tilfældet i lukkede rum, eller hvis bilen sidder fast i sne.
Der kan gå ild i brændbare materialer, fx løv, græs eller grene.
Hvis varmluftstrømmen er blokeret, kan det ekstra varmesystem overophede og slå fra.
Brugen af parkeringsvarme/-ventilation belaster batteriet.
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ved første ibrugtagning
efter en spændingsafbrydelse (f. eks. hvis batteriet har været demonteret)
efter en driftsforstyrrelse
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