Ako je krajnja cijev za ispušne plinove blokirana ili nije moguće dovoljno prozračivanje, otrovni ispušni plinovi, posebice ugljični monoksid, mogu ući u vozilo. To je npr. slučaj u zatvorenim prostorijama ili kad vozilo zaglavi u snijegu.
Zapaljivi materijali, npr. lišće, trava ili grane, mogu se zapaliti.
Ako je strujanje toplog zraka blokirano, dodatno grijanje može se pregrijati i isključiti.
Pogon pomoćnog grijanja/prozračivanja opterećuje akumulator vozila.
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pri prvom puštanju u pogon
nakon prekida napona (npr. ako je akumulator bio odvojen)
nakon što je došlo do smetnje u radu.
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