fault codes

VVKB diesel heater LCD control panel where error codes E01 to E19 appear

Jul 18, 2026

Self-check with some error of diesel heater Apollo-V1/ Apollo-V2

Every diesel heater error code points to one specific fault. This guide decodes E01 through E19 — what each code means, the most likely cause, and the step-by-step fix for both new and older heaters.

Warm campervan interior with a diesel air heater running while snow covers the window outside

How To Choose the Best Diesel Heater? Never Decide On Price Alone

The best diesel heater isn't the cheapest or the one with the biggest number on the box. Here's how to size it right, choose between an air and water heater, and spot the build quality that keeps you warm for years.

Pickup truck plugged into an engine block heater on a snowy winter morning

block heater / cold weather starting / coolant heater / engine block heater / engine preheater / Titan / winter driving

How Does an Engine Block Heater Work?

An engine block heater warms your coolant before you start, so your engine fires fast and wears less in the cold. Here's how each type works, how long to plug in, and how to pick the right one for your vehicle.