Diesel Heater Error 10 – Warms Up but Then Stops

I installed a basic eBay diesel heater in our caravan about five years ago, and to be fair, it’s been faultless ever since. That is… until last weekend. Thankfully it wasn’t freezing cold, because the heater suddenly became unreliable when we needed it most.

The symptoms were confusing.

The heater would start up normally, blow warm air, and even sound like it was running properly — but after a short time it would shut down. After the second failed start attempt, Error 10 would appear on the controller.

It felt like the heater wanted to fire but just couldn’t quite get there.

Common Causes of Error 10

At this point, a few possibilities came to mind:

• Carbon or soot buildup inside the combustion chamber
• A failing glow plug
• A blocked or degraded atomiser (burner) screen

The challenge was that the heater was installed tightly in the van, and I didn’t really want to pull the whole unit out unless I had to. So I decided to start with the simplest and most common failure point.

The Fix That Solved It

I removed the glow plug and inspected the small atomiser screen that sits beneath it. Sure enough, it was partially blocked. I replaced the screen, reinstalled the glow plug, and fired the heater back up.

Problem solved.

The heater ran perfectly again, with no Error 10 and no shutdowns.

What was happening is that the blocked screen was restricting fuel flow, preventing proper combustion. The heater would start, warm up briefly, then shut itself down because it couldn’t maintain a stable burn.

One Small Part, Big Impact

It’s amazing how such a small component can cause a complete heater failure. If your diesel heater:

• Starts normally
• Blows warm air briefly
• Then shuts down with Error 10

This is one of the first things you should check before assuming the worst.

A simple screen replacement can save you a lot of time, frustration, and unnecessary part swaps.