Why Do I Get an E8 Error on My Diesel Heater?
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If you’ve just installed your first diesel heater and see an E8 error appear on the controller during startup, don’t panic — this is very common on new installations.
What Does an E8 Error Mean?
An E8 error simply means the heater has not received enough fuel to ignite. In most cases, this happens because fuel has not yet fully reached the combustion chamber.
This is especially common on:
- First-time startups
- New fuel lines
- Fresh installations where the system hasn’t been primed
The Simple Fix
The solution is usually very straightforward:
Start the heater again — and keep running it until it ignites.
It can take several startup attempts for fuel to fully work its way through the pump and fuel line. Once ignition occurs, you’ll clearly hear combustion take place and feel warm air shortly after.
An E8 error on first startup is normal and nothing to be concerned about.
If the Error Keeps Coming Back
If the heater continues to throw an E8 error after multiple attempts, it’s time to check the fuel system more closely.
Things to inspect:
- Air in the fuel line
- Loose fittings or clamps
- Small nicks or cuts in the fuel hose
Air entering the fuel line will prevent consistent fuel delivery and stop the heater from igniting properly.
How to Find the Issue
The best approach is to trace the fuel line from the tank to the heater, checking for leaks, damage or loose connections. If needed, replace sections of fuel line one piece at a time until the problem is resolved.