F07

Webasto Furnace: “F07”

warning RV furnace fault codes

Safety The fuel pump moves diesel or petrol - inspect with the system off and avoid sparks, especially on petrol units where vapor is flammable. Do not apply voltage directly to the pump to test it; Webasto explicitly prohibits direct component operation.

What it means

Fuel pump fault - the dosing/fuel pump circuit shows an open circuit or short circuit, so the heater cannot meter fuel reliably.

Most likely causes

Open circuit (break) in fuel pump wiring or connector common
Short circuit in the fuel pump or its wiring common
Failed fuel pump (metering pump) itself less common

Safe checks you can do yourself

Visually inspect the fuel pump wiring and connector for damage, corrosion, or chafing.
Check that the pump connector is fully seated.

How to reset / clear F07

Repair the wiring fault if found, then switch the heater off and on.
Clear any lock-out with the fuse-pull procedure if the heater stays locked.

When to call a technician

If wiring is intact but the fault remains, the fuel pump should be tested and replaced by a technician.

Applies to

Air Top EVO 40 · Air Top EVO 40 B (petrol) · Air Top EVO 40 D (diesel) · Air Top EVO 55 · Air Top 2000 STC

FAQ

What does Webasto Furnace code "F07" mean?

Fuel pump fault - the dosing/fuel pump circuit shows an open circuit or short circuit, so the heater cannot meter fuel reliably.

How do I reset Webasto Furnace F07?

Repair the wiring fault if found, then switch the heater off and on. Clear any lock-out with the fuse-pull procedure if the heater stays locked.

What is the most common cause of F07 on a Webasto Furnace?

The most likely cause is open circuit (break) in fuel pump wiring or connector.

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Sources

Air Top Evo 40 / Air Top Evo 55 - Fault Codes / Troubleshooting (Fig. 503) — Section 5.4, Fault code F 07 (PC codes 88 open / 08 short) (Butlertechnik / Webasto)
Webasto Air Top 2000 STC Fault Error Codes — Section 5.5, F07 Fuel pump interruption (hex 08/88) (Butlertechnik / Webasto)

Note: On the 2000 STC, fuel-pump short (hex 08) and interruption (hex 88) are also logged separately; the FXX label is 'Fuel pump interruption'.

● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.