Webasto RV furnace fault codes
RV forced-air propane furnaces lock out after failed ignition attempts. Many use a status LED on the control board that flashes a fault pattern.
How to read the code
Find the control board (often behind an exterior access panel or inside under a vent) and watch the status LED. Count the flashes in each group; the pattern maps to a specific fault.
All documented codes
F00 warning
The heater's control unit (ECU) has an internal fault, the heater has been permanently loc… F01 warning
No start - the heater attempted ignition and, even after a repeated start attempt, no flam… F02 warning
Flame abort / flame failure - a flame was established but went out during operation and di… F03 warning
Supply voltage out of range - the heater's operating voltage was either too low or too hig… F04 warning
Premature flame detection - the flame/exhaust temperature monitor sensed a flame before co… F07 warning
Fuel pump fault - the dosing/fuel pump circuit shows an open circuit or short circuit, so … F08 warning
Drive/combustion-air motor fault - the fan motor has an open circuit, short circuit, overl… F09 warning
Glow plug / ignition unit fault - the glow plug (or electronic ignition unit) circuit show… F10 danger
Overheating - the heater exceeded its safe temperature limit and the overheat protection t… F14 warning
On the Air Top EVO 40/55: the blow-out (warm-air outlet) temperature sensor circuit has a …
The heater's control unit (ECU) has an internal fault, the heater has been permanently loc… F01 warning
No start - the heater attempted ignition and, even after a repeated start attempt, no flam… F02 warning
Flame abort / flame failure - a flame was established but went out during operation and di… F03 warning
Supply voltage out of range - the heater's operating voltage was either too low or too hig… F04 warning
Premature flame detection - the flame/exhaust temperature monitor sensed a flame before co… F07 warning
Fuel pump fault - the dosing/fuel pump circuit shows an open circuit or short circuit, so … F08 warning
Drive/combustion-air motor fault - the fan motor has an open circuit, short circuit, overl… F09 warning
Glow plug / ignition unit fault - the glow plug (or electronic ignition unit) circuit show… F10 danger
Overheating - the heater exceeded its safe temperature limit and the overheat protection t… F14 warning
On the Air Top EVO 40/55: the blow-out (warm-air outlet) temperature sensor circuit has a …