Espar (Eberspächer) 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
012 warning
Overheating detected by software: the outlet (heat-exchanger) temperature exceeded the sof… 017 danger
Overheat shutdown. The temperature measured at the overheat sensor has exceeded the maximu… 019 warning
Glow plug (glow pin) energy too low: the glow plug is not delivering enough heat energy to… 020 / 021 / 022 warning
Glow plug electrical fault: 020 = open circuit / interruption (broken plug or disconnected… 047 / 048 warning
Metering (fuel dosing) pump fault: 047 = short circuit / overload on the pump output, 048 … 050 warning
Operating lockout: too many unsuccessful start attempts. After repeated failed starts (the… 052 warning
Unsuccessful start (no flame established). The heater attempted to start but did not reach… 053 / 054 / 055 / 056 warning
Flame-out (flame cut-out) during operation: a stable flame was established but then lost d…
Overheating detected by software: the outlet (heat-exchanger) temperature exceeded the sof… 017 danger
Overheat shutdown. The temperature measured at the overheat sensor has exceeded the maximu… 019 warning
Glow plug (glow pin) energy too low: the glow plug is not delivering enough heat energy to… 020 / 021 / 022 warning
Glow plug electrical fault: 020 = open circuit / interruption (broken plug or disconnected… 047 / 048 warning
Metering (fuel dosing) pump fault: 047 = short circuit / overload on the pump output, 048 … 050 warning
Operating lockout: too many unsuccessful start attempts. After repeated failed starts (the… 052 warning
Unsuccessful start (no flame established). The heater attempted to start but did not reach… 053 / 054 / 055 / 056 warning
Flame-out (flame cut-out) during operation: a stable flame was established but then lost d…