Espar (Eberspächer) Furnace: “017”

danger RV furnace fault codes

Safety Overheating is a genuine fire risk. Never operate the heater with blocked air paths and never bypass the overheat sensor. These are sealed-combustion diesel/petrol heaters; if you smell exhaust fumes inside the cabin, shut the heater down immediately and ventilate, as combustion gases contain carbon monoxide which is colourless, odourless and deadly.

What it means

Overheat shutdown. The temperature measured at the overheat sensor has exceeded the maximum hardware threshold (roughly 150 C / above what the sensor can safely read). The control unit shuts the heater down to prevent damage and fire, and may lock out after repeated events.

Most likely causes

Blocked or restricted hot-air outlet / ducting causing heat to back up into the unit most likely
Blocked or restricted hot-air intake (recirculation air) starving the blower common
Faulty or out-of-spec overheat/outlet temperature sensor less common
Failed blower motor reducing airflow over the heat exchanger less common

Safe checks you can do yourself

With the heater off and cool, confirm nothing is covering or blocking the warm-air outlet grille and the air intake.
Check that hot-air ducting is not crushed, kinked, or excessively long/restricted.
Make sure any closable outlet vents are open so air can flow freely.
Let the unit fully cool, then restart and watch whether it overheats again.

How to reset / clear 017

Allow the heater to cool completely.
Turn the heater off, then on again at the controller.
If the unit is locked out after repeated overheats, the lockout must be cleared with a diagnostic tool (e.g. EasyStart Pro / digi-diagnostic) by an installer.

When to call a technician

If the heater overheats again after airflow is confirmed clear, if it has locked out, or if the overheat sensor is suspected faulty.

Applies to

Airtronic D2 · Airtronic D4 · Airtronic D4S · Airtronic B4

FAQ

What does Espar (Eberspächer) Furnace code "017" mean?

How do I reset Espar (Eberspächer) Furnace 017?

Allow the heater to cool completely. Turn the heater off, then on again at the controller. If the unit is locked out after repeated overheats, the lockout must be cleared with a diagnostic tool (e.g. EasyStart Pro / digi-diagnostic) by an installer.

What is the most common cause of 017 on a Espar (Eberspächer) Furnace?

The most likely cause is blocked or restricted hot-air outlet / ducting causing heat to back up into the unit.

Related · Espar (Eberspächer) furnace

012
Overheating detected by software: the outlet (heat-exchanger… 019
Glow plug (glow pin) energy too low: the glow plug is not de… 020 / 021 / 022
Glow plug electrical fault: 020 = open circuit / interruptio… 047 / 048
Metering (fuel dosing) pump fault: 047 = short circuit / ove… 050
Operating lockout: too many unsuccessful start attempts. Aft… 052
Unsuccessful start (no flame established). The heater attemp…

Sources

Eberspacher Airtronic Fault Codes — Airtronic fault code list, code 017 (Le Tonkinois (independent Eberspacher reference))
Find and clear Espar Airtronic fault codes and Eberspacher Hydronic fault codes — Overheating detection, P000116 (017) (Heatso)

Note: On newer EasyStart/CAN controllers this appears as P000116. Threshold value is approximate and varies by firmware.

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