Espar (Eberspächer) Furnace: “019”
warning RV furnace fault codes
What it means
Glow plug (glow pin) energy too low: the glow plug is not delivering enough heat energy to reliably ignite the fuel, even though its circuit is electrically intact. Often a sign of a worn or aged glow plug.
Most likely causes
- Worn or aged glow plug with degraded heating performance most likely
- High resistance in glow plug wiring or connectors common
- Low supply voltage limiting glow energy less common
Safe checks you can do yourself
- Check battery voltage is healthy (a weak battery reduces glow energy).
- Inspect glow plug wiring and connectors for corrosion or looseness.
- Note whether starts are slow, smoky, or failing, which points to a tired glow plug.
How to reset / clear 019
- Switch off and on to retry a start.
- If the code returns, the glow plug typically needs testing/replacement by an installer.
When to call a technician
If the code recurs after checking voltage and wiring, the glow plug likely needs replacement.
Applies to
Airtronic D2 · Airtronic D4 · Airtronic D4S · Airtronic B4
FAQ
What does Espar (Eberspächer) Furnace code "019" mean?
Glow plug (glow pin) energy too low: the glow plug is not delivering enough heat energy to reliably ignite the fuel, even though its circuit is electrically intact. Often a sign of a worn or aged glow plug.
How do I reset Espar (Eberspächer) Furnace 019?
Switch off and on to retry a start. If the code returns, the glow plug typically needs testing/replacement by an installer.
What is the most common cause of 019 on a Espar (Eberspächer) Furnace?
The most likely cause is worn or aged glow plug with degraded heating performance.
Related · Espar (Eberspächer) furnace
Overheating detected by software: the outlet (heat-exchanger… 017
Overheat shutdown. The temperature measured at the overheat … 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 — Code 19, insufficient glow pin energy for fuel ignition (Le Tonkinois (independent Eberspacher reference))
- Find and clear Espar Airtronic fault codes and Eberspacher Hydronic fault codes — Glow plug issues, P000213 (019) (Heatso)
Note: Newer controllers show P000213.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.