Air heaters like those from Eberspacher and Webasto are trusted for keeping cabins warm in vans, boats, and trucks - even in harsh conditions. But even the most reliable systems can fail for unexpected reasons. In this case, a full-time vanlife couple ran into error code P000223

Air heaters like those from Eberspacher and Webasto are trusted for keeping cabins warm in vans, boats, and trucks - even in harsh conditions. But even the most reliable systems can fail for unexpected reasons. In this case, a full-time vanlife couple ran into error code P000223, and the surprising culprit was their furry travel companion.

A customer reached out after their Espar heater fan began making noise and shutting off after a few hours of use. They relied on the heater to stay warm overnight and had to restart it manually several times. The system eventually showed a diagnostic fault: P000223.

According to Espar repair manuals, error code P000223 - indicates a blower motor blockage. This usually means the fan impeller is jammed, dirty, or running sluggishly. The recommended steps include:

• Checking for visible blockages or debris
• Manually turning the fan to confirm smooth operation
• Inspecting the Espar blower motor and mounting position

We requested installation pictures from the customer, and everything appeared properly mounted. However, the noise suggested a partial jam - possibly caused by using excessive force when mounting the heater against its base, which may have pushed the casing into the fan. This can happen to both - Eberspacher / Espar and Webasto fan.

This is a common mistake. When too much pressure is applied during installation, the blower motor components can become misaligned or restricted, leading to noise, resistance, and error codes like P000223. For S3 models, using the appropriate tools, the tightening torque should be 6 ± 1 Nm (approximately 53 ± 9 in-lb).

After more discussion, the customers mentioned they were living full-time in a van with their dog. This detail changed everything.

We advised them to remove the upper plastic cover of the heater and inspect the fan area. What they found: a build-up of dog fur tangled in the fan impeller, partially jamming the motor and triggering the fault code.

Once the pet hair was cleared from the fan blades and the casing was reinstalled, the heater returned to full functionality. No more noise. No more shutdowns. No more Eberspacher error code alerts.

While this case involved an Espar AS3 B2L, the same issue can occur in many models, including:

• Espar / Eberspächer: Airtronic D2L, D4L, B4L, D4R, AS3 D2L, AS3 B2L, AM3 D4L, D4R, B4L
• Webasto: air heater like Air Top 2000 S STC, EVO 40, EVO 55

If it has a fan, it's vulnerable.

If you're traveling long-term with pets, especially in a compact space like a van:

• Inspect your Espar heater fan monthly for hair or debris
• Avoid using too much force on the heater casing during install
• Check for error codes like P000223 if the heater shuts off early

Contact support if the Espar blower motor spins freely but the code persists.

Whether you're using an Espar, Webasto, or other diesel air heater, our team can help you troubleshoot fault codes like P000223 - fast.