Confirmed Issue:

When operating the Espar furnace, it starts making a loud ticking or thumping sound. The Espar is still heating and otherwise operating properly.

Affected Units:

Any Vandoit van with an Espar system

Issue Explanation:

The Espar is operating properly. A loud ticking or thumping noise during operation is normal; it is the sound of the Espar dosing fuel pump cycling and the frequency of the sound increases as the fuel pump cycles faster.  The sound tends to be most noticeable during the first five minutes of operation.  Vans with the B4 model tend to be somewhat louder than those with the B4L model.

Resolution:

It is likely no resolution is needed, but you may want to inspect the fuel pump mount to ensure the rubber isolator is tight and the pump is not touching any of the van's framing.