What could be a consequence of a customer resetting the primary control multiple times before service arrives?

Resetting the primary control multiple times can result in too much oil being pumped into the combustion chamber. This occurs because, when the primary control is reset after a shutdown, it may attempt to restart the burner and push additional oil into the system. If the burner does not ignite successfully after being reset, unburned oil can accumulate in the combustion chamber.

In a typical operation, the control will only allow a specific amount of oil to be pumped at a time. However, repeated resets might lead to an improper ratio of oil to air, resulting in excess fuel in the combustion chamber that could cause rich conditions, leading to safety risks and potential damage to the burner.

Understanding this process is crucial for HVAC professionals, as it underscores the importance of diagnosing the root cause of the burner shutdown rather than continuously resetting it.