If the pressure switch on a 35 gpm electric pump is malfunctioning, what is the first corrective step after de-energizing the unit?

Cleaning the contacts is a practical first step when addressing a malfunctioning pressure switch. Over time, contacts can accumulate dirt, corrosion, or other residues that can hinder their performance. Cleaning them can restore proper connection and functionality, often resolving the issue without the need for more extensive measures.

By starting with this remediation approach, one not only monitors the condition of the existing components—potentially saving on replacement costs—but also ensures that the pump system is assessed with minimal disruption. If cleaning doesn't rectify the issue, then further actions, such as replacing contacts or the switch, can be considered.