Richmond tankless water heater does not start when a single low-flow fixture is opened, but works with multiple fixtures.

Safety first: Standard hot water precautions apply.

• Clean inlet filter: Remove and clean the cold water inlet screen to maximize flow.
• Service flow sensor: Clean or replace the flow sensor if it is sticking or scaled.
• Increase fixture flow: Use less restrictive aerators or showerheads to increase flow rate.
• Consider unit sizing: If the heater is significantly oversized for very small loads, consult a professional about system design changes.