Unit cycles on and off rapidly when a small amount of hot water is used (e.g., handwashing).

Safety first: None beyond normal; this is primarily an operational behavior.

Steps to check:

• Increase flow slightly: Open the hot water tap further to maintain a steady flow above the unit's minimum.
• Adjust mixing: Reduce cold water mixing at the faucet and lower the heater's set temperature to allow for greater hot water flow.
• Clean inlet filter and flow sensor: Ensure accurate flow detection by cleaning the inlet filter and having the flow sensor inspected.

When to call a professional: If cycling is severe, a technician can verify flow sensor operation and discuss system modifications (e.g., a small buffer tank).