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 mostly an operational behavior.

Steps to check:

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

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