Intermittent hot water; Lochinvar heater cycles on and off rapidly, causing temperature swings at fixtures.

Safety: Turn off power before adjusting internal controls. Water may be hot; use caution at fixtures.

Steps:

• 1. Check flow rate: Ensure fixtures are drawing enough water to meet the heater's minimum flow requirement. Very low flow can cause cycling.
• 2. Inspect recirculation setup: Verify that the recirc return is piped to the correct connection per Lochinvar diagrams and that check valves are installed to prevent backflow.
• 3. Test flow sensor: Clean or replace the flow sensor if it is sticking or giving erratic signals.
• 4. Adjust control settings: On models with adjustable differential or anti-short-cycle settings, widen the temperature differential slightly to reduce rapid cycling (follow the installation manual).