Weil-McLain water heater cycles on and off frequently with short run times, even with steady hot water demand.

Safety first: Turn off power before adjusting internal controls.

• Check temperature differential: Review the boiler or water heater control settings for differential (on/off spread). Increasing the differential slightly can reduce short cycling.
• Verify sensor placement: Ensure tank or supply sensors are properly located and secured, not directly in the hottest spot where they see rapid swings.
• Inspect flow: Confirm that circulators and valves allow adequate flow through the heat exchanger to prevent rapid temperature spikes.
• Consult a professional: If the appliance is significantly oversized for the load, a technician may recommend control strategy changes or system modifications.