Water heating intermittently between hot and cold cycles is frequently caused by unstable water pressure, fluctuating flow rates, or a failing flow sensor. If your plumbing system experiences pressure drops, the tankless unit's internal flow switch struggles to maintain a consistent signal, causing the electronic control board to cycle the gas burners on and off. Furthermore, low-flow fixtures can cause the unit to hover right around the minimum activation threshold. Verification: Check household water pressure regulators and test temperature stability at a single fixture.
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