Inconsistent water temperatures across your home's hot water fixtures can stem from several common technical issues. Primary causes include exceeding the unit's maximum Gallons Per Minute (GPM) flow capacity, fluctuating water pressure from municipal lines, a failing flow control valve, or heavy mineral scale accumulation on the heat exchanger coils. When hard water scale insulates the heat exchanger, the electronic control board struggles to calculate accurate thermal transfer rates. Verification: Descale the heat exchanger with a vinegar flush and check simultaneous fixture usage.
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