Experiencing cold water from hot taps while cold water runs fine indicates that your water heater is failing to heat water or transport it to your fixtures. Common root causes include a tripped electrical breaker on electric models, a faulty upper thermostat, or burned-out elements. On gas units, the pilot light may have blown out, or the thermocouple may be defective, preventing the burner from igniting. Additionally, a broken dip tube inside the tank can allow incoming cold water to bypass the heating zone entirely. Verification: Check the water heater power supply, reset switches, and burner status.
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