Why does my Noritz always hot keep turning off can be due to several reasons, including scale buildup, low gas pressure, venting issues, flow rate issues, or error codes, with Noritz tankless water heater safety features shutting off to protect unit. Noritz tankless water heater, Japanese brand, has safety sensors that shut off if issues detected, with common reasons for turning off including scale buildup in heat exchanger causing overheating, with hard water causing mineral deposits, triggering high limit switch, requiring flushing with vinegar for 45 to 60 minutes. Second, low gas pressure or gas supply interruption, with Noritz needing sufficient gas pressure, if gas line undersized or other appliances using gas, unit shuts off, check gas pressure. Third, venting blockage or improper venting, with Noritz requiring proper venting, if vent blocked by birds nest or ice, unit shuts off for safety, check vent. Fourth, low water flow rate, if flow rate below minimum 0.5 GPM, Noritz shuts off, check filter and water pressure. Fifth, error codes like 11 ignition failure, 12 flame failure, 14 high limit, 16 overheating, 90 combustion abnormal, check display for error code. Sixth, dirty air filter or inlet filter clogged. Solution includes flushing yearly, cleaning inlet filter, checking gas, checking vent, checking error code in manual, with if error persists call plumber or Noritz support at 1-866-766-7489. So Noritz turning off due to scale, gas, vent, flow, or error code.
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