Water is warm but not reaching the set temperature; Noritz unit runs continuously without error codes.

Safety first: Gas pressure and line sizing must be checked by a licensed professional.

Steps to check and correct:

• Verify temperature setting: Check the Noritz remote controller or front panel to ensure the set temperature is high enough (e.g., 120–125°F for typical use).
• Check for mixing valves: If a thermostatic mixing valve is installed near the heater, ensure it is not set too low or malfunctioning.
• Descale heat exchanger: Perform a descaling flush if the unit has not been serviced recently, especially in hard water areas.
• Professional gas check: Have a technician verify gas line sizing and measure inlet and manifold pressure while the unit is running at maximum fire.