Noritz Error Code 16: Abnormally high outlet temperature (Tankless)
Noritz error code 16 on a tankless water heater means: Abnormally high outlet temperature. It is also called Noritz diagnostic code 16.
Homeowner? What Noritz code 16 means for you
Call a technician Your tankless water heater is reporting: Abnormally high outlet temperature. The tankless water heater has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
Safe things you can check yourself
- Check that gas reaches the house: other gas appliances work, or the propane tank is not empty.
- Make sure the heater is plugged in and its breaker is on. In winter, keep the power on: it protects the unit from freezing.
- Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
- Check that the hot and cold water valves under the heater are fully open.
- If you have a remote controller, turn it off and on once. If the code comes back, call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Noritz error code 16 mean?
The outlet water got hotter than allowed. Same meaning on all families. Most common cause is scale in the heat exchanger and water parts; wrong gas type is also listed for premix units.
Applies to: All Noritz residential tankless (EZ, NRCR, NCC199CDV, NRC/NRCP)
Common causes of Noritz code 16
- Hard water scale built up in the heat exchanger, water control parts, or both
- Wrong gas type (premix units)
- Clogged inlet filter screen reducing flow
Noritz models that use code 16
EZ71DVEZ98DVEZ111DVN-0841MCN-0841MC-DVN-0842MCN-0842MC-DVNCC199CDVNRC111-DVNRC111-SVNRCR92DVNRCR111DV
Other Noritz Tankless codes
All Noritz Tankless Water Heater error codes →
Noritz code 16: homeowner questions
What does Noritz code 16 mean?
Abnormally high outlet temperature. The outlet water got hotter than allowed. Same meaning on all families. Most common cause is scale in the heat exchanger and water parts; wrong gas type is also listed for premix units.
Is it safe to keep using my tankless water heater with code 16?
It depends on the cause. The tankless water heater has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
Can I reset Noritz code 16 myself?
You can try one reset (power off for 30 seconds, then on). If Noritz code 16 comes back, the cause is still there and a licensed technician should check it.
Who can fix Noritz code 16 near me?
Aurora Star Tech Inc. repairs Noritz tankless water heaters in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Tankless Water Heater No Hot Water: What to Check
Troubleshooting guides
- No hot water All brands · Tankless Water Heater
- Water temperature fluctuates All brands · Tankless Water Heater
- Cleaning ignition and flame rods - Noritz Noritz · Tankless Water Heater
- Cleaning the fan and burner - Noritz EZ/NRCR/CDV Noritz · Tankless Water Heater
- Descaling (flushing) the heat exchanger - Noritz Noritz · Tankless Water Heater
- Draining to prevent freezing - Noritz EZ/NRCR Noritz · Tankless Water Heater
- Field gas conversion NG to LP - Noritz NRCR/EZ Pro Noritz · Tankless Water Heater
- Heat exchanger replacement - Noritz NRC111 / NCC199 Noritz · Tankless Water Heater
- Heater does not fire when hot water is opened - Noritz tankless Noritz · Tankless Water Heater
- Recirculation not working or hot water slow - Noritz NRCR Noritz · Tankless Water Heater
- Water not hot enough or temperature fluctuates - Noritz tankless Noritz · Tankless Water Heater
Source: Noritz EZ/NRCR/CDV Level 2 Maintenance & Troubleshooting (Premix R2 V2), 16 & 20 error codes, p.14; Noritz Residential Level 2 Maintenance & Troubleshooting (NRC/NRCP and older, R2 V1), Descaling/flushing and 14, 16, 20 error codes, p.3, 8; Noritz NRCR Pro training (NRCR92/NRCR111, Printable V3), Poor water quality issues, p.32. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.