What causes a tankless water heater to stop working?

Because tankless units only heat water as it’s needed, running too many hot water appliances at the same time could mean the unit just can’t keep up. On the other hand, your “no hot water” problem could be cause by a bigger issue such as: Plugged heat exchanger (due to hard water) A blocked vent/air intake.

What is the code for a Noritz tankless water heater?

NORITZ NRC663-FSV TANKLESS WATER HEATER MANUAL Model (EZTR40) [PDF] (2014) sold by Home Depot & other suppliers. A reader opined that for some models this code means Noritz manifold replacement is needed. See Error Code 59 as well – above on this page. On 2021-01-31 by (mod) – Noritz 57 error code ?

What causes a code 16 on a Noritz tank?

A sharp spike in outlet water temperature will cause a code 16. This often results from scale buildup, which hampers heat-transfer efficiency and makes the unit try to compensate by burning hotter. Since this error can be caused by scale buildup or hard water, performing a descaling procedure or using a water softener may resolve it.

What does the Noritz error code 29 mean?

Noritz Error Code 29 This code indicates a problem with condensate drainage. In condensing tankless water heaters, a special drain line equipped with a neutralizer (to reduce the acidity of the outflow) removes the condensate.

What causes a Noritz tankless burner to flood?

A blockage in the condensate drain line or incorrect condensate drain piping would cause the burner to flood if not for this error code. Call your licensed contractor, and he or she will check to make sure the condensate drain line is properly routed and unobstructed.

NORITZ NRC663-FSV TANKLESS WATER HEATER MANUAL Model (EZTR40) [PDF] (2014) sold by Home Depot & other suppliers. A reader opined that for some models this code means Noritz manifold replacement is needed. See Error Code 59 as well – above on this page. On 2021-01-31 by (mod) – Noritz 57 error code ?

A sharp spike in outlet water temperature will cause a code 16. This often results from scale buildup, which hampers heat-transfer efficiency and makes the unit try to compensate by burning hotter. Since this error can be caused by scale buildup or hard water, performing a descaling procedure or using a water softener may resolve it.

Noritz Error Code 29 This code indicates a problem with condensate drainage. In condensing tankless water heaters, a special drain line equipped with a neutralizer (to reduce the acidity of the outflow) removes the condensate.

What does it mean when heat exchanger fails on Noritz tankless?

Check that the flame rod/sensor is not covered by debris. Clean or replace if necessary. What it Means: The thermal fuse has failed. How to Fix: Replace the thermal fuse. Confirm that the unit has no airflow restrictions and gas has proper combustion. Check water quality as hard water or sediment can cause the heat exchanger to get clogged.