Solutions to Common Noritz Tankless Water Heater Problems

Solutions to Common Noritz Tankless Water Heater Problems

Tankless water heaters are one of the greatest innovations in the field of plumbing. Unlike a traditional water heater that heats water in a tank, their water supply is referred to as water on-demand. Not only will they not run out of hot water, they are also more economical to operate.

As with any of your major home appliances, regular maintenance is always recommended to both maintain optimal performance and to extend its lifespan. At Tankless Done Right, our team of certified plumbers specifically trained in all aspects of tankless water heaters can easily handle any of your plumbing needs.

If you own a Noritz tankless system, it will show a few different error codes if something needs attention. While it may still operate with codes showing, any error codes should be investigated immediately by a certified plumber knowledgeable in all aspects of tankless repair to avoid an even more costly Noritz tankless water heater repair later. Here are some common error codes that you may see on your Noritz monitor:

  • Code 29
  • Code 16
  • Code 11
  • Code 12
  • Code 73
  • Code F76
  • Code 90

Common Problems and Solutions

Noritz build high-quality tankless gas water heaters. However, despite of that, you may still run into some heating issues. But don’t worry, any problems can be diagnosed and repaired by a professional and trained plumber.

Sometimes, the remedy to some issues could be simply to ensure that the filter is clean or check the thermostat.

Some of the common problems encountered by consumers are:

  • No hot water is coming out. When you encounter this, the first few things you have to make sure are: if the tap is fully opened,  if there are any obstructions in its pipe, and if water pipes are frozen.

If you don’t see any error codes, the simple remedy could be just to open the shut-off valves. If this does not help at all, then it’s time to call an expert.


  • Water is too hot. Make sure that you set the temperature right. Also, check if the temperature sensor is not broken.


Sediment build up is potential issue as well. Cleaning the fixtures and flushing or descaling could be necessary.


  • Water is not hot enough. – You might be surprised to know that some users just fail to set the temperature correctly.


Sometimes, sediments are also to be blamed. So, flushing and descaling procedure are recommended. If you are unsure on how to do it, better entrust it to a professional who is experienced with Noritz tankless water heaters.


  • Water heater is too noisy. You’d surely be alarm if you hear a loud vibrating noise. The culprit could sometimes be the debris, which can be treated by flushing.


However, if that is not the case, check if there are leaks in the sealed combustion or if there is unstable burner flames.

Tankless Done Right, a division of Scott Harrison Plumbing, has taken their 25-plus years of plumbing experience and applied it exclusively to every aspect of tankless water heater systems.

If you are in need of a Noritz tankless water heater repair service, give us a call today and let us show you how we have earned our reputation of providing prompt, reliable service with straight-forward, honest communication.