Austin's Best Plumbing How to Unlock a Navien Tankless Water Heater

How to Unlock a Navien Tankless Water Heater?


Two months ago I replaced my storage tank-type water heater and bought a Navien tankless heater. After installation, I tried to increase the temperature of the heater but failed as it was being locked.

Austin's Best Plumbing How to Unlock a Navien Tankless Water Heater

After that, I was searching for the answer to the question of how to unlock a Navien tankless water heater. Here I illustrated how to unlock a Navien tankless water heater step by step. 

Why a Navien Tankless Heater Got Unlock?

Pressing lock and other keys unintentionally are reasons for being locked off a Navien tankless heater. Say for example DIP Switch 7 on mode “LOCK” the temperature settings from being changed.

Navien’s some models have LIME ALARM feature. This feature will remind users to flush the heaters in 6, 12, or 24 months. As we know, for getting smooth performance flushing the system is a must. So, it’s a worthwhile feature.

Now, If you want to use the feature, you have to do some work. For setting a 6-month alarm, one has to flip dip switch 7. The problem is Dip switch 7 is also responsible for navien temperature LOCK.

How To Unlock a Navien Tankless Water Heater?

You can follow two methods to unlock a Navien tankless heater.

First Method:

Austin's Best Plumbing How to Unlock a Navien Tankless Water Heater

Just press the remote lock button of the control panel for three seconds.

Second Method:

Before learning about the second method, you should know about DIP switches.

DIP Switches

For better performance and functionality of a tankless heater, proper control on that machine is mandatory. DIP switches control the functionality of a tankless heater.

There are two switches location in a Navien tankless water:

  • Main Circuit Board (PIB)
  • Front Panel

Main circuit board (PIB) switches

In the circuit board of a Navien tankless heater, there are two sets of DIP switches. These switches are for the configuration of the heaters model settings.

Austin's Best Plumbing How to Unlock a Navien Tankless Water Heater

Note: Some of these configurations are set by Navien production factory. You shouldn’t change those factory set configures.

Front Panel DIP Switches

This DIP switches configure a lot of things like:

Austin's Best Plumbing How to Unlock a Navien Tankless Water Heater
  • The heater pump and recirculation
  • Display
  • Well pump
  • Storage tank and solar system
  • Lime alarm
  • High altitudes
  • Cascade venting and guess typesetting

Unlock Step By Step

First Method:

In this method, you need to press a button on the front Panel remote controller. Flip the button for three seconds. Hopefully, your Navien tankless heater would be unlocked.

Second Method

Step 1:

Uncover the front shed of your heater.

Step 2:

Find the main circuit board DIP switches.

Step 3:

Flip off DIP switch 7.

Austin's Best Plumbing How to Unlock a Navien Tankless Water Heater

All done.


Now, as the Naiven tankless water is in an unlocked position. You can check whether the heater function properly. Turn on a sink. Feel the water temperature you set and flow rate. You know Naiven tankless heaters have minimum flow rate of 0.5 GPM (gallon per minute).

By placing your hand under the tap water, you can feel the flow rate. If you find the temperature and flow rate are, as usual, that means everything is fine. On the other hand, if you notice the water flow rate or temperature is not up to set, you have to check the heater.


For any type of issue with your tankless water heater, you should first flow water heater manual properly.

People also asked.

Q. How Do I Turn Up The Temperature On My Navien Tankless Heater?

Ans: You can control the temperature of your navien tankless heater by using a dip switch on the main PCB board.

Q. How to reset navien tankless water heater


Ans: To turn on or off you need to press reset button. After pressing the button typically, temperature appears on the front panel. Sometimes there might be an error message on the panel. To solve that you have to reset your tankless heater. To reset just press the reset button.

Q. How much does it cost to install a Navien tankless water heater?

Ans: A Navieb water heater installation cost may vary depends on various factors. The cost fluctuate between $575 to $1,500.

Q. How Long Do Navien Tankless Water Heaters Last?

Ans: According to most of the tankless heaters last for above 20 years. Tough Navien offers 15 years warranty, proper maintenance, and care last tankless heater for two decades.

Q. Do I Need To Flush My Tankless Water Heater?

Ans: Overtime, Calcium, and other mineral accumulate into the heating chamber of tankless heater. This problem occurs seriously if your locality has hard water. For efficient performance and expected hot water, you have to flush the tankless heater once a year. Tank manufacturers suggest the same. 

Q. How Does Navien Recirculation Work?


Ans: To activate recirculation mode you have to set DIP switches on the front panel as well as set the position of the two-way valve inside the Navien tankless water heater. Then recirculation pump and gas burner begins to work to provide hot water into the supply line. As the hot water flows through the supply loop, you get hot water in no time. Navien Recirculation technology saves time and water as well. As result, you don’t have to wait for hot water.

Q. How do you turn on a Navien boiler

austin's best plumbing. How to Unlock a Navien Tankless Water Heater

Ans: To turn on a Navien boiler you have to press the power button. You have to do the same to turn off the unit also. When the power is on, the temperature of the space heating will present on the front panel of the unit. 

Q. How much does a Navien tankless water heater cost

Ans: Navien tankless water heater cost vary as per model and features of specific unit. Typically, a Navien tankless water would cost between $1,075-$1,535.


Hope you will be able to get the answer to how to unlock a Navien tankless water heater and solve the issue. If you are unable to handle the issue, just contact Austin’s best plumbing company plumberson. We offer free consultation to handle the problem.

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