EcoSmart Water Heater Won’t Turn On [7 Easy Solutions]

Your EcoSmart water heater won’t turn on due to several reasons. The most likely ones are- no power/incorrect wiring, low water pressure/flow rate, blocked air supply, sediment buildup, ignition failure, system overload, and flame failure. Keep on reading to learn how to solve your Ecosmart water heater problems.

EcoSmart water heater won't turn on

EcoSmart Water Heater Won’t Turn On [7 Easy Solutions]

In this section, we’ll explain in-depth what you can do to solve the causes behind your water heater not functioning properly. 

01. No Power/Incorrect Wiring

Needless to explain, but your water heater won’t run without power. Incorrect wiring can also be why your water heater isn’t working.


Check your power cord and the power outlet to see if they are working okay. If for some reason the circuit breaker has tripped, fix it to get the power running.

In case, there is no reason for the heater to not get power, you should make sure that your heater is wired correctly.

Look at the wiring diagram below for cross-reference. When you’re sure that the wiring is correct but your heater isn’t still working,  the problem has to be something else. 

Wiring Diagram

02. Low Water Pressure/Flow Rate

The activation flow rate of your water heater is roughly 0.3 GPM. Your unit will not activate if your water flow rate is less than this. 

Due to the complexity of residential water systems, there are various possible causes for low hot water pressure.

Hard water buildup, bent water supply intake, broken shutoff valve, cracked or corroded pipes, and malfunctioning pressure regulators are the most probable reasons that can cause low water pressure.


You need to increase the water flow rate to 0.3 GPM. For that, you may need to flush your water heater, check your shut-off valve and replace it if necessary, fix or replace any cracked or corroded pipes in your home, test your pressure regulator to check for damages and replace if needed.

03. Blocked Air Supply

Your exhaust or air supply may become clogged at times, causing your tankless water heater to stop heating.

Many water heaters will switch down automatically to safeguard the device and assist prevent other potential safety hazards.


When an air supply is clogged, it signifies your water heater is having problems with combustion air or venting. Here’s what you need to do-

First, double-check that all vent pipes are correctly attached and free of puncture holes.

Installing your water heater too close to other objects can obstruct the air supply and create a fire hazard, so check your product documentation to make sure the clearance criteria are satisfied. 

Birds’ nests, rodents’ nests, and wasps’ nests can all obstruct your venting, so check all vents that are located or lead outside your home completely.

04. Sediment Buildup

Mineral particles can accumulate in your water heater and other parts of your plumbing system over time. This is especially true if your local water source is “hard” or contains a high mineral concentration. 


Since you have a tankless water heater, it’s very vital to check the water filter, especially if you use well water. For long life, tankless water heaters require additional attention. 

Well water can cause more material to build up in your tankless water heater, making it difficult for water to pass through the lengthy, narrow passage to the heat exchanger. 

If your water filter is not checked regularly, debris might become stuck in this long passage if it is not halted. Flush your water heater every six months to avoid harm. To slow the buildup, utilize a water softener.

05. Ignition Failure

It’s also possible that your house’s lack of hot water is due to an ignition failure. If your water heater displays an error message, it’s a good sign that you might have an ignition problem.

The more common EcoSmart water heater problems are indicated with specific EcoSmart error codes.


This problem is frequently caused by a lack of gas, so make sure your propane tank is full before proceeding. It’s also possible that the ignition will fail if your gas or water valves aren’t fully opened. 

Check and fully open the gas and water valves. If these measures don’t work, it’s possible that your ignition pack has failed or that there’s a more serious issue.

You should contact technical support for assistance in troubleshooting the problem and, if necessary, ordering replacement parts.

06. System Overload

Too many simultaneous hot water applications (such as many showers running) will overload your tankless water heater, depending on its capacity.

If your water heater becomes overloaded, it may struggle to provide enough hot water or shut down completely.


If this happens, you should minimize simultaneous uses to reduce hot water demand, and you may want to try resetting your unit.

However, if your tankless water heater is routinely overloaded, you should consider upgrading to a larger tankless water heater or installing a second unit.

Although a second unit may appear to be an expensive purchase, it will save you money in the long run since you will use less water while waiting for hot water and use less gas to heat the water.

07. Flame Failure

A gas pressure problem or an electrical problem is the most common cause of flame failure. A flame failure can lead to your water heater not starting up.


Similar to ignition failure, simple causes such as a low propane tank or an overdue gas payment should be ruled out first.

A gas line that is too narrow, regulator failure, combustion difficulties, venting, and other factors can all contribute to flame failure. If you need assistance troubleshooting the problem further, contact technical support.


How do I reset my tankless water heater?

You can usually reset a water heater by turning it off and waiting for 5 minutes before turning it back on. To learn more about resetting, you can read our guide on how to reset an EcoSmart tankless water heater.

Does tankless water heater have pilot light?

Most tankless water heaters don’t have a pilot light. They light the gas with electronic ignition.

How do you ignite a tankless gas water heater?

Set the gas shut-off valve to “On” by turning it counterclockwise. To restart the device, reset the electric breaker or turn on the power switch.

How do you put a water heater in pilot mode?

Set the gas knob to “Pilot” and hold it. You’ll push and hold a separate button for pilot mode on some water heaters, usually a red one. Light the pilot while still pushing the gas pedal down.

Does gas turn off when pilot goes out?

Yes, it does turn off. The current stops and the valve closes if the pilot light goes out for whatever reason, preventing any gas from spilling.


Hopefully, you now have a rich understanding of why your EcoSmart water heater won’t turn on. You may need to call in a professional depending on the complexity of your problem.

We recommend you be absolutely sure that you can do it before trying to DIY troubleshoot your heater.Enjoy the warm baths!

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