My Portable Water Heater Won't Stay Lit

My Portable Water Heater Won't Stay Lit

If your portable tankless water heater is having trouble staying lit, there are a few things to take into consideration while trying to figure out the reason behind it.


  • What is your water source?
    • You must have at least 25 psi (pounds per square inch) to activate and keep the water heater running.
    • If you’re using a pump, there will be fluctuations in the pressure depending on the type of pump you’re using.
    • If you’re using city water with adequate water pressure, then you may need to think of doing a water pressure adjustment or it could be something else.
  • Are you hearing clicking sounds when it tries to light?
    • Yes?
      • Check to be sure the flame sensor is hooked up and for sure connected.
      • Disconnect your incoming water line. There is a screen immediately inside of the incoming water pipe that may have clogged over time and is reducing the water flow and water pressure. (Clean that out if needed)
    • No?
      • You may not have enough water pressure to activate the water heater.
      • Pull the little metal lever on the micro switch to see if you hear clicking (NOTE: Water heater must be in the upright position for this step)
      • If the microswitch doesn’t make the clicking sound when checked manually, it is most likely your ignition pack.

Please be sure you are checking to the following:

  • Fresh batteries (Inserted correctly?)
  • Full propane tank
  • The battery for your pump (if you’re using a pump) is still good

Please keep in mind that the L7 is NOT to be permanently mounted or left unattended as it is not recommended and can be considered a hazard. Not for indoor usage or to be vented. Also, these units are not to be plumbed in to the side or any other part of the house or location and is meant to serve for recreational use only. Using in the manners stated will void your warranty.***

How old is the water heater?

Last thing to consider is the age of the water heater. When was the last time the water heater was flushed and descaled? Over time, sediment can build up inside the pipes of the exchanger and restrict water flow, causing the water heater to overheat and shut off.

If you need more information about flushing your water heater, please visit the links below to learn more or purchase our Eccotemp Descaler Kit and Solution for a more efficient working water heater.


Buy EZ FLUSH in Canada


If you're experiencing issues and need more assistance, please reach out to our technical support team via our LIVE CHAT feature, creating a support ticket, or setting an appointment with us.

To set an appointment CLICK HERE!

To submit a support ticket CLICK HERE! 

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