Water heater flashing green light! 4 Easy Troubleshooting Tips

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Is your water heater flashing green light worrying you? Blinking status lights can be confusing, especially if you don’t know what they mean. No worries, this blog’s here for you!

Whether you have an electric water heater flashing green light or a natural gas water heater flashing green light. We need to understand the different water heater light colors and their meanings is key.

We’ll look at the possible reasons behind a flashing green light on your water heater. This includes models like Whirlpool, Defender, Bradford White, and Rheem. We’ll also provide some troubleshooting tips to get your hot water flowing again in no time.

Why is my heater flashing green?

A water heater flashing green light can be a problem for a few reasons:

  1. Uncertain Cause: While a status light on a water heater blinking green indicates on or normal operation, a flashing green light can be confusing. This might not be an error code or a normal indicator.
  2. Potential Malfunction: Flashing lights indicate problems with appliances. If you don’t know what the flashing green light means, it’s hard to tell if your water heater works.
  3. Loss of Hot Water: A broken water heater can leave you with no hot water, making showering and doing dishes stressful.

There’s no guarantee that a flashing green light is a major problem, but it’s important to know what’s causing it.

Troubleshooting Water heater flashing green light

Water heater flashing green light

A water heater flashing green light is confusing, but don’t panic! Here are some steps to troubleshoot the issue:

1. Consult your manual:

The first and most crucial step is to refer to your water heater’s user manual. This manual will explain the specific meaning of the flashing green light for your model. Your best source of accurate information is the manual for different brands and models.

2. Identify the pattern:

Pay close attention to the green light flashing pattern. Is it a single flash, double flash, or continuous sequence? Each pattern has a different meaning.

Solid green light:

Once you turn off the control knob, the light will stay solid green until the pilot light goes out. This might take a while as the thermopile cools down.

Water heater flashing green light:

I have explain a number of flashes and meanings:

  • 0 Flashes: The pilot light is off. Follow the instructions in the manual or manufacturer’s guide to relight the pilot.
  • 1 Flash (every 3 seconds): Normal operation. There’s no gas leak, and the pilot is lit.
  • 2 Flashes: Low thermopile voltage. Make sure your thermopile is clean, your connections are tight, and your wiring isn’t damaged before you replace it. You should replace the thermopile if it’s under 350 millivolts.
  • 4 Flashes: High temperature detected. The gas control valve shuts down the unit when the temperature exceeds its limit. Replace the gas control valve with a technician.
  • 5 Flashes: Temperature sensor failure. Call a technician to replace the gas control valve.
  • 7 Flashes: Gas control valve failure. It’s time to replace the gas control valve.
  • 8 Flashes: Power off failure. There are a few reasons for this, like a slow-cooling element or the pilot still running. After 10 minutes, turn off the pilot and relight. Check the gas control valve with a technician if the problem persists.


Wait 10 minutes before trying again if the light doesn’t blink after a minute. Make sure the thermopile, thermal switch, and connections are working if the pilot stays lit but doesn’t blink.

No flashing green light:

  • If the pilot isn’t lit, follow the manufacturer’s instructions.
  • It’s common for water heaters to get air in the gas line.
  • A faulty thermopile: make sure it’s positioned properly in the flame, and if the problem persists, replace it.
  • Repair any damage to the gas valve wiring.
  • Make sure all the wires are tight.
  • Tripped Thermal Cutoff Switch (TCO): This safety feature cuts power in high temperatures. Ideally, reset it, but address any underlying issues like blocked vents, dirty filters, or not enough air.

3. Check the control panel:

Look for any other indicator lights or error codes displayed on the control panel. These additional clues can help pinpoint the specific issue.

4. Common troubleshooting tips:

Water heater flashing green light
Water heater flashing green light

Electric water heater flashing green light. Here are some troubleshooting tips based on the manual and model:

  • Reset the water heater: There’s usually a reset button on the control panel. You can try holding the button for a few seconds, following the instructions.
  • Check the thermostat: A faulty thermostat could cause the issue. You can adjust the temperature if it’s comfortable for you. But don’t try to fix or replace the thermostat yourself unless you’re qualified and experienced.
  • Inspect the pilot light (gas models only): Ensure the pilot light is lit and burning properly. Follow the instructions on how to relight it if it’s extinguished.

Remember that working with gas appliances can be dangerous. Consult a professional if you’re unsure.

Get professional help. If the troubleshooting steps don’t work, A plumber can diagnose the problem and recommend a suitable repair or replacement.

Read Also: Warning Signs Your Water Heater Temperature Sensor Needs Help (Before It’s Too Late!)

I have a red light on my water heater – what does that mean?

If your water heater has a red light, here’s a quick and easy explanation of what it means:

Blinking Red Light (Once Every 3 Seconds):

There’s good news! Your water heater is working normally. I have lit the pilot light and the gas control valve works properly.

Solid Red Light:

This means your water heater has shut down. You can check out the troubleshooting guide for green lights (previous section) to see what’s going on.

Flashing Red Light (More Than Once Every 3 Seconds):

This indicates a problem. Check out the troubleshooting guide for green lights (previous section).

Here’s a simplified explanation. If you need more details or troubleshooting steps, check out the information from the previous section.

Read Also: Troubleshooting Red Light On Water Heater: Is Your Water Running Cold?

In conclusion, a water heater flashing green light usually means everything’s fine. It is usually just a status indicator or a signal that certain operations are taking place.

However, if you notice any other unusual behavior or the green light keeps flashing, you may want to see a professional. If you want your water heater to last a long time, make sure you follow the manufacturer’s instructions and take care of it regularly.

Read Also: Solar Pool Heaters Vs. Gas Heaters: Which One Is Right For You?

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