Water Heater(Red, Green, Blue) Light Blinking/Flashing | PortablePowerGuides (2022)

Have you ever stopped to wonder what the various lights on a water heater mean? If you haven’t, this is as good a time as any to start because those lights are important. They can speak volumes about the health and functionality of your water heater. Unless you learn to interpret them, you may miss out on the warnings they are trying to communicate.

Water Heater Showing A Red Light – Why?

  • A red light shows that the water heater is shutting down. You should respond by moving the gas control valve to the ‘OFF’ position.
  • If the circuit board is damaged and it cannot generate the power the spark igniter needs, the red light will come on and stay on.
  • Many professionals expect a solid red light to signify a problem with the electrical components, which is why they encourage consumers in such situations to check and clean the connectors and contacts.

Water Heater Blinking Red Light – Why?

If the light flashes once every three seconds, it simply indicates that everything is working as expected, that is to say, the pilot light is lit and the gas control valve is functional.

That being said, check the manual that came with their water heater. It should have a chart that explains what the flashing lights mean.

Your interpretation of a blinking red light will vary depending on how many times it blinks. One blink is different from two blinks. Compare the number of flashes to the information in your chart to accurately interpret your status lights.

What Does Flashing Red Light On Water Heater Mean?

It shows that the gas valve is operating normally, especially if the light flashes once every three seconds. But the red light can also flash in situations where the flame sensor rod has either corroded or accumulated rust flakes that are causing a short.

Cleaning the rod with fine sandpaper may solve the problem.

Water Heater Red Light Flashing 7 Times – Why?

A water heater with a red light flashes seven times every three seconds shows that the gas control valve has failed.

You need to replace the gas control valve.

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Water Heater Green Light Meaning

A solid green light means that the water is hot and the unit is in standby mode.

Water Heater Flashing Green Light – Why?

  • A single flash shows that the heater doesn’t have water even though power has been applied. The obvious solution is to fill the unit with water.
  • Two flashes show that the heater is shutting down because of the high water temperature. You have to measure the resistance between the blue and yellow wire connections as well as the resistance between the thermistor plug’s red wires.
  • Three flashes show that the thermistor’s operations have been compromised. In some cases, you can solve this problem by making sure that the thermistor plug is secure and oriented correctly.
  • With four green flashes, you can assume that the upper element has a problem. Five green flashes indicate a similar problem.
  • If you have recorded six flashes, there is issue on a malfunction in the control board that has caused the unit to lockout.

Consult your manual before you panic. The green flashes coming from your unit could have a different meaning.

Water Heater(Red, Green, Blue) Light Blinking/Flashing | PortablePowerGuides (1)

It looks like the LED will flash in the absence of electrical power. One short flash every four seconds shows that the unit is in standby mode.

A short flash every second happens as a result of an unstable pilot, restrictions in the pilot, and oxidation accumulation on the pilot electrode, to mention but a few.

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If the LED flashes twice every three seconds, the damper test circuit has stopped working. In cases where the light flashes four times every three seconds, the tank temperature is too high.

Five flashes are a sign of a false pilot flame. Six flashes and then one flash followed by a 3-second pause signify ‘Failed to light pilot’.

Your unit’s status lights may follow a different scheme from this one.

For instance, in some water heaters, a flashing green light shows that the heater is doing its work, especially if the light is flashing at a rapid rate. On the other hand, slow flashing may signify a situation where the heater is working but there is no request for heat.

Check the manual to get clarification on the meaning behind your heater’s flashing light.

Water Heater Blinking Green Light – Why?

A blinking green light indicates that the water heater is calling for hot water. The blinking light can also signify a faulty end switch on the zone valve.

Depending on the number of flashes, a blinking green light may signify the application of power to a heater that doesn’t have water, high water temperature, malfunctioning thermistors, and defective control boards.

Water Heater Green Light Not On – Why?

The absence of green light could mean any one of several things, including a faulty control board and incorrect supply voltage.

Water Heater Blue Light Flashing – Why?

A flashing blue light on a water heater could mean any of the following depending on your model:

  • A call for heat
  • A draft pressure switch error
  • Blocked diameter vacuum tubing
  • Water in the diameter vacuum tubing
  • Defective pressure switch

Water Heater Flashing Blue Light 3/7/8 Times Meaning

  • Blue Light Flashing 3 Times – This indicates an open draft pressure switch that could be caused by a bad switch, blocked exhaust vent, or a weak fan.
  • Blue Light Flashing 7 Times – Seven flashes means ther is a fault on a flammable vapor sensor.
  • Blue Light Flashing 8 Times – This indicates ‘Flammable Vapor Sensor Out of Specification’. If you recorded eight flashes, three flashes, and then a pause of 3 seconds, the thermostat well and sensor are either damaged or unplugged.

Rheem Water Heater Flashing Light Meaning

Flashing lights on a Rheem heater are typically associated with an open safety switch that has ‘Failed To Close To Sequence’. Though, it may also signify a pilot/control malfunction.

Water Heater Blinking White Light Meaning

Blinking light shows that your unit’s pilot light is out. If the pilot light is out, not only will the water remain cold but you won’t see the flame.

Water Heater Yellow Light Meaning

In a gas water heater, the pilot light should be blue. A yellow pilot light is inadequate. It is not as hot as a blue flame. More importantly, you have to keep relighting it.

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A yellow light is caused by insufficient air. You can solve this problem by cleaning the air intake valve.

Water Heater Orange Light – Meaning

Orange flames are due to dust or dirt. They expect gas burners to generate a blue flame. If the flame is yellow, the air supply is not sufficient.

The orange flame eventually turns blue. Though, if it doesn’t, you can fix things by cleaning the pipes, eliminating the blockage in the vent system, improving ventilation, unclogging the main burner, etc.

Water Heater Blinks 4-5 Times – Why?

‘High-Temperature Shutdown’ is a problem that can cause 4 flashes in a water heater. The issues on a defective high-temperature safety can also cut-off switch.

A wall-mounted water heater will display similar flashes of light whenever hard water mineral deposits fill the heat exchanger.

Water Heater Light Codes

For Honeywell Brand,

1). If the light is not flashing, the pilot is out

2). One flash means that the unit is operating normally

3). Two flashes signify low thermopile voltage

4). Four flashes are a sign of high-temperature shutdown

5). Five flashes indicate a temperature sensor failure

6). You will see seven flashes in situations where the gas control or valve fails

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7). Eight flashes signify a flame sense error.

These codes differ according to different brands.

For instance:

1). One short flash (every four seconds) shows that the unit is in standby mode

2). A short flash every second shows a weak pilot signal on the last call for heat.

3). Three flashes (followed by a three-second pause) indicate a malfunction in the pressure switch

4). Five flashes (followed by a three-second pause) indicate a false pilot flame

5). Eight flashes (followed by four flashes and a three-second pause) reveal a fault in the gas valve.

Again, it is important to consult the manual before you make any decisions. Better yet, call the manufacturer. They will tell you what all the light codes mean.

Water Heater Light Problems and Solutions

Water Heater Light Off- Meaning

If the LED is off, the water heater doesn’t have access to electrical power.

Water Heater Not Blinking – Why?

If the water heater light is not blinking, more than likely, the pilot is out. Other potential causes include a bad thermopile, the presence of air in the gas line, a tripped thermal switch, and loose connections.

But in many cases, you’re looking at a pilot that is not lit.

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How To Fix It?

Water Heater(Red, Green, Blue) Light Blinking/Flashing | PortablePowerGuides (2)

You can relight the pilot by pushing the gas control valve knob in. Hold the knob in place as you click the spark ignite button. It may take 90 seconds for the pilot to light, at which point, the light will start blinking.

Water Heater Light Not ON– Why?

If you have gas and propane water heaters, they use a flame called a pilot light to ignite the burner. If the pilot light has gone out, there are issues with a change in gas pressure, defective thermocouple, a strong draft, and insufficient air.

If you have a conventional electrical heater, the absence of light shows that the heater doesn’t have electrical power.

How To Fix It?

1). If you have an electrical heater, and the light is not on because the unit doesn’t have power, start by checking the circuit breaker. If it tripped, reset it. If the fuse was blown, replace it.

If the circuit breaker is fine, you should consider replacing the electric water heating element.

2). You can respond to a change in gas pressure by relighting the pilot.

3). If the thermocouple is dirty, you can clean it. If it is bent or damaged, ask a technician to repair it. If they can’t, get a new one.

4). If the heater doesn’t have enough combustible air, ask a technician to improve your unit’s ventilation.

Light On Water Heater Won’t Stay Lit – Why?

  • Debris in the pilot tube is restricting the flow of gas
  • The flex tube has a kink
  • Dirt has obstructed the thermocouple
  • The thermocouple is damaged
  • The main control valve is defective

Water Heater Switch Light Always On – Why?

Where propane-powered heaters are concerned, the light might stay on if you’re out of propane. If it is a question of the burner constantly running, you should look for water leaks, worn-out insulation, and an accumulation of sediment at the bottom.

How To Fix It?

If you don’t have propane, get more propane. Otherwise, you should consider hiring a professional to check the wiring. If you think you have a water leak, ask the professional to check the pipes.

They can also use an insulating wrap to fix the insulation. Without proper insulation, the water heater will expend more energy than normal to heat the water.

Don’t forget to ask the technician to check for sediment at the bottom. They have to drain the tank to clean it out.

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Light Flickers On Water Heater – Why?

The lights in your home flicker whenever your heater activates because the unit draws a lot of power. This affects the voltage being transmitted to the rest of your home.

Light On Water Heater Goes Out – Why?

The thermocouple is the most common culprit in such situations. It will either bend or accumulate dust and debris.


What does flashing red light on water heater mean? ›

The red status light will blink once every 3 seconds when the water heater is operating normally. Once the red status light is blinking, release the knob. Set the temperature to the desired setting. We recommend a maximum temperature setting of HOT (120°F) to reduce the risk of scalding.

Should water heater light be blinking? ›

A blinking light on your water heater is an error message. It's also common to see these after you plug it back in when you're opening a shore house for the season. If there's no problem, the blinking light will become steady. If it changes color or keeps going on and off, then there's a problem.

What does green and red light indicate in geyser? ›

Green light that indicates heating is missing. The Geyser is just "superb"...so though it is an instant geyser you need to keep it on for 5 mins before you bath. the geyser has 2 lights green and red. green indicates- Heating process.

What does a two Flash code mean on a water heater? ›

Two flashes every three seconds means the pilot is lit but the gas valve is not detecting enough milivolts being generated by the thermopile.

What does it mean when green light is flashing on hot water heater? ›

If your water heater flashes green 5 times every 3 seconds, you might have a problem with a sensor. Call a technician to replace a gas control valve. Gas control valve failure. If the LED light blinks 7 times every 3 seconds, you have a problem with a gas valve.

How do I reset my water heater? ›

Somewhere on your electric water heater, you'll find a reset button. It's usually red and often located near the thermostat. It may also be hidden behind a removable metal panel on the unit—and then behind some insulation. Once you find the button, push and release it.

How long does it take for a water heater to heat up? ›

The average gas heater takes between 30 and 40 minutes to fully heat up the water in its tank. The average electric heater takes about twice as long as the average gas heater to fully heat up the water in its tank, so you can expect it to take between an hour and an hour and 20 minutes to heat up.

How do I reset my Rheem water heater? ›

First, ensure that the unit is powered on. Next, open the front panel to locate the red reset button near the thermostat. Press it down until it clicks in place. The unit should resume normal operation.

What powers the status light on a gas water heater? ›

This water heater uses a thermopile to generate electricity needed to power the gas control valve. Once the pilot is lit, it may take up to 90 seconds for the thermopile to get hot enough to power the gas control valve. When that happens, the status light will blink once every three seconds indicating normal operation.

How do I know if my gas valve is bad on my water heater? ›

A faulty gas control valve will cause your pilot light to go out or not stay lit after you release the button. It might also cause the water to get too hot, or the heat limiter to trip. Still, this could also point to an issue with the thermocouple, thermostat, pilot light, or other important parts.

How do you reset the gas valve on a water heater? ›

How to reset gas water tank pilot light - YouTube

What does sensor failure mean on a hot water heater? ›

What Does Sensor Failure Mean on a Hot Water Heater? If the thermocouple or the flame sensor fails, then the pilot might not be able to ignite or the burner simply won't stay lit. The error code might also appear if the water temperature in the gas water heater is way too high.

Why is my geyser not heating up? ›

When there's no hot water, the problem can stem from lack of power, a faulty electric thermostat or a faulty upper electric heating element. Start by ruling out power problems. First, reset any tripped circuit breaker, and replace any blown fuse.

How do I know if my geyser is working? ›

Checking for Power

The electric geyser should be on a dedicated two pole circuit in your DB Board. See if it has tripped. No power, no hot water. If the breaker has not tripped you will want to see if you have power at the geyser.

How long does a water heater last? ›

Typically a residential hot water heater lasts between 6 and 13 years.

What does it mean when water heater blinks 7 times? ›

Water Heater - 7 blinks (Gas Control or Valve Failure)

Why do I have no hot water? ›

The lack of hot water is a common problem that can be resolved by looking for loose connections to the water heater and resetting any fuses in the circuit breaker box that may have tripped, causing a lack of hot water. After about an hour, your home will be supplied with warm water again if the breaker tripped.

Why does my Rheem water heater keep beeping? ›

A water heater may sound a beep to warn that there is a water leak. Leaks may be obvious if the floor is wet near the water heater, but the leak might also be somewhere along the line. The beeping may be initiated by a water heater shutoff feature, a flood prevention device. Beeping may also signal a gas leak.

How long does it take water heater to reset? ›

Average Water Heater Recovery Times

60-70 minutes (for a gas tank water heater) 120 minutes (for an electric tank water heater)

Do all hot water heaters have a reset button? ›

Is There a Reset Button on Electric Hot Water Heaters? Yes, all water heaters should have a reset button. They can also be known as the “emergency limit switch”, “emergency cut off (ECO)”, “high-limit safety thermostat switch”, or “electric water heater reset button”.

When should you use the reset button on a hot water heater? ›

Other Reasons for a Hot Water Heater Reset Button to Trip

If the high-limit switch starts malfunctioning and overheating the water, the switch will trip. Wiring is loose. A loose wire in heating element can cause heat that will trip the high-limit switch. You have a short in the heating element.

How do you tell if the pilot light is out on a water heater? ›

The pilot light on most water heaters is located at the base of the unit, below the gas control valve. Open the access panel or door to the burner chamber and look inside. There, you'll find the pilot light tube, which should have a steady blue flame. If you don't see the flame, the pilot light is out.

What does status light mean on water heater? ›

The purpose of the status light is to show the whether or not the water heater is working properly. It will usually indicate 'normal operation', but may indicate something else, especially if you've unexpectedly run out of hot water.

What does it mean when water heater blinks 7 times? ›

Water Heater - 7 blinks (Gas Control or Valve Failure)

How do you reset a flammable vapor sensor? ›

How To Reset Flammable Vapor Sensor on Water Heater - YouTube

Can I relight the pilot light by myself? ›

Relight the pilot light.

Turn the knob to “Pilot,” and let gas to flow to the pilot. Light a lighter or match, then push in the reset button. Hold your flame to the pilot light's opening. Keep the reset switch depressed until the pilot light is burning steadily.

Will water heater leak if pilot light goes out? ›

If the pilot light goes out on a storage or instantaneous hot water heater, space heater or a ducted heater, you will not have a gas leak. This is because all modern gas appliances with pilot lights have a fail-safe device that closes off the gas to the appliance in the case when the pilot may go out.

How do I know if my electric water heater is working? ›

How to Troubleshoot an Electric Water Heater - YouTube

How long does it take for a water heater to heat up? ›

The average gas heater takes between 30 and 40 minutes to fully heat up the water in its tank. The average electric heater takes about twice as long as the average gas heater to fully heat up the water in its tank, so you can expect it to take between an hour and an hour and 20 minutes to heat up.

What powers the status light on a gas water heater? ›

This water heater uses a thermopile to generate electricity needed to power the gas control valve. Once the pilot is lit, it may take up to 90 seconds for the thermopile to get hot enough to power the gas control valve. When that happens, the status light will blink once every three seconds indicating normal operation.

How do you reset a gas hot water heater? ›

The reset button is often red and located near the thermostat or behind a metal panel that is removable on the unit. When you find it, push the reset button and then release it. There may be a lower thermostat button also known as a second reset button.

Where is the reset button on Rheem water heater? ›

Rheem Performance Platinum Reset Button - YouTube

How do you reset a Rheem Honeywell gas valve? ›

Turn the water heater's gas valve switch to the "OFF" position, wait for a few seconds and then flip the switch to the "ON" position to reset the system. The water heater's gas valve is located near the bottom of the unit and connects to your home's natural gas line.

How do I reset my Honeywell hot water heater? ›

Resetting your Honeywell Water Heater is relatively easy once you realize that there is no reset button. Make sure that the pilot is turned on, switch the dial to “very hot” for 10 seconds, to “hot” for 10 seconds and to “pilot” for 10 seconds. This will reset your water heater.

How do you reset the thermal switch on a water heater? ›

How To Reset Your Water Heater - YouTube

Where is the flammable vapor sensor located? ›

Most flammable vapor sensors are located either in the bottom or on the front of the water heaters.

What causes water heater lockout? ›

There are a couple of reasons this may happen: bad water chemistry and possible surging. A clean boiler is a functioning boiler and failure to keep a boiler clean can create this lockout situation. It can even cause permanent damage.


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