Honeywell Hot Water Heater Status Light Blinking [11 Blinks Solved]

Honeywell hot water heater status light blinking at a different number of times defines several malfunctions from the heater element. Status light blinking in red/green only once is a sign of normal operation. 

But if the red/green status light flashes more than once, like 2/4/5/7/8 every 3 seconds, or constantly blinks informing you that there’s something up with your water heater. 

The main errors defined by red/green light blinking are low thermopile voltage, excessive water temperature, temperature sensor failure, gas control failure, power off failure, or extinguished pilot light.

Besides, the Honeywell water heater status light blinking blue 3/6/8 or 8 times points out the stuck open pressure switch, water leakage, flammable vapor sensor error, or the FVS is out of specification.

Throughout the article, we will explore how you will easily clear the error from the heater and back the heater to the normal operation. Stay connected with us till the end.

honeywell hot water heater status light blinking

Read through the comprehensive guide to find a list of diagnostic red/green or blue flash codes of the Honeywell water heater with all well-proven solution methods.

1. Honeywell Water Heater Status Light Blinking Green/Red 1 Time [Normal operation]

The status light flashes once every 3 seconds, indicating the normal operation of the heater. When you notice your Honeywell water heater status light blinking green or red in color once, be sure the pilot is lit and a gas control valve operates normally. Also, if the pilot control knob is set to the pilot position and stays lit, the status light flashes the same.


As this error code means the normal operation of the heater, thus you need to take any significant action here. Just adjust the thermostat to the desired temperature setting. Also, you must have to ensure that the gas control valve is turned to “Hot.”

gas control valve is turned to hot

2. Honeywell Water Heater Status Light Blinking Green/Red 2 Times [Thermopile Voltage Low]

Honeywell water heater status light blinking 2 times means the thermopile voltage is low. The problem starts if the pilot light is on, but the thermopile fails to generate enough millivolts to keep the gas valve open.

Almost all modern water heater controls water temperature through an electronic system that uses circuit boards. This board needs a specific amount of current to get started. Thermopile is an essential equipment of water that produces enough current to power up that small circuit board.

 If the thermopile does not generate the correct voltage, the user will not get hot water. Here the low voltage is the culprit. The voltage reading of a healthy thermopile will be 650 to 850 millivolts or somewhere in between.

But if anyhow, the reading of it is below 400 millivolts, be sure it is defective and needs replacement. The other possible reasons behind its defections are:

  • A weak or broken thermopile
  • Loose or damaged wiring connection at the thermal switch 
  • Accumulated dirt and debris electrical connections 


  • First up, make sure that the thermopile connector is properly connected to the combination gas control valve and at the thermal switch.
  • For this, remove the electrical connectors and check for any accumulated corrosion. Clean out the debris.
  • Also, ensure that the wiring leading from the thermopile to the combination gas control is not damaged, and all should have good electrical contact.
  • Now, before replacing the thermopile, it is a good recommendation to test the thermopile electrically.
  • Use a multi-meter to take a voltage reading. First, set the voltage range to less than one volt or millivolts.
  • Here you need to remove the thermopile wiring connector from the gas control. Then, connect the red positive lead to the red thermopile wire. Besides, connect the black lead of the multi-meter to the white wire.
measuring thermopile voltage - meter
  • Finally, set the gas control to pilot light setting and hold down the gas control’s thermostat knob. Keep holding it until the maximum voltage is reached. 
  • If there are below 450 millivolts, be sure the thermopile is the defect, and you need to change it.
  • Replace the faulty thermopile. 

3. Honeywell Water Heater Status Light Blinking Green/Red 4 Times [Water Temperature Exceeded]

Your Honeywell water heater status light blinks with 4 flash tells you the excessive tank temperature. If the gas control valve has detected high temperatures of the heater, it triggers this error and blinks 4 flashes. Note down the responsive factors behind over temperature shutdown issue of the water heart:

  • Faulty thermostat
  • The clogged pressure relief valve 
  • Loose or damaged wire connections on the circuit board 
  • Bad thermocouple 
  • Faulty gas control valve


  • Check out the thermostat and replace the defective one.
  • Clean out the clogged pressure relief valve
  • Check all the wiring connections and ensure a snug connection between them.
  • Don’t miss the thermocouple. Clean the clogged thermocouple and replace it if needed.
  • Replace the faulty gas control valve
  • There is an easy fix for this problem you need to reset the high temp shutdown on the water heater. Here are the required steps:

How To Reset High-Temperature Shutdown On Water Heater

  • First, turn the temperature control knob to the “OFF” position and wait 5 or 10 minutes.
  • Set the knob to the “PILOT” position.
  • While turning the knob to pilot, press the igniter button quickly and rapidly until you see the 4 flashes at the LED status light.
  • Once you see 4 flashes at the LED status light, turn the temperature control knob to the “VERY HOT” position immediately. Count 10 seconds.
  • Then, set the knob to the “HOT” position for 10 seconds.
  • Finally, turn the temperature control knob to the “PILOT” position and count for 1-10 seconds again.
  • At last, set the knob to your desired temperature level, and you will see the burner come on. 

4. Honeywell Water Heater Status Light Blinking Green/Red 5 Times [Temperature Sensor Failure]

If your Honeywell water heater flashes 5 blinks every 3 seconds, it signifies the temperature sensor failure of the heater. Here either the temperature sensor is covered with sediment or the resistance is out of range. 

Sometimes, for a defective sensor due to mechanical separation between the resistor element and the lead material, the heater triggers this code. Most likely, the problem is not related to the sensor but the gas control valve. The needed troubleshooting steps are included below:


In the case of a faulty gas control valve, you will have to replace the bad valve. Also, you may need to replace the bad temperature sensor. It is a good recommendation to contact a certified plumber to replace the water temperature sensor. 

5. Honeywell Water Heater Status Light Blinking Green/Red 7 Times [Gas Control Or Valve Failure]

7 blinks on the status light of your Honeywell water heater tell you the gas control or valve failure on the unit. The root reasons for this valve failure include: 

  • Malfunctioning the pilot light due to clogged tubes or faulty wiring
  • Stuck dirt particles in the thermocouple
  • Bad thermocouple
  • Clogged burner orifice
  • A defection on the gas valve’s probe
  • Damaged gas valve

Anyway, clearing the 7 blink error is not so tough as long as you will follow the below instructions:


  • Before checking the heating element, you need to reset the gas valve.
  • For this, make sure the pilot light is turned on.
  • Then, rotate the control knob to the “very hot” position and wait for 10 seconds.
  • Turn the pilot light knob to the “hot” position for 10 seconds.
  • After that, set the knob to the “pilot” position for 10 seconds.
resetting honeywell water heater
  • If still there has the same blink, check out the thermocouple.
  • Clean the stuck debris from this element. If needed, replace the bad thermocouple.
  • Make sure that the pilot is lighting. If not, look for debris in the pilot tube, the kink in the hose, poor electrical wiring connection, and faulty pilot button. Fix all of them.
  • Clean out the heater burner and vacuum up the entire combustion chamber.
  • Look at the gas valve probes and measure the resistance reading of the probe. You may need to replace the probe and sensor.
  • Finally, check and replace the faulty gas control valve.

6. Honeywell Water Heater Status Light Blinking Green/Red 8 Times [Power Off Failure]

If the pilot knob is stuck in the “Open” position, the Honeywell water heater status light will blink 8 times every 3 seconds. That means there is power off failure in the unit, but the thermopile still produces millivolts. 

Defective gas control is the leading reason behind this. Also, if you have already shut down the heater but the heating element doesn’t cool down quickly, this issue mostly happens. The issue can occur if the knob is stuck into the off position, but the pilot is running. Follow the below-suggested methods to troubleshoot this error.


  • First, check out the gas control. Replace the defective gas control.
  • Turn the pilot knob to the “Off’ potion. 
  • Wait for about 10 minutes to reset the heater.
  • Relight the pilot after that time.

7. Honeywell Water Heater Status Light Blinking Green/Red Constantly [Pilot Light Gets Extinguished]

When the pilot light gets extinguished, your Honeywell water heater will start blinking red or green light constantly. If the temperature knob is set to the Off position, the thermopile is getting cold down, and the heater will shut down soon.

To fix this issue, you need to relight the pilot. Then, the heater will go back to normal operation. Follow the below instructions in this case:

How To Relight The Pilot Light On The Honeywell Water heater

  • First up, pull out the outer door from your water heater.
  • Then, set the temperature control to its lowest setting or the Off position.
  • Leave the water heater in this position for five minutes. By this, the accumulated gas will easily clear out.
  • Then, rotate the knob and set the thermostat knob to the Pilot position.
  • Hold down the gas control knob all the way in.
  • Keep depressing the piezo igniter button simultaneously until you hear a loud click, and the status indicator light will start blinking.
  • When done, ensure the pilot is lit. If not, repeat the steps.
  • Connect the outer door back into its place and release the knob.
  • Rotate the knob to the ON position and set your desired temperature.

8. Honeywell Water Heater Status Light Blinking Blue 3 Times [An Open Draft Pressure Switch]

Flickering blue light 3 times on your Honeywell water heater indicates there is an open draft pressure switch in the heater. The draft pressure switch is a safety element that is attached to the draft motor through a hose.

The root function of this element is sensing the negative pressure from the draft motor and going to the closed position. By this, the combustion gas will move out. Anyway, the problem starts due to the failure to sense the negative pressure, which causes the switch to be stuck open. The leading reason for this are:

  • Failure of the inducer fan motor
  • Blocked or detached pressure switch hose
  • Low resistance through the pressure switch
  • Broken pressure switch
  • Blocked exhaust vent or air intake
  • Weak inducer fan
  • Clogged condensate drainage system


  • First, make sure the fuel airflow through the furnace vents. Clean out the vents properly.
  • Then, look at the inducer fan and fan assembly.
  • Clean the stuck debris of the fan and also the fan motor.
  • Verify all the screws of the fan assembly are tightened, and there should have a good wiring connection to the control board. Replace the defective fan assembly.
  • Clean the condensate drain and drain valve.
  • Check the pressure switch vacuum tube. Replace the kinked tube.
  • Finally, measure the voltage of the pressure. There should have a 0 to 0.1 reading.
  • If not, replace the faulty pressure switch. 

9. Honeywell Water Heater Status Light Blinking Blue 6 Times [Water Leakage]

If the Honeywell water heater flashes blue light 6 times every three seconds, be there is a water leakage issue in your heater. The main reasons for the water leakage from the heater element are:

  • High water pressure
  • Loosen inlet or outlet connection
  • Sediment collection at water tank bottom
  • Cracked storage tank
  • A deteriorate gasket
  • Long-wearing and tearing
  • Loosen or opened drain valve
  • Faulty temperature and pressure relief valve


  • In the first step, find out from where the water is leaking.
  • Once you have found the leakage source, shut down the heater and gas shut-off valve immediately.
  • If the leaking source is the cold water inlet and hot water outlet pipes, tighten the connection using a wrench.
  • Clean out the sediment build-up from the water tank
  • Check the drain valve. Ensure it is tightened. Replace the defective valve.
  • If the leakage is due to a worn gasket, cracked tank, or faulty pressure relief valve, replace the defective parts with the help of a certified plumber. 

10. Honeywell Water Heater Status Light Blinking Blue 7 Times [Flammable Vapor Sensor Error]

Your Honeywell water heater flickers blue light 7 times if the flammable vapor sensor goes into lockout mode. You just need to reset the FVS lockout to unlock the mode and turn back on the heater function. Here are the needed steps:

How To Reset Flammable Vapor Sensor Lockout In Water Heater

  • Shut down the heater and unplug it from the power connection
  • Wait for 10-20 minutes, and then plug it back again.
  • Now move to the pilot light knob and flip the knob from Low to High. Then flip it from High to Low again. Repeat this step 5-6 times.
  • The status light blocking will be clear from the furnace. If needed, replace the faulty FVS.
flipping pilot light knob from low to high

11. Honeywell Water Heater Status Light Blinking Blue 8 Times [Flammable Vapor Sensor is Out of Specification]

The 8 blue blinks on the Honeywell water heater status light indicate the flammable vapor sensor goes out of specification. This error occurs due to a bad thermostat or flammable sensor. In many cases, a lockout or a reset problem of the water heater leads to 8 blink error.


  • First, reset the FVS lockout mode as the problem may persist by placing gasoline or other flammable gas nearby from the heater.
  • If still there has the same error, you need to measure the voltage reading of the FVS.
  • A healthy FVS will give a reading of 7000 to 25,000 Ohms.
  • If not, replace the faulty FVS, and the blink will be erased.


What should my Honeywell hot water heater temperature be set at?

It is essential to set within a specific range of temperatures for bacterial growth like Legionella and other microorganisms. From the Occupational Safety & Health Administration (OSHA) recommendation, you need to set the heater to at least 140 degrees Fahrenheit or 60 degrees Celsius.

What are the temperature levels on the control valve of the Honeywell hot water heater?

The temperature ranges on the different labels of the heater control valve are: Low= 80-90°, Hot= 120°, A = 130°, B = 140°, C = 150°, and Very Hot = 160°

Wrapping Thoughts

Since we are ending part of the article, we can expect that now you have a crystal clear idea of Honeywell water heater status light codes. Hopefully, you will efficiently break down the code from your heater by following the suggested methods.

But still, if you have questions and queries on any facts, be hurry to let us know through comments. Our expert will reach out to you ASAP.

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