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How to replace Honeywell Gas control valve

Do not drain water from tank
Honeywell gas control valve      AO Smith gas control valve
How to test gas control

Bradford White has a timer, or setback controller for this gas control valve
Read about Honeywell gas water heater timer
Error code/ troubleshoot/ service manual/ FVIR
Honeywell gas control at Amazon
Honeywell gas control at Amazon
American / Honeywell gas control at Amazon
Honeywell gas valve for propane
Honeywell natural gas valve

Reset gas control to see if it will work:

Rotate dial to OFF, wait 10 minutes for gas to clear.
Then relight.  How to light water heater

Error codes
Steady flash means gas control working correctly, & pilot light ON
8 flashes and 3 flashes means replace gas control

This type gas control valve is powered by thermopile. Water heater does not have thermocouple. Thermopile is basically several thermocouples together. The result is more current, which is used to power small circuit board inside gas control valve. Result is error codes and status monitoring capability.
Honeywell gas valve

Selling features of Honeywell gas control

Gas control valve features explained
See vodeo about Honeywell gas control
Bradford white high recovery
Do not drain water from tank

This gas control is used on atmospheric vented water heaters

Not used on power-vented models
Found on many water heaters today. AO Smith/ Bradford White etc.

Adjust temp on Honeywell gas valve
Icon gas control valve error codes
How to light water heater
How to light water heater/ pdf
How to light Whirlpool energy smart
Bradford White Service manual

More Bradford White service manuals

How to test & replace Honeywell gas control valve
Icon gas valve error codes
Full service manual
Bradford White and FVIR
Honeywell gas control label    WV8840 QV code
This QV code on side of Gas Control gave no results when scanned by iphone app
QR codes are scanned by phone
QR codes usually go to a website, or better identification of part, or to seller
How to make QR codes for your business or product or advertising

Identify gas control numbers

Order gas valve replacement

Located on side of gas control valve
This natural gas valve was taken from AO Smith water heater 2012
Order replacement gas control valve from manufacturer, online etc.

Buy natural gas
Honeywell gas control at Amazon
American / Honeywell gas control at Amazon
Honeywell natural gas valve
Reliance NG at Amazon
Buy: Propane/ LP
Reliance LP at Amazon

Honeywell gas valve for propane
 Bradford White gas water heater   Turn off gas valve
Turn Gas valve OFF

Turn gas OFF

Rotate handle perpendicular across gas line.
Do not drain water from tank
Honeywell gas control valve Black pipe union
Black pipe union
1/2" Black pipe Union. Use 2 wrenches
Keep pipe clean
Honeywell gas control valve Yellow flexible gas line
Protect end of pipe from dirt
Remove old teflon tape.
Keep all debris from inside of pipe.

Remove gas line from gas control valve

1) Do not let pipe ends get dirty.
Remove old teflon tape, and keep debris out of pipe.
Loose debris can travel into new gas control valve and cause malfunction.

2) Note how tight gas line is connected to gas control.
Gas pipes are not overtightened into gas control valve.
Use two wrenches to take apart union. Then disconnect from gas control.

3) Gas water heater with large BTU consumption: Use black pipe instead of yellow flexible gas line.
Back of yellow flex package has BTU size chart.
Water heater BTUs shows on label located on side of tank

Honeywell gas control valve
Larger image
Move knob to OFF
1) Pull out plug with red and white wires located on front of gas control
2) Piezo Igniter wire comes apart
3) Unscrew manifold tube
4) Unscrew pilot tube
5) Notice how tight each thread is
6) Pilot tube: reverse thread for propane
7) Remove phillips head screw that holds front cover.

Honeywell gas control piezo igniter Disconnect piezo igniter wire
WV8840 Gas control valve
Larger image
Temperature sensor, igniter and gas control can be replaced without draining tank.

Do not drain water from tank

Take apart gas control valve

Backplate remains installed.

How to replace Honeywell gas control.
1) Remove 1 phillips head screw to left of pilot tube that holds cover (shown in image above).
3) Remove plastic gas control cover. Tip plastic cover out from bottom, and then pull straight back toward you and cover snaps off. Caution: plastic cover is connected to body with 3-strand yellow-orange-white wire.
4) Disconnect yellow-orange-white wire that connects to temperature sensor. Wire is plugged into circuit board on plastic cover. Grasp wire and pull upward to unplug wire from circuit board..
Honeywell gas control
Larger image

Honeywell gas control with front cover removed

2 clips hold valve body to backplate
Backplate stays attached to water heater
Honeywell gas control valve

Clip holds Valve Body to Backplate

5) Remove valve body from backplate.
Some models have 1 screw. Other models have 2 plastic clips that hold valve body to backplate. These are located at bottom on right and left side. Use screwdriver to push 1 clip down while while using another screwdriver to pry valve body outward. Then use screwdriver to push down other clip to release valve body.

Replace valve body and other non-functioning parts

Honeywell gas control valve

Reassemble gas control

Push cover straight onto backplate.
Snap two top pieces into backplate
Put screw into bottom
  Yellow flexible gas line

Reconnect gas line using yellow teflon

Apply yellow teflon tape, and leave first two threads clean with no tape.
Do not let dirt, stray teflon, or any debris enter gas line. Make sure gas line is clean.
NO tape teflon on pilot tube or manifold tube

Reconnect tubes and wires

NO tape teflon on pilot tube or manifold tube
Do not overtighten gas line to gas control valve, or it can damage valve
Pilot tube and manifold tube are not overtightened
Test Honeywell gas control for leaks

Smell for gas leak

Natural gas is lighter than air, and gas smell will rise
Propane gas is heavier than air, and gas smell will fall to floor

Turn Gas ON

Test for gas leak

Apply soapy water to each gas connection
a) Test gas line or flexible pipe: Mix liquid soap with water and use brush to put around around gas line joints to see if there are bubbles. Use plenty of soapy water.

Wait: It will take time for bubbles to appear since gas is under low pressure.
Soap bubbles coming from joint indicate leak: retighten pipes, use teflon tape on yellow flex pipe and black pipe.
Do not overtighten pipes or damage can occur to gas control valve.

b) Test factory-installed connections located below gas control valve
Manifold and pilot tube connections located under the gas control valve do NOT use teflon tape.
See image of manifold and pilot tubes
If either tube under gas control valve is leaking, then tighten a little bit. Do not overtighten.
Manifold and pilot tube: look for reverse thread on LP water heater. Regular thread on NG water heater
Remember: Natural gas and propane gas both have less pressure on the line than water pipes, so gas pipes are easy to seal with ordinary wrench. If you can install water line without leaking, you can do the same with gas line. Do not over-tighten connections.
WV8840 Gas Valve
See larger

Light water heater:

Rotate dial to OFF, wait 10 minutes for gas to clear.
Then light heater.  How to light water heater
Honeywell Icon gas control valve is found on Bradford White, AO Smith and Rheem water heaters
Honeywell makes HVAC controls
Icon gas valve Bradford White ICON gas valve

Honeywell gas valve
Honeywell Gas valve video
Knob and igniter are black instead of red on some gas controls
Honeywell WV8840 circuit board
Larger image
COM port/ communication port connects on  RX TX GND located at bottom of image
GND is ground, other two contacts are unknown

WV8840 communication port

Image shows front and back of circuit board flipped in photoshop so front and back can be laid over top of the other.

I cannot find a spec sheet showing model numbers, or differences between models.
I do not know electronics and therefore cannot dissect the circuit board inside the gas valve.

Circuit board is powered by current generated by heating thermistor. E1 and E2 in lower right corner connect to thermistor.
Bradford White Service manual
Gas water heater timer

Bradford White gas water heater timer is powered by 24Volt transformer.

Image shows Bradford White gas water heater timer:
     1. Programmable Setback Controller (gas water heater timer)
     2. Integrated Mixing Device installed
How to save hot water using mixing valve
Buy from my affiliate links:
Mixing valve kit at Amazon
Water heater mixing valves at Amazon
     3. Motorized Inlet Shut-off Valve (in event of leak)

The Bradford White gas water heater timer connects to COM port on Honeywell gas control valve thermostat. Timer is for specific models only.

I do not know how the 24volts interfaces with the RX TX GRD communication terminals on the gas control valve thermostat
Read more about the gas water heater timer
Icon gas valve
Adjust temp on Honeywell gas valve
Icon gas control valve error codes
To reset gas control, rotate dial to OFF, wait 10 minutes for gas to clear. Then relight.
How to light water heater
How to light water heater/ pdf
How to light Whirlpool energy smart
Bradford White Service manual

More Bradford White service manuals
How to rerplace gas control valves
How to test gas control valve
How to light Honeywell gas control

Service manual (10Mb)
Service manual 2
This gas control used for power vent models
Replace this gas control using short length of pipe as illustrated below
Honeywell makes 2nd style gas control
Honeywell gas valve error codes
Adjust temperature/ error codes on Rheem Honeywell
How to light this type of gas valve:
Slide on-off switch to OFF position.
Go to blower system located on top of water heater and turn blower switch to OFF.
Turn off all electric power to water heater appliance.
Set Red knob, the valve thermostat, to LOW.
Wait 5 minutes to clear out gas.
Check for the smell of gas that would indicate a leak.
Turn on electric power to water heater
Set blower to ON position.
Slide on-off switch to ON position.
Set Red knob thermostat to desired temperature.

Read more
Remove gas valve
How to replace gas control
Replace gas control
Troubleshoot gas control valves

Troubleshoot gas water heater

Troubleshoot FVIR system

How to light water heater

Additional links

How to install tank-type gas water heater
How to troubleshoot Rheem tankless

How to troubleshoot Bosch tankless

Troubleshoot electric water heater

Troubleshoot gas water heater
Do it yourself
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Maintain efficiency

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