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How to replace Honeywell Gas control valve
Do not drain water from tank for atmospheric gas valve removal
Icon gas valve
For atmospheric vent models, do not empty water heater, valve body can be replaced while tank is full of water
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Honeywell gas control at Amazon
American / Honeywell gas control at Amazon
Honeywell gas valve for propane
Honeywell natural gas valve
Reliance NG at Amazon
Reliance LP at Amazon
Kenmore water heater gas valve
Replacement .pdf
How to test & replace Honeywell gas control valve

Resources:
Adjust temp on Honeywell gas valve
Error codes
Error codes
To reset gas control, rotate dial to OFF, wait 10 minutes for gas to clear. Then relight.
State/ AO Smith: Error codes/ service manual
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Error light blinking 4 times
How to light water heater
How to light water heater/ pdf
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How to test gas control valve
How to light Honeywell gas control

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This Honeywell gas thermostat is NOT removed from tank ... instructions on separate page

Replacement instructions on separate page
How to replace Honeywell power vent water heater gas valve

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Example Honeywell gas control valve at Amazon
Reliance NG at Amazon

Resources:
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Bradford White power vent service manual
Range 90
Hot is 120 F // Very Hot 156
ECO limit 199 F
How to light Honeywell gas valve
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Error codes2
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Service manual
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Test gas control/ from BW service manual
Sequence of operation
How to clean burner
Honeywell gas control valve     AO Smith gas control valve Reset gas control to see if it will work:
Rotate dial to OFF, wait 10 minutes for gas to clear.
Then relight.  

This type gas control valve is powered by thermopile. Water heater does not have thermocouple. Thermopile is basically several thermocouples together. The thermopile produces enough current to power small circuit board inside gas control valve that monitors status and issues error codes.
How to light water heater
How to test gas control
Check warranty status
Gas control valve and other parts are covered for full length of warranty period.
Labor is covered first year of warranty.

Model number and serial number are located on label on side of water heater.
Serial number contains code for year of manufacturer. Find age of water heater
Contact manufacturer.
Honeywell gas control label Identify gas control numbers to buy replacement
Order gas valve replacement
Located on side of gas control valve
WV8840B1042
WV8840
This natural gas valve was taken from AO Smith water heater 2012

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

4) Keep gas connections clean



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 on atmospheric type
Loosen screw fromt front of gas control
Take apart gas control valve
Backplate remains installed.

How to remove 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 Replace valve body and other non-functioning parts
Then 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.
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:
Instructions printed on face f gas control to right of knob
Rotate knob to OFF, wait 10 minutes for gas to clear.
Rotate knob to Pilot
Press in and hold knob in Pilot position
Press piezo igniter button until pilot lights
You should hear click sound, keep holding down knob
Release knob when status LED blinks

Larger image of instructions
How to light water heater
Icon gas valve Adjust temp
All water heater temperatures are approximate
Calibration of temperature should be within 10-15 of temperatures shown on chart

Use mixing valve when temperature setting is above 135
Risk of scalding when temperatures exceed 120
Typical bath-shower is 110

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Water heater mixing valves at Amazon

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Advantages mixing valve
gas water heater timer Add gas water heater timer
Automatically rotates temperature knob to reduce gas consumption

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Enter coupon code: GENO to save $5

Resource:
Read about gas water heater timer
Honeywell WV8840 circuit board
Larger image
Mirror image of gas control valve electronics/  Image shows front and back of circuit board flipped in photoshop so front and back can be laid over top of the other.
Bradford White ICON gas valve
Spec sheet showing model numbers, or differences between models is unavailable.
The circuit board is probably customized by Honeywell for each application specified by water heater manufacturer.
Circuit board is powered by current generated by heating thermistor. E1 and E2 in lower right corner connect to thermistor.
Bradford White Service manual

WV8840 communication port, or COM port
The COM port or communications port is available to water heater manufacturer for connecting a 'future' product.
In 2018,  there is no method to utilize this port for DIY innovation.
Bradford White uses the COM port to connect their 'setback controller' ... the design has gone through changes, and the application is unclear.
Read about BW setback controller

Service manual (10Mb)
Service manual 2
This gas control used for power vent models
Honeywell makes 2nd style gas control for power-vent models
Reset 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 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.
How to ligh power vent honeywell gas valve

Honeywell gas valve error codes
Adjust temperature/ error codes on Rheem Honeywell
How to light this type of gas valve:
Remove gas valve Honeywell gas control valve for Power vent models
Troubleshoot resources at top of page
... is removed when replacing.
How to replace gas valve thermostat
Troubleshoot power vent water heater
 


Troubleshoot gas water heater/ all gas valves

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