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Bradford White gas water heater timer
Gas water heater timer requires 3 things:
1. The "ICON gas valve"/ Honeywell gas control valve
2. 24-volt AC "Accessory Module that powers available features.
3. The Programmable Setback Controller which is a 4-time-per-day, 7-day a week gas water heater timer
Back to 10 things for troubleshooting water heater
Icon gas valve
For atmospheric vent models
Range Low 55° - very hot 160°
Average bath 110°F, typical water heater temp 120°
ECO limit 199° F, ECO trips, gas valve fails
TP release water at 210°
All calibrations are approximate
Severe scalding risk over 135°
To reset gas control, rotate dial to OFF, wait 10 minutes for gas to clear. Then relight.
Buy
Reliance/ Honeywell gas control
American / Honeywell gas control
Kenmore water heater gas valve
Craftmaster/ Whirlpool
Bradford White
AO Smith

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
Gas water heater timer fits this valve
Replacement instructions
How to test & replace Honeywell/ pdf
WT8840 replacement manual
How to replace Honeywell gas control valve

Resources WV8840/ WT8840:
Typical installation manual
Typical installation manual/ low NOx
Adjust temp on Honeywell gas valve
Error codes WV8840 series
Error codes WV8840 series
Error codes WT8840
AO Smith service handbook
Service handbook
State Error code/ troubleshoot/ service manual/ FVIR
Bradford White service manual
Error light blinking 4 times
How to light water heater
How to light water heater/ pdf
How to light Whirlpool energy smart

WT8840 product overview models
WT8840 gas valve manual and troubleshoot

How to replace gas control valves
How to test gas control valve

How to install gas water heater

For power vent and flue dampered models
Range Low 90° - very hot 160°
Average bath 110°F, typical water heater temp 120°
ECO limit 199°F, ECO trips, gas valve fails
Average bath 110°F
ECO limit 199°F
TP release water  at 210°
Buy
Example Honeywell gas control valve at Amazon
Reliance NG at Amazon
Replacement instructions
How to replace water heater gas valve

Resources:
Flue dampered service manual/ atmospheric
Flue dampered/general install and troubleshoot
Dampered troubleshoot codes
Dampered error codes
Dampered error codes
Induced draft troubleshoot codes
Example dampered install manual2

Example power vent install manual
Example power vent install manual
Example power direct vent install manual
Adjust temperature/ error codes on Honeywell
How to light Honeywell gas valve
Error codes and troubleshoot chart
Error codes
Error codes
Icon gas valve error codes

AO Smith service handbook
Bradford White power vent service manual 1
Bradford White power-vent service manual 2
Bradford power-direct-vent service manual
Condensing power vent service manual
Test gas control/ from BW service manual
Sequence of operation
How to clean burner

Safety
Water heater safety precautions
Water heater precautions/ pdf
Gas-water-heater-Safety-Precautions
Gas valve safety
Thermal expansion
Insulation blanket

For power vent models
Range Low 80° to Hot 150°
Error C flashes at 160°
Buy
Buy Intellivent gas control at Amazon
White Rodgers/ Rheem Intellivent gas control
AO Smith intellivent
AO Smith Intellivent at Amazon
AO Smith White Rodgers at Amazon

Replacement instructions
How to replace water heater gas valve

Resources:
How to light water heater
Typical installation manual
Sample installation manual
Example install manual
Ultra low nox power vent manual
Error codes and adjust temp on Intelli-vent
AO Smith Intellivent troubleshoot and FV test
Troubleshoot Intellivent/ pdf
FVIR intellivent troubleshoot .pdf
Intellivent service manual TC-048 R6
Sequence of operation and service brief
Intellivent wiring
Power direct vent troubleshoot
Status codes and troubleshoot/ condensing
How to reset intellivent
For resetting controller:
Method A... After the unit has been off for at least a minute, plug it in, turn on switch; within a few seconds, depress both arrow buttons on controller, and hold them until the left light begins to blink.  Release them, and within a few seconds, push those arrow buttons in the following sequence:  L/R/L/L/R/L/R/R.  This should reset the controller.
Method B... after FV event on AO Smith
1. Turn off power to water heater for 10 seconds.
2. Restore power to water heater.
3. Within 10 seconds of restoring power, press the two temperature adjust buttons simultaneously until the left (green) “Vacation” LED begins to blink (approx. 5 second delay). Once the Vacation LED begins to blink, release both buttons.
4. Again, within 10 seconds, press both temperature adjust buttons simultaneously until
Vacation LED is on steady (approx. 5 second delay).
5. Release two buttons, the  microcomputer will clear the FVS lock-out and normal
operation will then be restored.
Gas water heater timer Discontinued?
Interface with the Honeywell gas control valve

This Bradford White setback controller/ no longer available
Gas water heater timer Current product
Current Bradford White product:

Programmable setback controller/ for commercial gas water heater timer
7-day programmable timer 2-on-off per week/ works with Bradford White Honeywell gas control valve
Temperature control
Diagnostic codes
programmable setback control

Resources:
Control system sell sheet
Manual
Manual
Programmable gas water heater manual
Bradford White ICON gas valve
Larger image
ICON gas valve/ Honeywell gas control valve
Resources:
Error codes
Error codes/ troubleshooting
To reset gas control, rotate dial to OFF, wait 10 minutes for gas to clear. Then relight.
State/ AO Smith: Error codes/ service manual
Bradford White: Error code, service manuals

Troubleshoot gas control valves
Icon gas control error codes
Full service manual
Honeywell power vent gas valve error codes
Power vent service manual
Bradford White and FVIR
Honeywell gas control
Larger image
Honeywell and White Rodgers and all other Electronic controls are powered by a thermopile instead of thermocouple.

Thermopile produces more current than thermocouple, enabling use of circuit board that controls the gas supply and manifold supply electromagnets inside gas control valve, and records status and error events.

The thermopile is located inside combustion chamber next to pilot light. Heat from pilot flame creates current in thermopile. Two wires, red and white, carry current from thermopile, that must pass through a thermal cut off (TCO) locted on front of combustion chamber before plugging into front of gas control valve where they connect to circuit board.

The thermostat on back of gas control is a variable resistor with maximum cut off (ECO) at 180°F that inteprets temperature change as resistance. When temperature drops below thermostat set point, the circuit board activates the manifold electromagnet, releasing gas to burner.
Troubleshoot etc
How to replace water heater gas valve
How to light gas water heater
Resources:
Icon gas valve
Resources:
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
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
Icon gas valve Temperature settings
Residential range 55-160°, ECO trip at 180°
Commercial range 75-180°, ECO trip at 200°
Light honeywll gas valve

Resources:
How to light water heater
How to light water heater/ pdf
WV8840 Gas Valve
See larger
Icon gas valve overview
Resources:
How to test and replace gas control valve
Step-by-step how to replace honeywell gas control valve
WV8840 Gas control valveLarger image
Disassemble Icon gas control

Temperature sensor, igniter and gas control can be replaced without draining tank.
Backplate remains installed.
How to replace honeywell gas control valve

How to replace Honeywell gas control.
1) Unplug wires and disconnect piezo igniter
2) Remove 1 screw. On front bottom below plastic cover is 1 screw located on left side.
3) Remove platic 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. Wire is plugged into circuit board on plastic cover. Grasp wire and pull upward to unplug wire from circuit board..
5) Remove valve body from backplate. There are 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.

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.

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

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.
April 2020:
Years ago, Bradford white had a setback controller that interfaced with the COM port  It was powered by 24 V transformer .... meaning that the com port is NOT powered by the thermopile that powers the circuit board and gas water heater operation.
The setback controller was able to disable gas valve until a setpoint was reached ... so I assume all it did was turn off circuit to gas valve until thermostat probe signaled that a lower temperature was reached. It’s too bad that folks did not buy the discontinued setback controller so today's com port mystery could be solved. Other than that information, some guy sent me a pdf that makes no sense to me
honeywell-gas-control-communication-port.pdf
honeywell gas control valve circuit board
Larger image
Second example of circuit board shows numerous differences between the two boards. Basic layout appears the same, but the circuit board has different type of connection points for relays
Honeywell WV8840 circuit boardLarger image

Inside Honeywell gas control valve showing 2 solenoids that are activated by the circuit board. The circuit board fits down over top of  two pins that stick up. The circuit board receives power from thermopile which produces small current when heated by pilot light. The circuit board uses the current to intepret input from thermostat, ECO, and temperature knob to control supply of gas to water heater, and issue LED status codes.
Every circuit needs at least 2 wires ... the solenoids cannot be wired in series for the same reason light bulbs are not wired in series ... because of voltage drop.
So the gas valve body must be the return wire, just like a car body is the return wire for battery.

On the other side of solenoids is a ruber diaphram.
Without knowing more,  my guess is that the gas sits on inside two chambers formed by the rubber membrane ...
... and the solenoids push against the rubber membrane to open and close gas supply to pilot tube and manifold tube...  There are two springs that sit against the rubber diaphram. I'm guessing the springs probably keep the rubber in place.

The gas probably passes through orifices to get into the pilot and manifold chambers .... and the orifices are probably customized to fit different types of gas and pressures...

This shows the need to keep end of gas supply line clean when installing ... and keep teflon tape or sealant at least 1 thread away from end of pipe to ensure nothing gets inside the gas control valve.... also shows why the sediment trap on gas line is needed, and why air and water in the gas line can cause problems, and why low gas pressure can cause pilot to fail.

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9 ways to save with water heater

Service manual (10Mb)
Service manual 2
This Honeywell gas valve if different than the Honeywell WV and WT series shown above.
The WV WT series are used only for atmospheric heaters, and the gas valve is powered by small current produced by thermopile.

The Honeywell gas control valve shown to left does not have a COM port among other differences with the WV and WT series gas valves discussed above ... instead this valve is used on Blower assisted water heaters ... such as Power Vent and Flue dampered heaters. The heater operation and gas valve are powered by plugging water heater into 120 volt outlet, and the heater does not have a thermopile like atmospheric heaters do.

There are various models ... powered by 24V AC transformer or 120V depending on heater and brand of heater ... for example Bradford flue damper has 120V with resettable ECO, while AO Smith and Rheem have 24 volt.
Range 90-160°, combustion chamber TCO trips at 188°, ECO trips at 188°
Resource:
How to troubleshoot power vent
Review AO Smith Flue Damper series

White Rodgers Intellivent
White Rodgers Intellivent is used on power vent models
Range 80-150°, Error flashes if water temperature reaches 160°, ECO trips 180°

Resources:
More gas control valves
Troubleshoot power vent water heater
Resources:
Troubleshoot gas control valves / service manuals/ error codes replacement steps
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Icon gas valve

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