Assuming you don t have a power vented unit a 7 flash means the gas control valve has failed and needs to be replaced.
Honeywell water heater gas control valve reset.
If you have a power vented unit a 7 flash is a flammable vapor sensor error.
You may have to replace the sensor but first you can try a reset by turning the unit off at the switch on the gas valve wait a minute then turn the switch back on.
Keep track of which front is which.
If your water heater does not begin working or another lock out condition occurs have a competent hot water heating specialist diagnose the system and make repairs.
Had to fix a water heater that had the honeywell 5 blinks of death error code.
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.
Repeat these steps with the new gas valve.
8 reset gas valve this will only appear after the gas valve has been shutoff and continues to produce a current to the thermopile.
How to fix gas valve or control panel on gas hot water heater honeywell gas valve wv8840b1110 repair and replacement.
Reverse the above steps to mount the new front onto the old back that s still hooked to the water heater.
Slide the ribbon of wires out of the clip on the housing and the front of the gas valve is free.