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Observe colored LED indicator on gas control. Status
flash codes are displayed with a three second pause
before repeating. Check and repair the system as
noted in the troubleshooting table below.
Honeywell V2 Gas Control Troubleshooting Chart
Flammable Vapor Ignition Resistant Water Heaters
LED Status
Control Status
Probable Cause
Service Procedure
None (LED not on
or flashing)
Millivolt power is not
present. Light pilot.
Gas valve is functioning
normally. Gas valve is not
powered. Light pilot.
If the pilot will not stay lit
replace pilot assembly. If
problem persists, replace
gas control.
One flash every
four seconds
(LED green)
Not an error. Indicates
pilot is lit and main
burner is off.
The knob can be turned to a
desired setpoint temperature.
Normal operation.
One flash every
second
(LED green)
Not an error. Indicates
main valve is open and
main burner is lit.
None. Control will automatically
shut main burner off when water
temperature reaches the setpoint
temperature.
Normal operation.
Two flashes and
three second
pause (LED
yellow)
Low thermopile voltage;
main valve not turned on.
Check thermopile and its
connections. Check pilot flame.
1. See Service Procedure IV
2. See Service Procedure II
3. See Service Procedure II
Four flashes and
three second
pause (LED red)
Temperature cut-out
limit reached, causing
shutdown.
Check the valves and the water
temperature sensor. Reduce the
water temperature setpoint.
Verify control operation, replace
if exceeding setpoint.
Replace gas control.
Five flashes and
three second
pause (LED red)
Electronics, sensor, or
gas valve fault detected.
Check water temperature sensor
and its connection for open
circuits, shorts, or differences in
resistance between the two
sensor elements.
Replace gas control.
Solid ON
(LED red)
Not an error–indicates
that the control is in OFF
position.
None; wait until LED turns off if
you want to restart system.
LED will go out and the
control will function normally
once the pilot is lit.
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