27
TROUBLESHOOTING CHART – HONEYWELL V2.
LED Status
Control Status
Probable Cause
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.
One flash every four
seconds
(LED green)
Not an error. Indicates
pilot is lit and main
burner is off.
You can now turn the know to a
desired setpoint temperature
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.
Two flashes
(LED yellow)
Low thermopile voltage;
main valve not turned
ON.
Check thermopile and its
connections. Check pilot flame.
Four flashes
(LED red)
Temperature cut-out limit
reached.
Check the valves and the water
temperature sensor. Reduce the
water temperature setpoint.
Thoroughly check
out main valve operation and
water temperature control
before walking away.
Five flashes
(LED red)
Water temperature
sensor failure.
Check the valves and the water
temperature sensor. Reduce the
water temperature setpoint.
Thoroughly check
out main valve operation and
water temperature control
before walking away.
Six flashes
(LED red)
Tank leakage detected
by accessory module.
Control recovers after receiving
message from accessory
module.
Solid ON
(LED red)
Not an error-indicates
that the control is in OFF
mode.
None; wait until LED turns off if
you want to restart system.
