Bradford White ECO-DEFENDER EURG2DV40S N Series Service Manual page 8

UDV Series
Observe colored LED indicator on
electronic 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.
LED Status
None (LED no
Millivolt power is not
on or flashing) present. Light pilot.
One flash every
four seconds Not an error. Indicates pilot
is lit and main burner is off.
(LED green)
One flash every
Not an error. Indicates main
second valve is open and main
burner is lit.
(LED green)
Two flashes
Low thermopile voltage;
(LED yellow)
main valve not turned ON.
Four flashes
Temperature cut-out limit
(LED red)
reached.
Five flashes
Water temperature sensor
(LED red)
failure.
Six flashes
Tank leakage detected by
(LED red) accessory module.
Solid ON
Not an error-indicates that
(LED red) the control is in OFF mode.
8
8
Control Status
Gas valve is functioning
normally. Gas valve is not
powered. Light pilot.
You can now turn the know to a
desired setpoint temperature
None. Control will automatically
shut main burner off when
water temperature reaches the
setpoint temperature.
Check thermopile and its
connections. Check pilot flame.
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.
Check water temperature
sensor and its connection for
open circuits, shorts, or
differences in resistance
between the two sensor
elements.
Control recovers after receiving
message from accessory
module.
None; wait until LED turns off if
you want to restart system.
Troubleshooting V2
Probable Cause
Service Procedure
If the pilot will not stay lit
replace pilot assembly. If
problem persists, replace
gas control.
Normal operation.
Normal operation.
1. See service procedure
IV.
2. See service procedure II.
3. See service procedure II.
Replace gas control
Replace gas control
4. Check T&P valve.
5. Check all water fittings.
6. Pressurize and leak test
tank.
LED will go out and the
control will function
normally the pilot is lit.