Bradford-White Corp Commerical 24 Volt Flue Damper series Water Heater, D38T155 TROUBLESHOOTING, 120 volt exposure. Use Caution To Avoid Personal Injury.

TROUBLESHOOTING
If LEDon i gnition module is flashing,
reset water heater by turning “OFF”
power. Wait 5 seconds and turn
power back “ON”
Rotatethermostat dial to the
highest setting.
Does dampervane Move to the full
open position?
Does LED light on ignition module
illuminate?
Isth ere pilot flame?
Does Main burner operate?
Does burner continue until thermo stat
set point is reached?
Does flue damper rotate to the closed
position?
System okay.
Y
Y
Y
Y
Y
Y
N
N
N
N
N
N
Remove damper from
heater and
Jump black &yellowwires
ofheaterharness
(see photo 2)
Does LED light on
ignition module
illuminate?
Checkfo r debris limiting
damper rotation, ifno
debris, replace damper
Y
N
Seepilot will not light
(page 8)
See pilot lights, no flame
signal.
(page 9)
See main burner
short cycle
(page 11).
Verify Primary and secondary volta ge
at the transformer
(see photo 1)
Ignition ModuleLED Status
OFF = No power to module
ON= Modu le has power
Flashing = Module is in lock-out
CAUTION
Use Caution Not to Damage Connectors when makingVoltage Measurements or Jumping Terminals
Isth ere 24 VAC between
terminals“TR” & “TH” of the
ignition module?
(see photo 1A)
Check for debrislimiting
damper rotation, if no
debris, replace damper
2
Damper vane show in open position. I f damper
is closed, disconnect from harness and
REMOVE damper from water heater.
Harness shown disconnected from d amper
withBL ACK and YELLOW wires jumped .
See thermostat testing
(page 6).
DANGER
120 volt exposure. Use Caution
To Avoid Personal Injury.
1
Rear terminals
primary
(120 VAC)
Forward terminals
secondary
(24 VAC) Ignition module
Page 5
1A
N
YReplace ignition module
Check damper harness
connection.
Checkf or 24 VAC
across terminals
“TR” &“TH”
5