Bradford-White Corp Commerical 24 Volt Flue Damper series Water Heater, D38T155 Troubleshooting

TROUBLESHOOTING

CAUTION

Use Caution Not to Damage Connectors when making Voltage Measurements or Jumping Terminals

Verify Primary and secondary voltage	1	DANGER
		120 volt exposure. Use Caution
at the transformer
(see photo 1)		To Avoid Personal Injury.

		Rear terminals
			primary
										Ignition Module LED Status
			(120 VAC)
If LED on ignition module is flashing,									OFF = No power to module
									ON = Module has power
reset water heater by turning “OFF”
									Flashing = Module is in lock-out
power. Wait 5 seconds and turn
power back “ON”				Forward terminals
				secondary		Ignition module
				(24 VAC)
Rotate thermostat dial to the						See thermostat testing
highest setting.
						(page 6).
				Remove damper from			N
Does damper vane Move to the full		N		heater and		Does LED light on		Y		Check for debris limiting
				Jump black & yellow wires		ignition module				damper rotation, if no
open position?
				of heater harness		illuminate?				debris, replace damper
	Y			(see photo 2)
				Is there 24 VAC between	Y	Replace ignition module				1A
Does LED light on ignition module		N		terminals “TR” & “TH” of the
illuminate?				ignition module?		Check damper harness
				(see photo 1A)		connection.
	Y				N
		N		See pilot will not light
Is there pilot flame?
				(page 8)
	Y						Check for 24 VAC
							across terminals
							“TR” & “TH”

Does Main burner operate?		N	See pilot lights, no flame
			signal.
			(page 9)
	Y
			See main burner
Does burner continue until thermostat		N
			short cycle
set point is reached?
			(page 11).
	Y
			Check for debris limiting
Does flue damper rotate to the closed		N
			damper rotation, if no
position?
			debris, replace damper
	Y

System okay.

Page 5

Damper vane show in open position. If damper

is closed, disconnect from harness and REMOVE damper from water heater.

2

Harness shown disconnected from damper with BLACK and YELLOW wires jumped.

5