Bradford White EF Series Service Manual page 11

Determine failure mode by observing flashing LED status on ignition module.
* Denotes conditions that may require the heater to be isolated from the vent system to
LED STATUS
Only power light
is on and heater will
not function.
Probable Cause*
Exhaust pressure
switch.
(see page 27)
LED STATUS
Purge light flashing.
Probable Cause*
Exhaust pressure
switch.
(see page 27)
LED STATUS
Valve light flashing.
Probable Cause
Hot surface igniter. Combustion system.
(see page 30)
LED STATUS
Power & flame
light flashing.
Probable Cause
Supply voltage
polarity.
LED status and probable cause shown below.
determine root cause.
Probable Cause
Thermostat circuit. Vent safety switch.
(see page 12)
Probable Cause
Blower. Intake pressure switch.
(see page 25)
Probable Cause*
(see page 18)
Troubleshooting
LED status & probable cause
Probable Cause
(see page 38)
Probable Cause*
(see page 36)
Probable Cause
Flame sensor.
(see page 32)
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