Led Status & Probable Cause - Bradford White EF100T150(E)*(N Service Manual

Determine failure mode by observing flashing LED status on ignition module.
* Denotes conditions that may require the water heater to be isolated from the vent
LED STATUS
Only power light
is on and water heater
will not function.
Probable Cause*
Exhaust pressure
switch. (see "Exhaust
Pressure Switch
Testing and
Replacement")
LED STATUS
Purge light flashing.
Probable Cause*
Exhaust pressure
switch. (see "Exhaust
Pressure Switch (see "Blower Testing
Testing and
Replacement")
LED STATUS
Valve light flashing.
Probable Cause
Hot surface igniter. Combustion system.
(see "Hot Surface
Igniter Testing and
Replacement")
LED STATUS
Power & flame
light flashing.
Probable Cause
Supply voltage
polarity.
LED status and probable cause shown below.
system to determine root cause.
Probable Cause
Thermostat circuit.
(see "Thermostat Circuit
Testing and Replacement")
Probable Cause
Intake pressure switch. Only for
Blower.
models prior to CF serial number
(see "Intake Pressure Switch
and Replacement")
Probable Cause*
(see "Combustion
System Testing and
Testing and Replacement")
Replacement")
LED status & probable cause
For models with Hot Surface Ignition
Probable Cause
Vent safety switch.
(see "Vent Safety Switch
Testing and Replacement")
Probable Cause*
Testing and Replacement")
Probable Cause
Flame sensor.
(see "Flame Sensor
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