Bradford White EF100T150(E)*(N Service Manual page 44

Observe burner operation through the sight glass located on the combustion insert mounting flange. Normal burner
operation should ignite smoothly, without evidence of coughing or huffing upon ignition. The burner flame should be a
blue flame near the burner surface in a uniform flame pattern. Occasional yellow or white streaks are normal.
For models with Hot Surface Ignition System
Continued from
previous page
Refer to ignition module illustration below,
is there 24VAC between P3(2) and P3(5) (blue and
brown wires) during the flame establishing period?
(Note: Valve LED must be lit during this check)
Can you hear or feel
gas valve energize?
Y
Turn VENTURI set screw clockwise until its
bottomed out. Turn screw counter-clockwise 6-½
turns from bottom (see illustration below). Note:
EF100T399 models do not have a venturi screw.
The gas regulator setting should be 1 - 1 ¼ turns
out from bottom.
Does burner light
smoothly, without
evidence of coughing
or huffing?
Does flame LED on the module
light and stay lit?
Check flame sensor,
Is there 1 to 5 micro amps
(min.) during 1.5 second
flame proving period?
(see "Flame Sensor Testing
Procedure")
Replace flame sensor
(see "Flame Sensor
Replacement
Procedure")
44
N
Y
Replace Rectifier harness and/or
N
(see "Gas Valve Replacement
N
Y
Check for obstruction
at inlet of gas valve.
N Is inlet free of
obstruction?
Y
Y
Call for technical
support
Does burner operate
Y
normaly until thermostat is
N
Y
N
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Replace
ignition module.
(see "Ignition Module
Replacement Procedure")
gas valve.
Procedure")
Clear obstruction
Venturi
adjustment
N
satisfied?
Y
System OK
EF100T399
Only
WARNING
IGNITION MODULE
N Inspect burner tube, (see "Burner
Tube Inspection and Replacement")
Inlet gas
pressure tap
Gas valve
regulator
44