Service Manual

ManualsBrandsBradford White ManualsCommercialeF Series ® Ultra High Efficiency (EF) with ICON HD ® System, BMS Integration and Powered Anodes

Service Procedure II

Combustion System Testing and Replacement (Continued)

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.

WARNING

120 volt potential exposure. Isolate the appliance and

reconfirm power is disconnected using a multi-meter.

Continued from previous page.

Refer to control board illustration, is there 24VAC

between P5(5) and P5(8) (blue and brown wires)

during the flame establishing period? Note: Control

Display must show “Heating” for operating status.

Venturi

adjustment

Inlet gas

pressure tap

Replace

control board.

Can you hear or feel the

gas valve energize?

Replace the rectifier harness

and/or gas valve (see Gas

Valve Replacement

Procedure, pg 80).

Turn venturi set screw

clockwise until its bottomed

out. Turn screw counter-

clockwise 6-½ turns from

bottom.

Does burner light smoothly,

without evidence of

coughing or huffing?

Clear obstruction.

Inspect burner tube (see Burner

Tube Inspection, pg 78).

Replace flame sensor (see

Flame Sensor Replacement

Procedure, pg 87).

Does the burner stay lit?

Check flame sensor. Is there 1 to 5

micro amps (min.) during 1.5 second

flame proving period? (Value may be

displayed on the control display by

accessing Service Mode).

Check for

obstruction at inlet of

gas valve. Is the inlet

free of obstruction?

Does the burner operate

normally until the

thermostat is satisfied?

System

O.K.

Call Technical Support.