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Bradford White EF-100T-399-3X User Manual

Page 19

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System Observation

For models with Direct Spark Ignition

Does combustion blower operate?

Error code #29 on display. Refer to Control Board

illustration. Measure voltage between terminals

P7(3) &

P7(5) on the “inducer” output (make sure the control display

shows “heating” in the status mode, if not increase the

setpoint). Is there 110-120 VAC?

Replace control board if display

shows “heating” and no voltage is

present to the blower harness.

Make sure there are no error

codes for the temperature

sensors (following sections)

before replacing control board.

Check the voltage at the connection to the

blower. Is 110-120 VAC present?

Can sparking be seen/heard at the

spark rod to the burner?

Does Main Burner Light?

Error code #62 on display. See

main burner lights, no flame signal

in section “Combustion System

Testing and Replacement”

Does burner continue until

thermostat set point is reached?

See setting display in Service Mode

and displaying temperature

sensors.

Error code #63 on display. (see

“Combustion System Testing and

Replacement”)

Does blower post-purge for 30

seconds?

System okay

N

Y

N

N

N

Y

Y

Y

Y

From previous page

N

CAUTION

Use caution not to damage connectors when

making voltage measurements or jumping terminals

WARNING

120 volt potential exposure. Use caution

making voltage checks to avoid personal injury.

1

2

3

8

6
5
4

3

1

1

2

1

4

1

3

3

2

1

1

5

3

P2

P4

P5

P7

P3

CONTROL BOARD

P10

P9

J1

Y

Replace wire harness.

Replace blower.

N

Remove high voltage wire connected at the spark rod and

hold approximately ¼" from metal ground with insulated

pliers during the ignition cycle (3 second spark trial period).

Is there spark to ground?

N

Check resistance of high voltage

cable. Resistance should be 0-1

ohms. If resistance is high, replace

spark cable. If spark cable is good,

replace Control Board.

Check continuity of spark rod and spark rod

gap to burner.

(see section “Spark Rod Gap Adjustment”)

Y

Y

19

Check to see if control display shows any other error

codes (29, pressure switch, 26, vent safety switch, or 65,

high limit). If so, refer to the appropriate section for

testing and replacement.

19

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