Bradford White EF100T150(E)*(N Service Manual page 19

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Does combustion blower operate?
Y
Replace blower.
Can sparking be seen/heard at the
spark rod to the burner?
Y
Does Main Burner Light?
Y
Does burner continue until
thermostat set point is reached?
See setting display in Service Mode
and displaying temperature
sensors.
Y
Does blower post-purge for 30
seconds?
Y
System okay
making voltage checks to avoid personal injury.
Use caution not to damage connectors when
making voltage measurements or jumping terminals
Error code #29 on display. Refer to Control Board
N
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?
Check the voltage at the connection to the
Y
blower. Is 110-120 VAC present?
Remove high voltage wire connected at the spark rod and
N
hold approximately ¼" from metal ground with insulated
pliers during the ignition cycle (3 second spark trial period).
Is there spark to ground?
Error code #62 on display. See
N
main burner lights, no flame signal
in section "Combustion System
Testing and Replacement"
Error code #63 on display. (see
N "Combustion System Testing and
Replacement")
CONTROL BOARD
J1
System Observation
For models with Direct Spark Ignition
WARNING
120 volt potential exposure. Use caution
CAUTION
Y
N
Y
Check continuity of spark rod and spark rod
gap to burner.
(see section "Spark Rod Gap Adjustment")
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
3
1 2
2
1
6 3
8 5
1 2 3
4 1
P5 P4 P9
Replace control board if display
shows "heating" and no voltage is
N
present to the blower harness.
Make sure there are no error
codes for the temperature
sensors (following sections)
before replacing control board.
Replace wire harness.
Check resistance of high voltage
cable. Resistance should be 0-1
N
ohms. If resistance is high, replace
spark cable. If spark cable is good,
replace Control Board.
testing and replacement.
1
1
3
5
1
3
4
19
P10 P2 P3 P7
19