Bradford-White Corp D38T155 Service Procedure D24-III, Main Burner Operation Testing

SERVICE PROCEDURE D24-III

Main Burner Operation Testing

DANGER

120 volt exposure. To avoid personal injury, use caution while performing this procedure.

CAUTION

Be Careful When Making Voltage

Measurements or Jumping Terminals

Not to Damage or Deform Connectors or

Connector Pins.

Condition:

Main burner will not light,

Ignition module LED is “ON”

Ground

Disconnect “brown”

wire from “MV”

location of ignition

Is Pilot lit?

N

See “pilot will not light”

module.

(page 8).

Check voltage from

Y

“MV” Terminal of

Ignition module

14

& ground.

Does module continue to spark Y

See “Pilot lights, no flame signal”

with pilot lit?

(Page 9).

N

Be sure module LED is “ON”,

Disconnect “brown” wire from

“MV” terminal of ignition module.

N

pilot is lit and module is not sparking

N

Replace ignition

Is there 22-27 volts AC across

Recheck voltage across

module

“MV” terminal of Ignition Module & ground?

“MV” terminal of Ignition Module & ground.

(see photo 14)

Is voltage present?

Y

Y

Reconnect brown wire

to ignition module.

Brown wire disconnected

from “MV” terminal of gas

Ground lug of

Disconnect brown wire lead from

valve

gas valve

Check incoming gas pressure to

“MV” terminal of gas valve.

Y

gas valve. if okay,

Is there 22-27 volts AC across

15

brown wire lead & ground

replace gas valve.

(see photo 15)

N

Check wire harness for damage or

loose connections. Repair or replace

as needed.

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