Bradford-White Corp EF100T250(E)*(N For Direct Spark Black wires at, Ignition module, Source

Does blower

Is there 120VAC

Refer to ignition module/control board

illustration.

energize?

Y

across the white and

Y

Hot Surface Ignition Models:

N

Replace

(For Direct Spark

black wires at the

Is there 120VAC between P5(1) and P5(3)?

ignition module/

terminal block ?

control board.

Ignition models,

Direct Spark Ignition Models:

ensure control display

(see photo at right)

Is there 120VAC between P7(5) and P7(3)?

shows “Heating”, raise

N

Y

temperature setpoint if

necessary)

120VAC check at

N

Determine

Terminal Block

power

source

problem

and

correct

Black wire leading to

blower motor looped

through amprobe.

Is there 120VAC

N

across the white and

Check amp draw through

black wires at the

BLACK wire lead of blower

Y

Is Blower wheel secured to Y

Call technical

terminal block ?

motor. Is there .6 to 3.0

blower motor shaft?

support.

amps?

Y

N

N

Replace blower.

(see “Blower Replacement

Refer to ignition module/

Procedure”)

Hot Surface Ignition

Hot Surface Ignition Models:

control board illustration.

Hot Surface Ignition Models:

N

Models ONLY:

Are safety circuits in normal position?

Y

Replace ignition module/

Is there 120VAC between

Refer to ignition

Y

Direct Spark Ignition Models:

P5(1) and P5(3)?

module, is there 24

Is collector high limit switch and

control board.

Direct Spark Ignition Models:

VAC between P3(7)

pressure switch in normally closed

Is there 120VAC between

and ground?

position?

P7(5) and P7(3)?

N

N

Checking for 120VAC

(Black & White Wires)

Y		Thermostat not
		calling for heat.
		(see “Thermostat
		Circuit Testing”)
Is there 120VAC
across the white and	N	Repair/replace
black wires at the
		wire harness.
blower?
(see photo at right)
Y
Replace blower.
(see “Blower
Replacement
Procedure”)

IGNITION MODULE

HOT SURFACE IGNITION MODELS

Correct safety circuit problem per

safety circuit trace

(section “Blocked Vent Pressure

Switch Testing”).

CONTROL BOARD
3		1	2
2
1	6	3			1	1	3
8	5
		1	2	3			5
					3		1
	4	1
						4
J1	P5	P4	P9	P10	P2	P3	P7

DIRECT SPARK IGNITION MODELS 52

52