Bradford-White Corp EF100T399(E)*(N Refer to ignition module, Red Wires Temperature Sensor

Thermostat circuit.

(continued from page 37)

For models with Hot Surface Ignition

WARNING

120 volt potential exposure. Use caution

making voltage checks to avoid personal injury.

Refer to ignition module

illustration, Is there 120VAC between P1(1) and P1(3)?

Y

Refer to ignition module

illustration, Is there 22 - 27VAC between P2(1) and P2(2)?

Y

	Check AC source to
	determine why there is no
	power.
	Replace
	ignition module.
	(see “Ignition Module
	Replacement”)
		Y
N	Refer to ignition module		N
	illustration, Is there 120VAC
	between P7(3) and P7(1)?
N	Replace transformer.
	(see Transformer
	Replacement)

IGNITION MODULE

Red Wires

(Temperature Sensor)

		Check continuity through
		ECO, red wires of
Refer to ignition module	Y	thermostat sensor.	Y
illustration, Is there 24VAC		Check at temperature
between P3(9) and P2(1).		less than 160°F
N		Is there continuity?
		(see photo at right)
Replace ignition module.		N
(see “Ignition Module
Replacement”)		Check wire harness
		continuity. Replace
		thermostat sensor or wire
		harness as necessary.
		(see “Thermostat Sensor
		Replacement Procedure”)
		Replace thermostat
		circuit board.
		(see “Thermostat Board
		Replacement Procedure”)

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