Bradford-White Corp EF100T250(E)*(N, X)(A)(2) service manual Flame Sensor Testing Procedure, Gasket

Flame Sensor Testing Procedure

WARNING

120 volt potential exposure. Use caution

making voltage checks to avoid

personal injury. Flame sensor may be

too hot to handle, take necessary

precautions

					Refer to ignition module/control board
Refer to illustration below, is there					illustration.(24 volts should maintain beyond the
			Y		1.5 second flame proving period.)		Y	Flame sensing circuit OK
a minimum of 1 micro amp during					Hot Surface Ignition Models:
1.5 second flame proving period?					Is there 24 volts AC at locations P3(2) & P3(5)?
					Direct Spark Ignition Models:
N					Is there 24VAC between P5(5) and P5(8)?
				Replace flame sensor with		N
With flame sensor Disconnected						Call for
from ignition module, check			Y		gasket
					and/or wire lead.	technical support
continuity to ground.
Is there continuity to ground?				(see “Flame Sensor
N				Replacement Procedure”)
Remove flame sensor from water heater.
Check continuity from tip of flame sensor N						Volt meter set to
to end of wire lead.						Micro amps setting
Is there continuity?
						(µA)
Y
			N		Meter
					probe
Is flame sensor free	Y	Is ceramic of flame
of oxidation?		sensor cracked?			Flame
N			Y		sensor
					terminal	Meter		Flame sensor
						probe
Clean or replace								terminal on
		Replace flame sensor.
flame sensor.								ignition module.
(see “Flame Sensor		(see “Flame Sensor
			Replacement			HOT SURFACE IGNITION MODELS
Replacement
			Procedure”)
Procedure”)

Meter probe

Flame sensor

terminal

Volt meter set to

Micro amps setting

(µA)

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

Flame sensor

terminal onMeter probe control board.

DIRECT SPARK IGNITION MODELS 62

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