Bradford White EF60T125 Service Manual page 62

Flame Sensor Testing Procedure
Refer to illustration below, is there
a minimum of 1 micro amp during
1.5 second flame proving period?
N
With flame sensor Disconnected
from ignition module, check
continuity to ground.
Is there continuity to ground?
N
Remove flame sensor from water heater.
Check continuity from tip of flame sensor
to end of wire lead.
Is there continuity?
Y
Is flame sensor free
of oxidation?
N
Clean or replace
flame sensor.
(see "Flame Sensor
Replacement
Procedure")
Meter probe
Flame sensor
terminal
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Y
Replace flame sensor with
Y
and/or wire lead.
(see "Flame Sensor
Replacement Procedure")
N
N
Is ceramic of flame
Y
sensor cracked?
Y
Replace flame sensor.
(see "Flame Sensor
Replacement
Procedure")
Volt meter set to
Micro amps setting
(μA)
DIRECT SPARK IGNITION MODELS
120 volt potential exposure. Use caution
Refer to ignition module/control board
illustration.(24 volts should maintain beyond the
1.5 second flame proving period.)
Hot Surface Ignition Models:
Is there 24 volts AC at locations P3(2) & P3(5)?
Direct Spark Ignition Models:
Is there 24VAC between P5(5) and P5(8)?
gasket
technical support
Volt meter set to
Micro amps setting
(μA)
Meter
probe
Flame
sensor
terminal
HOT SURFACE IGNITION MODELS
CONTROL BOARD
3
2
1
6 3
8 5
4 1
J1 P5 P4
Flame sensor
terminal on
control board.
WARNING
making voltage checks to avoid
personal injury. Flame sensor may be
too hot to handle, take necessary
precautions
Y
Flame sensing circuit OK
N
Call for
Meter
Flame sensor
probe
ignition module.
1 2
1
1
3
5
1 2 3
3 1
4
P9 P10 P2 P3 P7
Meter probe
terminal on
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