Bradford White eF Series Troubleshooting Manual And Instructions For Service page 40

Blocked Vent Pressure Switch Testing and Replacement
Check Exhaust Tube Pressure
With monometer, take a
reading at the exhaust tube pressure
tap location. Is value negative (-) or
slightly positive (see image below).
Y
With ohmmeter check
pressure switch for continuity.
Contacts should be closed.
Y
Pressure switch O.K.
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Service Procedure VI
Is exhaust venting system
N
blocked or obstructed? Check
condensate elbow and drain.
Is vent system total length
compliant with vent tables in
the instruction manual?
Replace blocked vent switch (see
Blocked Vent Switch Testing and
Replacement, pg 38).
Is pressure in exhaust tube near 2.7" W.C. or more? If so, correct
N
blockage (above). If exhaust pressure is low (0.40" or less),
Clear obstruction.
Y
Determine cause
N
Reconfigure vent system
N
to be compliant with vent
Specifications, pg 6).
Y
replace pressure switch.
and correct.
tables (see
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