Bradford White UCG100H399, Service Manual

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Ser vi ce Proce du re I X:
B l oc k e d V e nt S wit c h Insp ec ti o n and Re pla ce m e nt
B l oc k e d V e nt S wit c h Proce du re
S tep 1 . F irst determine i f the “ B l ocked V ent Sw itch ”
w as insta ll ed correct l y on the dra f thood ( see
picture right ) .
S tep 2. W hen Error C ode 2 6 is present you f irst must
determine i f there is a b l ocked vent condition
present . I f so, c l ear the obstruction and reset
the s w itch then continue w ith norma l
operation .
S tep 3 . I f the s w itch is tripped and there is no
obstruction in the venting there cou l d have
been an extended do w n dra f t that tripped the
s w itch . The do w n dra f t cou l d have been
caused by damage vent termination . C ontact
your p l umbing pro f essiona l to correct this
issue .
S tep 4. W hen no b l ockage or do w ndra f t issues are present check the continuity o f the s w itch ( see photo be l o w) . I f
there is no continuity present even w hen s w itch is reset the b l ocked vent s w itch assemb l y needs to be
rep l aced .
S tep 5 . I f b l ocked vent s w itch assemb l y is f unctioning correct l y check to see i f the w ire harness has any signs o f
damage . R ep l ace harness i f any signs o f damage exist .
S tep 6 . R estore w ater heater to use and con f irm proper operation f o ll o w ing the l ighting instructions on the l ighting
instruction l abe l or the l ighting instruction l ocated in the insta ll ation and operating instruction manua l.
.
S et V o l tmeter to O hms .
The s w itch shou l d be
very c l ose to 0 O hms
B l ocked V ent
Sw itch shou l d be
insta ll ed on the l ip
o f the dra f thood .
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