
24
Problem
LED Flashing
Is Air
-Pr
o
ving
Switch Shor
ted?
(Check Continuity on
Air
-Pr
o
ving Switch in
Open and Closed
P
ositions).
Ye
s
R
epair Air
-Pr
o
ving Switch
Is
Air Pr
o
ving Switch
Stuck Closed?
Check Continuity
.
Is Air
flo
w Switch
Binding?
R
epair
.
Ye
s
Ye
s
No
No
R
eplace Air
-Pr
o
ving Switch
No
Def
ectiv
e Wire or Loose Connection
to
Air
-Pr
o
ving Switch
R
epair Wire or Connection
One T
ime
Air proving Switch
Contacts Are Closed
before Fan Motor
S
tarts.
Pattern Begins 5
Seconds After
Condition
Occurs.