Blower Prover Open - A.O. Smith BTX 100 Service Handbook

fault messages
displayed message/Condition/indiCates

blower prover open

(Combustion Blower not Running)
The Control System has detected the Blower Prover
switch has open contacts after the Combustion Blower
has been energized.
Blower Prover Open
Fault occurred 2 mins ago
The blower prover switch remains
open after the blower has been
energized.
Call a service professional:
Your Company Name Here
(press [DOWN] for more....)
CHANGE
Important Service Reminder:
When performing any troubleshooting steps outlined in
this manual always consider the wiring and connectors
between components. Perform a close visual inspection
of all wiring and connectors to a given component before
replacement.
blower prover open
(Combustion Blower Is Running)
The Control System has detected
Blower Prover Open
Fault occurred 2 mins ago
The blower prover switch remains
open after the blower has been
energized.
Call a service professional:
Your Company Name Here
(press [DOWN] for more....)
CHANGE
BACK ADVANCED
BACK ADVANCED
Servicing should only be performed by a Qualified Service Agent
possible Causes - CheCK/repair
perform all these tests with power
turned on and a Call for heat aCtive.
• Check for 120 VAC at the CCB's J2 Socket (page 41)
pins 1 & 2. Perform a close visual inspection of the
pins inside the plug and socket - ensure plugs and
sockets are mating properly and providing good
contact.
• Check all wiring between CCB's J2 Socket pins 1 &
2 and the Combustion Blower's high voltage 3 Pin
Socket. See Combustion Blower on page 11.
• disconnect the plug at the Combustion Blower's high
voltage 3 Pin Socket - check for 120 VAC at the plug
end.
• Perform close visual inspection of the pins inside the
plug and socket at the Combustion Blower's high
voltage 3 Pin Socket - ensure the plugs and sockets
are mating properly and providing good contact.
• disconnect the plug at the Combustion Blower's low
voltage PWM 5 pin plug. See Combustion Blower
on page 11. If the Combustion Blower has not been
running prior and starts running when this plug
is disconnected - call the toll free support phone
number on the back cover of this manual for further
assistance.
• Ensure the Blower Prover switch sensing tube is
connected properly at both ends and that it is not
kinked or damaged. Repair/replace anything worn or
damaged as necessary. See Sensing Tubes on page
30.
• Check all wiring between CCB's J6 Socket (page
41) pins 6 & 7 and the Blower Prover switch. Repair/
replace anything worn or damaged as necessary.
• Perform close visual inspection of the pins inside the
CCB J6 plug and socket - ensure plugs and sockets
are mating properly and providing good contact.
• Perform the Pressure Switch Tests on page 31.
Replace the Blower Prover switch if it is defective.
• Call the toll free support phone number on the back
cover of this manual for further assistance if the
problem has not been corrected after performing the
procedures outlined here.
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