Question about Smith A.O. SMITH Cyclone XHE Natural Gas Commercial Water Heater BTH-120
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Posted on Jan 02, 2017
SOURCE: We have a AO Smith
This doesn't sound fun. I would call the AO Smith technical support number and they might be able to help you figure this out. I hope this helps.
Please vote for this answer. Thank you.
Posted on Aug 23, 2011
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If the Blower Prover switch contacts do not close after the
Combustion Blower is energized the Control System will lock out and display Blower Prover Open
Blower Prover Open
Fault occurred 2 mins ago
The blower prover switch remains
open after the blower has been
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These plastic sensing tubes must be routed to the correct sensing ports on the water heater. Sensing tube
routing should always be checked whenever Blower Prover Open, Blower Prover Failure, Blocked Air
Intake or Blocked Exhaust is displayed on the Control System LCD, see Figure 31 on page 29. These "Fault
Conditions" can be caused by incorrect sensing tube routing.
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