Question about Smith A.O. SMITH Cyclone XHE Natural Gas Commercial Water Heater BTH-120
Does the fan need to be replaced if tubes look good and the electrical connections are good.
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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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