Question about Smith A.O. SMITH Cyclone XHE Natural Gas Commercial Water Heater BTH-120

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I have a commercial water heater and on the screen it says "Blower Prover Open" and i have no hot water at any sinks.

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The fan is not operating -- when this conditon exists, the unit will not fire up. Here's a link to the manual. The unit needs servicing.

http://www.hotwater.com/lit/im/com_gas/318556-000.pdf


Here are some excerpts from the manual relative to the blower prover and error msgs.



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

energized.

Call a service professional:

Your Company Name Here

(press [DOWN] for more....)



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.




Charlie

Posted on Mar 20, 2011

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1 Answer

AO error code on 250k btu hayward pool heater


Dear ,

Please try the below solutions,

Solution 1:
If the blower prover switch does not close after the blower starts the control will stop the ignition trial go into lockout. The blower will continue to run. Automatic reset is immediate after the switch closes
Solution 2:
If the blower prover switch opens unexpectedly during operation the control will shut down and attempt to re-light. If the switch does not close after the blower starts the control will go into lockout with the blower running. Automatic reset is immediate after error is corrected
Solution 3:
If the blower prover switch opens during the postpurge cycle (heater is not fir- ing) the control will display the error code. The post-purge cycle will be com- pleted once the blower prover switch close
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This error is produced when the blower prover switch does not close after the blower starts, the control will stop the ignition and go into lockout. Automatic reset is immediate after the blower prover switch closes.

If you keep having this problem, contact a reputable service company, especially if it's under warranty.

The link to the owners manual is below, it references fault codes, etc..

Hope this helps.

http://74.125.95.132/search?q=cache:4mAdY7bLfoQJ:www.haywardnet.com/products/Manuals/pdfs/Manual227.pdf+hayward+AO+error

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http://waterheatertimer.org/Water-heater-recirculation-system.html

When recirculation pump is running, both hot and cold water lines have hot water.
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If the blower prover switch opens unexpectedly during operation the control will
shut down and attempt to re-light. If the switch does not close after the blower
starts the control will go into lockout with the blower running. Automatic reset is
immediate after error is corrected.

If the blower prover switch does not close after the blower starts the control will
stop the ignition trial go into lockout. The blower will continue to run. Automatic
reset is immediate after the switch closes.

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AO error


This error is produced when the blower prover switch does not close after the blower starts, the control will stop the ignition and go into lockout. Automatic reset is immediate after the blower prover switch closes.

If you keep having this problem, contact a reputable service company, especially if it's under warranty.

The link to the owners manual is below, it references fault codes, etc..

Hope this helps.

http://74.125.95.132/search?q=cache:4mAdY7bLfoQJ:www.haywardnet.com/products/Manuals/pdfs/Manual227.pdf+hayward+AO+error&cd=7&hl=en&ct=clnk&gl=us

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