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Marc, Plumber
Category: Plumbing
Satisfied Customers: 1594
Experience:  Plumbing heating & home maintenance contractor
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I have a Fasco Ind.motor div.#702110548 type U218 (rpm300--v115)auto

Resolved Question:

I have a Fasco Ind.motor div.#702110548 type U218 (rpm300--v115)auto air blower that is installed in the top of a 40 gal.gas hot water made by State Industries Inc.Model #SPR640.
About 2 weeks ago the Fasco air blower started working in a continuos mode rather than automatic.
I certainly would appreciate suggestions. My email is [email protected]
Submitted: 5 years ago.
Category: Plumbing
Expert:  Marc replied 5 years ago.
Hello and thank you for using, I will assist you today with your question. Please accept the answer upon completion of the Q&A process.
The blower assembly continuously blowing typically results In The unit faulting and not firing to produce hot water. Most likely caused by the proving switch also located on the blower assembly. It tells the unit that the blower is exhausting properly. The switch, typically on the right hand side of the blower is usually round, has a 1/4tube going into it. You can try unplugging the water heater and resetting it first, if this does not work the. Unplugg the switch and attempt to jump it out. Typically the switch is the culprit. It may need to be replaced but jumping the switch will tell you for sure. You can also unplug the tube from the vent (leave attached to the switch) and suck on it to create a vacuum. It should click on and off. Your unit should fire while a vacuum is pulled.
One last item to check is the vent to make sure it is clear.
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Expert:  Marc replied 5 years ago.
If I can further assist you with this question please feel free to respond.

If you are completed with this question please click on the accept button to close the question.

Thank you and have a great day!!