Question about Heating & Cooling

1 Answer

Proper install on forced vent AO smith ware tank.Need install directions for proper install.I think my plumber may have been wrong.In 10 years I have gone thru one tank and I am on my 3rd.blower Fasco7021-10910 Blower runs way to hot it seems to me.They fail with signs of heat damage?

Posted by Anonymous on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 27 Answers

It seems like something is wrong with the heater install, I have seen issues surface multiple times in years but I always dig deeper to find the real source of the problem (which is what you are doing! So glad). Here is a spec sheet (real basic info). Here is the full catalog (Install manual, operating manual, and service manual). This is for GDV/GDVT models, check your model, most piping diagrams for AO Smith are the same sizes. Here is the website for AO Smith residential that you can walk through: AO Smith website
Hope this helps you resolve the issue James

Posted on Apr 07, 2011

  • 1 more comment 
  • Anonymous Apr 07, 2011

    James thanks for the info.My real problem is why I keep burning out my Fasco 7021-10910 Power vent blower I think they should last as long as the water Tank! Any help in this area would be Great.Hate to say it but my luck with contractors has been Jaded and I can't afford any more of there guessing.

  • Anonymous Apr 07, 2011

    James thanks for the info.My real problem is why I keep burning out my Fasco 7021-10910 Power vent blower I think they should last as long as the water Tank! Any help in this area would be Great.Hate to say it but my luck with contractors has been Jaded and I can't afford any more of there guessing.

  • James Barrett
    James Barrett Apr 07, 2011

    Hello again!

    Some things you can check are the vent length (check for elbows too- they create resistance and ultimately excessive heat on the motor pushing exhaust through the vent), you can check the gas supply- if the pressure is too high it can cause high/excess heat exhaust. You can also check ambient temperature in the room/space the water heater is located, if it is too high it can be causing to much heat on the motors, anywhere below 85 deg is fine.
    Usually where these water heaters fail is because they were installed improperly- usually the venting is too long...

    Hope this gives more resolution,



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

4 Answers

How do I fix slow drain brand new plumbing?

The drain pipe may not have been installed correctly - the slope may be wrong, or the pipe may be too small, or you may have too much backpressure, or if you have a septic tank it may be full and need pumping, or any number of other possible problems. You might have another plumber come for an assessment and opinion - make it clear that you don't necessarily intend to hire them to do any WORK, you just want their opinion. Then they won't try to sell you all new plumbing to replace what you just bought...

Jun 26, 2014 | Grohe Plumbing

1 Answer

Water was pouring out the top of my hot water tank and I would like to know can it be repaired at a affordable price or if it need to be replaced will it be affordable it is a Master Plumber Reliance 501...

Unit is probably rusted out:

Reliance is AO Smith. I recommend the AO Smith line-up of water heater brands as best because air intake screen is located on bottom of unit and can be cleaned by homeowner without removing combustion parts, and because AO Smith posts service manuals.

Add a comment with more detail about leak.

Mar 18, 2013 | Water Heaters

1 Answer

I have a Rinnai Tankless and I have a problem with the water going from hot to cold so I called to have it serviced, I was told that it needed to be flushed to remove settlement from the unit. Okay we did...

Did service man clean combustion parts and check for loose wires, proper venting etc?
In other words, is the tankless up-to-date on yearly required maintenance?
Did you check outlet for power?
Is the unit properly grounded?
Is the unit vented properly, and set for correct altitude?
Is the thermostat set too high?
What does the manual say about maintenance?
It certainly says to clean water filter frequently, and clean combustion parts yearly, and bleed air from gas line, and delime yearly.
Is your water heater exposed to more than 11 grains hardness in water that will cause failure due to clogged parts?

Does service man have a service manual for your specific water heater?
Does anyone have a service manual for your water heater? Probably not, which means service man will be guessing at one thing and then guessing at the next thing.

Problem could be PC board failure.
Similar to failed motherboard on computer.

Let's be frank:
Do you want the cheapest solution?
Or do you want to chase around trying to find why a complex computer chip connected to electric outlet, electric sensors, gas valve, water valve, water line, gas line, and gas burner with vent to outside has decided to stop working?

Cheap solution, Buy tank-type gas water heater for $350 at local box store. Just get a simple one off the shelf. Don't worry about warranty, because it means nothing.
Select Whirlpool, AO Smith, American, State, Reliance, Craftmaster, Kenmore because these are made by same company and can be repaired and maintained by homeowner, and service manuals are available, and any plumber knows how to fix em..
Avoid Rheem, Ruud, Richmond, GE, for all same reasons except in reverse.
Read the manual, perform the required maintenance.
Keep the air intake clean.
Install water heater yourself same day, turn up the temperature wait, 1/2 hour for tank-full of hot water, and take hot shower.

Oct 05, 2012 | Rinnai Webstone The isolator EXP tankless...

1 Answer

Wiring diagram on whirlpool gas water heater

Whirlpool is AO Smith tank-type heater.
Year, model, type of heater not known.
So add a comment and then expert can look up the manual.

You probably have power vent, or dampered water heater, otherwise the only wiring would be for thermopile, thermal reset, and igniter.
Power vent, or dampered, of flow control water heaters plug into outlet, and wires from gas control run to the various components.
Copy following link to troubleshoot by type of gas control valve:

Don't forget to add comment and include model number that shows on label located side of tank.

Sep 21, 2012 | Whirlpool 6th Sense 40-Gallon 6-Year Tall...

1 Answer

Water not as hot as it was.

Tankless require yearly service to keep burner and combustion parts clean and check electrical connections, gas solenoid, gas pressure, venting, etc.
Read product manual for advisories and recommended maintenance.
Yes, aren't you glad you saved the manual.
Always check that local area has affordable and qualified service technician for your brand before buying tankless.
Before calling service technician, copy following link for general troubleshoot resources, including some manuals, and links to Bosch.

Try turning temperature down.
The fact there is no error code, and the gas is not firing correctly, means you have a small unit with no error codes and PC board has failed ... or it means you have a unit with error codes and possibly bad PC board.
If problem is the PC board, then Bosch will send you new board, and expect same level of repair success as though your computer's motherboard was replaced.

You can buy ordinary box-store tank-type heater and install yourself same day for about $325.
Then maintain and fix it yourself. I recommend AO Smith/American/State/Reliance/Kenmore/Whirlpool since these are easy to maintain with clear directions in manual, plus AO Smith posts service manuals for the whole line of products, and any local plumber can fix them with ez-to-locate generic parts.

Sep 07, 2012 | Bosch & Tankless Water Heater

1 Answer

AO Smith Water heater FPSH50-260 keeps blowing fuses

FPSH series is a power vented residential gas water heater.

1) The blower is plugged into 120Volt outlet. If blower has short, then it will trip breaker.
Blower could be Fasco model 7021-10195, or 7021-10770. Call AO Smith: 1-800-527-1953. They will need model number and serial number located on label on side of tank.

2) Before calling AO Smith, check outlet with circuit analyzer. Outlet must have correct polarity and must be grounded. Unplug cord to water heater and run continuity test from ground prong on electrical plug to manifold tube on gas valve.

3) Also if a fluorescent light fixture is on the same breaker, that can cause burner to short cycle.

4) Connect water heater to different outlet and see if problem continues.

5) AO SmIth has service manuals for the FPSH series that download to your computer:

Sep 20, 2011 | Water Heaters

1 Answer

We have a AO Smith water heater Model CYCLONE X1 s/n - 0813A001865 we are having issues with this unit. The unit iwas purchased in 2008. Can you send me information on this water heater. Our plumber bought...

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.

Aug 22, 2011 | Smith A.O. SMITH Cyclone XHE Natural Gas...

1 Answer

The pilot light on my hot water heater keeps going out

If you have a blower and electronic gas control on your AO Smith water heater, then reading the manual for your specific product is essential for troubleshooting the problem.

As you know, tank-type gas water heaters require periodic inspection and cleaning of burner parts and combustion chamber.. The manual is important for giving instructions and advisories to the homeowner and technical specialist.

If you have ordinary direct vent water heater with mechanical gas control the following link has some troubleshooting resources that might help:

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

May 19, 2011 | RTO W4 A.O Smith Gas Hot Water Heater...

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

101 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

2598 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Donni Steen

Level 3 Expert

659 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides