AO Smith Blower Housing

Old 12-14-10, 05:08 PM
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AO Smith Blower Housing

Series 234
Serial # ML98-0025622-234
Model J00N010000

Sometimes when it calls for the blower to kick on / flame on, the motor has a hard time getting spinning. This I know is because when it rubs, it gets a little stuck, and if it's at this point, the motor hums. I can actually twist on the impeller housing a bit to get it going.

The Inducer Fan "Squirrel Cage" plastic impeller blade is warped, and rubs the housing. The reason it warped is due to overheating, caused by the PVC 90 a couple of feet above the unit cracked in half. That is fixed now. I took out the 90 and replace it with a 'sweep' 90, I think the regular 90 PVC was causing it to heat up too much.

Searching for replacement - only comes up with this part, which is the WHOLE exhaust unit, which includes the control box, motor and fan/housing - 9004434105 (9004434105 - AO Smith 9004434105 - Blower Assembly, Model FPSH-40/50, Series 234/235) (182775 old part #)
which runs anywhere from $350 - $550. It is made by FASCO for AO Smith.

Does anyone know if you can order and replace ONLY the squirrel cage fan inside the housing?

There is another FASCO unit - 7021-10195 - LINK (W4 Draft Inducer for A.O Smith Hot Water Heater)

That is a 'six prong' that looks like it has the same impeller housing, does anyone know if this is the same impeller / different electronics?

Old 12-14-10, 05:52 PM
lawrosa's Avatar
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Join Date: Dec 2010
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Hi. Hot water heater is 12 yrs old this Month. ML 98 is December of 1998.

Instead of throwing money at it it might be better to replace the whole unit. You could change the fan but then it might start leaking next week. After 10 yrs you never know. You got its useful life out of it.

But if you insist on changing the fan I would call AO smith. I believe they are cheaper then the prices you stated. We bought them for $150.

I think the bearings go so I would not recommend repair.

Hope this helps.


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