Original Aprilaire #4040 replacement solenoid valve. 24 VAC 2.3 Watts Replacement solenoid value for Aprilaire Humidifier models 220, 224, 400, 440, 500, 550, 558, 560, 568, 600, 700, 760, 768. The #4040 soleniod valve includes a new inline strainer (pre-inserted in inlet side of valve), and a compression nut & washer for the inlet side only. Solenoid Valve Replacement Instructions For power units unplug electrical cord. For bypass units turn off power to furnace. Also turn the humidistat off. Shut off water supply at the saddle valve Disconnect inlet and outlet water compression nuts. Double wrench. Note, some water may drip on floor. Remove the orifice (which controls the water flow) from the plastic or copper tube and make sure there is no obstruction. If blocked clean or replace. Remove the wire nuts from the water solenoid valve wire connections. Set aside. Remove screws that secure valve to unit. Attach new valve with screws. Do not over-torque screws into plastic housing. Reconnect wires with wire nuts. For units with plastic feed tubes inspect for brittleness, hairline cracks, nicks or abrasions, etc. Replace if necessary. Reconnect the water lines, double wrenching the compression nuts. Turn water back on and check system for leaks. Tighten compression nuts as necessary. Restore electrical service and activate furnace by turning up the thermostat. Turn up humidistat to verify operation of humidifier. Recheck for leaks. Turn down humidistat to make sure valve shuts off. Reset humidistat and thermostat to original levels.

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Aprilaire #4040 Solenoid

		$54.95		BizRate Rating Outstanding 9.1
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Product Reviews

Last update: Nov 17, 2009

Aprilaire #4040 Solenoid Reviews

Most helpful positive review

Most helpful negative review

★★★★☆

4.0

Perfect replacement and a great price.

"This soleniod is a perfect-fit replacement for the original solenoid (which is no longer made) on several April-aire model humidifiers. It appears well made [...] The water fittings are all one piece, unlike the original factory solenoid which had both inlet and outlet fittings, meaning more joints to possibly leak. Only negative is that the one piece water fitting makes it more difficult to remove the water ..." Read Full Review »

Apr 10, 2008 by Jim

See more positive Aprilaire #4040 Solenoid reviews

★☆☆☆☆

1.0

Not same part on Aprilaire 600

"This solenoid is not the same solenoid as came with my Aprilaire model 600 when new. The wires are too short and there is a filter on the intake to clog up with hard water deposits. If this was supposed to be the OEM solenoid replacement then that means it is a direct replacement. It is not. Item was returned and then I did not get my shipping charges reimbursed for Aprilaire's mistake. If I get reimbursed f..." Read Full Review »

Mar 24, 2009 by William "B.J." Rogers

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Displaying 1 - 5 of 71 Reviews

Aprilaire #4040 Solenoid Review

good price[...]

★★★★★

5.0

"Would purchase parts in the future. Part [...], was a fair price and fit with easy installation. Completely satisfied with yourcompany. "

Bottom Line Yes, I would recommend this to a friend

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Nov 10 2009

mr. fixit

ohio

I am:

Homeowner

Reviewed at:

Price: $54.95

Aprilaire #4040 Solenoid Review

would buy this product again

★★★★☆

4.0

"It works fine and easy to replace old solenoid valve to new one. Great works and the water run to stop when humidfier system turn off.

Thank for your service advice. "

Bottom Line Yes, I would recommend this to a friend

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Nov 17 2009

CDC

Pittsford, NY

I am:

Homeowner

Reviewed at:

Price: $54.95

Aprilaire #4040 Solenoid Review

Perfect replacement and a great price.

★★★★☆

4.0

Bottom Line Yes, I would recommend this to a friend

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Apr 10 2008

Jim

Roswell, GA

I am:

Handyman
Homeowner

Reviewed at:

Price: $54.95

[1 of 1 customers found this review helpful]

Aprilaire #4040 Solenoid Review

Does the job when it works

★★★★☆

4.0

"This product is easy to install and operates as expected. However, my experience is the product normally fails about 2-3 years into service. The failure mode is inability to prevent continuous delivery of water into the humidifier (mechanical, not electrical). i.e. the valve stays in the open positi …" Read Full Review »

Bottom Line Yes, I would recommend this to a friend

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Jan 13 2009

Codeman

Chicago

I am:

Homeowner

Reviewed at:

Price: $54.95

Aprilaire #4040 Solenoid Review

I would buy this from you again

★★★★★

5.0

"The reason that I got the Aprilaire Valve from you was, The company that carries this valve in Cincinnati would not sell it to me because he said that I was not a sevice tech for Aprilaire in this area but he did sell the # 12 filter, this is the only reason that I had got the unit from you. What is …" Read Full Review »

Bottom Line Yes, I would recommend this to a friend

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Jan 19 2009

Doug

Cincinnati Ohio

I am:

Homeowner

Reviewed at:

Price: $54.95

Displaying 1 - 5 of 71 Reviews

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Aprilaire #4040 Solenoid

Aprilaire #4040 Solenoid