Appliance Parts [Lifetime Warranty] B2015-S85 B2017-S85 4040 24V Humidifier Solenoid Valve
B2017-S85 24V humidifier solenoid valve with mounting bracket and blue wire leads.
4040 24V humidifier water solenoid valve with control unit and compatibility list.
Dimensional diagram of 24V humidifier solenoid valve showing 3.3-inch width and 2.2-inch height specifications.
4040 24V humidifier solenoid valve with mounting bracket and blue wire connection for water flow regulation.
Detailed view of 24V humidifier solenoid valve components including wiring, screw, label, and brass thread.
24V humidifier solenoid valve replacement part for B2015-S85 and B2017-S85 models with blue wiring.
24V humidifier solenoid valve showing water inlet flow direction arrow for easy installation.
Comparison chart showing BlueStars 24V humidifier solenoid valve durability versus lower quality alternatives.
24V humidifier solenoid valve with mounting bracket and blue wire leads for B2015-S85 and B2017-S85 models.
B2017-S85 24V humidifier solenoid valve with mounting bracket and blue wire leads.
4040 24V humidifier water solenoid valve with control unit and compatibility list.
Dimensional diagram of 24V humidifier solenoid valve showing 3.3-inch width and 2.2-inch height specifications.
4040 24V humidifier solenoid valve with mounting bracket and blue wire connection for water flow regulation.
Detailed view of 24V humidifier solenoid valve components including wiring, screw, label, and brass thread.
24V humidifier solenoid valve replacement part for B2015-S85 and B2017-S85 models with blue wiring.
24V humidifier solenoid valve showing water inlet flow direction arrow for easy installation.
Comparison chart showing BlueStars 24V humidifier solenoid valve durability versus lower quality alternatives.
24V humidifier solenoid valve with mounting bracket and blue wire leads for B2015-S85 and B2017-S85 models.
Lifetime Warranty

[Lifetime Warranty] B2015-S85 B2017-S85 4040 24V Humidifier Solenoid Valve

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B2015-S85 B2017-S85 4040 24V Humidifier Solenoid Valve

Key Features

  • Electrical Rating: 24 Volts, 2.3 Watts, 60 Hz
  • Construction: Durable brass body
  • Inlet: Threaded with an integrated strainer screen to filter debris
  • Function: Controls water flow to the humidifier distribution tray

Replaces / Cross-Reference Part Numbers

  • 4040
  • B2015-S85
  • B2017-S85
  • 4040-001

Compatibility & Fitment

  • Fits Aprilaire humidifier models including the 200, 400, 500, 600, and 700 series.
  • Specific compatible models include: 220, 224, 400A, 400M, 440, 500, 500A, 500M, 550, 550A, 558, 560, 560A, 600, 600A, 600M, 700, 700A, 700M, 760, 760A, 768

When to Replace

  • Humidifier fails to produce humidity due to lack of water flow.
  • Water continuously runs or leaks from the valve when closed.
  • Valve produces a loud buzzing or humming sound but does not open.
  • Visible cracks, corrosion, or damage to the valve body or electrical connections.

Installation Tips

  • Disconnect power to the furnace and shut off the water supply before starting.
  • Note the orientation of the old valve and install the new one in the same direction of water flow.
  • Use pipe thread sealant on male threads for a leak-free connection. Do not overtighten.
  • After installation, turn the water supply back on and check for leaks before restoring power.
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Product image
Product image
  • COMPATIBLE MODEL

    COMPATIBLE MODEL

    This 4040 Humidifier Water Solenoid Valve includes a compression nut, a washer, and an inline strainer.
  • PREMIUM QUALITY

    PREMIUM QUALITY

    Our Water Solenoid Valve is manufactured from rustless Metal & Brass materials, meeting or exceeding standards for durability and performance.
  • SAVING SOLUTION

    SAVING SOLUTION

    It fixed the issue with the old valve not shutting off or water running continuously. BlueStars brings DIY solutions to help deal with any trouble.
  • IMPORTANT NOTE

    IMPORTANT NOTE

    This is a replacement part designed to be compatible with certain appliances. Any brand names mentioned are used solely to indicate compatibility.
CONNECTING LIVES, ENERGIZING MOMENTS

CONNECTING LIVES, ENERGIZING MOMENTS

Compatible with Aprilaire Whole House Humidifier models 400, 400M, 500, 500M, 600, 600M, 558, 550A, 550, 568, 560A, 560, 700, 700M, 768, 760A, 760, etc (Note: Please check the measures and your appliance model carefully before purchasing to ensure that you receive the correct part)
4 SIMPLE STEPS

4 SIMPLE STEPS

1. Turn off the power and shut off the water valve supplying the humidifier; 2. Disconnect the 2 wires attached to the old solenoid valve; 3. Unscrew inlet/outlet compression nuts using 1/2in and 7/16in wrenches. Remove the old valve with a Phillips head screwdriver; 4. Install the new valve and reconnect water lines (Note: Please follow the arrows for flow direction (important during winter to prevent freezing in the lines))
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#1 SOURCE OF HIGH-QUALITY REPLACEMENT PARTS

Enjoy the comfort that our small yet mighty parts bring to your home

FAQ

This valve is designed for Aprilaire whole-house humidifiers utilizing part numbers B2015-S85, B2017-S85, or 4040. Compatible models include 220, 224, 400, 400A, 400M, 440, 500, 500A, 500M, 550, 550A, 558, 560, 560A, 600, 600A, 600M, 700, 700A, 700M, 760, 760A, and 768. Because model revisions can vary, please confirm the part number on your original valve before ordering.
This humidifier water solenoid valve replaces B2015-S85, B2017-S85, 4040, and 4040-APR. Matching the number stamped on your existing valve is the most reliable way to verify compatibility.
A failed or restricted solenoid valve often causes little or no water flow to the humidifier. Common symptoms include the humidifier running without producing humidity, no water reaching the distribution tray or pad, a humming valve that does not open, or a valve that leaks or sticks. If the humidifier has correct 24V power at the valve but water still does not pass through, the valve is likely the cause.
This is a 24-volt solenoid valve rated at 2.3 watts and 60 Hz. It is engineered for humidifier water control applications using a 24V control circuit.
Installation is a straightforward repair. Typical steps include shutting off power to the humidifier, closing the water supply, disconnecting the two low-voltage wires, removing the inlet and outlet water connections, swapping the valve, and restoring power and water. You will need a screwdriver and two wrenches or adjustable pliers. The process generally takes about 20 to 45 minutes.
Before replacing the valve, verify that the humidifier is sending 24V to the solenoid during a call for humidity. Additionally, check for a clogged inlet strainer, kinked water line, blocked orifice, mineral buildup, a plugged evaporator pad, or a saddle valve with restricted flow. Hard water scale and sediment are common reasons these valves stop passing water even when the coil is energized.