Field Controls Humidifier Replacement Parts

Field Controls humidifier replacement parts are the OEM-specified components used to service and restore Field Controls S2000 and S2020 whole-house steam humidifiers. The S2000 outputs up to 16 gallons of water per day, and the S2020 outputs up to 23 gallons per day, so when a part fails on either unit, the right replacement matters. Field Controls humidifier replacement parts include the complete service parts library: circuit boards, solenoid valves, thermistors, water level probes, drain valves, zinc anodes, tank baffles, heater assemblies, insulation kits, and mounting hardware. For any contractor or technician keeping a steam humidifier running through the heating season, knowing the correct part number before opening the unit saves a trip back to the shop.

Field Controls steam humidifiers are compatible with all makes and models of forced-air heating systems, which means they show up in a wide range of residential installs. Having the right replacement part on the truck, matched to the specific model, is what separates a clean one-call repair from a callback.

KEY SUBCATEGORIES / PRODUCT TYPES

Circuit Boards (Models 2010 and 2011)

The Field Controls Model 2010 is the 120V circuit board assembly for the S2000 steam humidifier, and the Model 2011 (part number 094021A0207) is the 220V circuit board assembly for the S2020. The circuit board controls all operational functions, including the fill cycle, heater activation, automatic flush sequence, and the LED service indicators that communicate unit status. When the board fails, the humidifier stops responding to humidity calls or gets stuck in an error state. Replacing the board with the correct voltage-matched assembly, 2010 for 120V installs and 2011 for 220V, restores full operation without replacing the entire unit.

Solenoid Valve Assembly (Model 2001)

The Field Controls Model 2001 is the 24V solenoid valve assembly (part number 094021A0203) that controls water fill on both the S2000 and S2020. When the humidistat calls for humidity, the solenoid valve opens to allow water into the tank. A failed solenoid valve either leaves the tank empty, preventing steam production, or sticks open and causes overfill. The Model 2001 is a direct replacement for both S2000 and S2020 units. Field Controls provides dedicated installation instructions for the 2001 water fill valve replacement to confirm proper wiring and connection.

Zinc Anode (Z100, Part Number 94021A0211)

The Field Controls Z100 zinc anode acts as a sacrificial metal inside the steam humidifier tank. Minerals and chemicals in the water attach to the Z100 rather than attacking the stainless steel components. Without an active anode, scale buildup on tank components accelerates. Field Controls recommends replacing the Z100 on a yearly maintenance cycle. The Z100 mounts to the tank baffle and is accessible during the annual cleaning procedure. Running the unit without a functioning anode can degrade tank performance over time.

Drain Valve Assembly (Model 2006)

The Field Controls Model 2006 is the drain valve assembly (part number 094021A0208) responsible for the S2000 and S2020 automatic flush function. The units flush automatically every 24 hours of operation to keep water fresh and the pan clean. A failed drain valve can prevent the flush cycle from completing, leading to stagnant water and scale accumulation in the tank. Field Controls publishes dedicated installation instructions for the 2006 automatic drain assembly. Correct reassembly requires teflon tape on the brass threads and tightening with an adjustable wrench at the brass fitting rather than using the solenoid body as leverage.

Water Level Probe Assembly (Model 2003)

The Field Controls Model 2003 water level probe assembly (part number 094021A0204) monitors the water level inside the tank and signals the circuit board to close the fill valve when the correct level is reached. A failed probe can result in the unit either continuously filling or never triggering the heater cycle. The Model 2003 is compatible with both the S2000 and S2020. Field Controls provides replacement instructions specific to the 2003 probe assembly to confirm correct installation depth and board connection, as subtle differences between probe assemblies can affect operation if the wrong part is installed.

BUYING GUIDE / HOW TO CHOOSE

When specifying Field Controls humidifier replacement parts, starting with the correct humidifier model number is the non-negotiable first step. The S2000 operates on 120V and the S2020 operates on 220V, and several key components, including the heater assemblies and circuit boards, are voltage-specific and not interchangeable between the two models. The Model 2010 circuit board is for the S2000; the Model 2011 board is for the S2020. Ordering the wrong one means pulling the unit again.

For annual maintenance on Field Controls steam humidifiers, the Z100 zinc anode is a standard service item. Running the unit through a full heating season without replacing the anode can accelerate scale buildup on the stainless steel tank interior. The anode removal and reinstallation is part of the documented annual cleaning procedure and doesn't require removing the entire unit from the duct.

When diagnosing a Field Controls steam humidifier that isn't producing humidity, the LED service indicators on the circuit board narrow down the failing component before any parts are ordered. A unit stuck on the "FILL" state with water not reaching probe level points to the Model 2003 water level probe or the Model 2001 solenoid valve. A unit that fills but never activates the blower may indicate a Model 2002 thermistor issue, since the thermistor signals the board when water reaches 170°F.

For contractors looking at how to choose between the IDB internal duct bracket and the UDB under-duct bracket, the application determines the hardware. The IDB fits inside the duct opening for standard through-duct mounting, while the UDB is designed for under-duct installation and makes annual removal for cleaning significantly faster. Either mounting bracket is compatible with both the S2000 and S2020.

If a Field Controls S2000 or S2020 unit shows the thermal cut-off assembly tripping, the correct replacement part depends on the date code of the unit. Units with date code 1545 or newer require the specific thermal cut-off assembly for that revision. Confirming the unit's date code before ordering the thermal cut-off (SKU: 46645200) prevents a mismatch on a part that's cheap but critical to safe operation.

FAQs

What's the difference between the Field Controls 2010 and 2011 circuit boards?

The difference between the Field Controls Model 2010 and Model 2011 circuit boards is voltage. The Model 2010 (part number 094021A0206) is the 120V circuit board assembly for the S2000 steam humidifier, and the Model 2011 (part number 094021A0207) is the 220V circuit board assembly for the S2020. The two boards aren't interchangeable, so confirming the humidifier model before ordering is the right first step. Installing the incorrect board assembly may result in the unit failing to operate correctly.

How often should the Field Controls Z100 zinc anode be replaced?

The Field Controls Z100 zinc anode is a sacrificial component that should be replaced on a yearly maintenance cycle. The Z100 acts as a sacrificial metal, attracting minerals and chemicals from the water so they don't attack the stainless steel components inside the tank. An anode that has fully degraded can no longer protect the tank interior, which may allow scale buildup to accelerate. The Z100 mounts to the tank baffle plate and is accessible during the annual cleaning procedure without full unit removal.

Which Field Controls humidifier replacement parts work with both the S2000 and S2020?

Several Field Controls replacement parts are compatible with both the S2000 and S2020 steam humidifiers, including the Model 2001 solenoid valve assembly (094021A0203), the Model 2003 water level probe assembly (094021A0204), the Model 2006 drain valve assembly (094021A0208), the Model 2007 tank baffle (094021A0209), and the Z100 zinc anode. Voltage-specific components, including the heater assemblies and circuit boards (Model 2010 for the S2000, Model 2011 for the S2020), are not shared between the two models. Always confirm the model and voltage before ordering any circuit board or heater assembly.

What causes a Field Controls S2000 or S2020 to stop filling with water?

A Field Controls S2000 or S2020 that stops filling with water most often points to either the Model 2001 solenoid valve assembly or the Model 2003 water level probe assembly. The solenoid valve opens on a humidity call to allow water into the tank, and a failed valve may not open at all. The water level probe signals the circuit board when the correct fill level is reached. If the probe sends a false "full" signal, the solenoid may close before the tank actually fills. Field Controls provides dedicated installation instructions for both the 2001 and 2003 replacements to confirm correct wiring and probe depth.

What is the Field Controls Model 2002 thermistor and when does it need replacement?

The Field Controls Model 2002 thermistor probe assembly (part number 094021A0205) monitors water temperature inside the steam humidifier tank and signals the circuit board when the water reaches 170°F, which triggers the blower to activate. A failed thermistor may result in the unit filling with water but never advancing to the steam production stage, since the board can't confirm the water is hot enough to operate the system blower. The Model 2002 is compatible with both the S2000 and S2020 steam humidifiers. Field Controls publishes specific replacement instructions for the 2002 thermistor probe assembly.