Aprilaire 4981 Circuit Board
The Aprilaire 4981 Circuit Board is a critical OEM replacement part engineered specifically for Aprilaire 800 and Aprilaire 865 steam humidifiers manufactured before November 2014. As an internal control circuit board, this component acts as the "brain" of your humidification system, managing the 24V power distribution from the humidifier transformer and regulating the electrode steam canister’s operation. If your unit’s green power LED fails to illuminate despite having correct line voltage, a faulty humidifier control board is often the primary culprit. This genuine Aprilaire 4981 ensures precise humidity levels are maintained while protecting your equipment from electrical surges that can occur during high-demand cycles. Designed for a direct-fit installation, this board restores the factory-spec communication between your humidistat and the steam generator, helping to eliminate error codes and performance drops in residential or commercial settings.
Key Benefits:- Direct OEM Replacement: Guaranteed compatibility with pre-2014 Aprilaire 800 and 865 series steam units.
- System Protection: Integrated circuitry safeguards the humidifier against electrical fluctuations and surges.
- Precise Humidity Control: Manages the steam production cycles for consistent indoor air quality.
- Diagnostic Support: Features onboard LED indicators to assist in rapid troubleshooting of power issues.
- How do I know if my board is bad? If the green "On/Off" light stays off while 24V power is confirmed at the transformer terminals, the board likely requires replacement.
- Will this work on newer Aprilaire 800 models? No, this specific part is designed only for units manufactured prior to November 2014; later models require a different control assembly.
- Can I install this myself? While designed for a direct fit, installation involves handling line voltage and 24V wiring; sensitive electronic components should be handled with care to avoid static damage.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
This item is not eligible for free shipping.
Original: $286.05
-65%$286.05
$100.12Aprilaire 4981 Circuit Board
The Aprilaire 4981 Circuit Board is a critical OEM replacement part engineered specifically for Aprilaire 800 and Aprilaire 865 steam humidifiers manufactured before November 2014. As an internal control circuit board, this component acts as the "brain" of your humidification system, managing the 24V power distribution from the humidifier transformer and regulating the electrode steam canister’s operation. If your unit’s green power LED fails to illuminate despite having correct line voltage, a faulty humidifier control board is often the primary culprit. This genuine Aprilaire 4981 ensures precise humidity levels are maintained while protecting your equipment from electrical surges that can occur during high-demand cycles. Designed for a direct-fit installation, this board restores the factory-spec communication between your humidistat and the steam generator, helping to eliminate error codes and performance drops in residential or commercial settings.
Key Benefits:- Direct OEM Replacement: Guaranteed compatibility with pre-2014 Aprilaire 800 and 865 series steam units.
- System Protection: Integrated circuitry safeguards the humidifier against electrical fluctuations and surges.
- Precise Humidity Control: Manages the steam production cycles for consistent indoor air quality.
- Diagnostic Support: Features onboard LED indicators to assist in rapid troubleshooting of power issues.
- How do I know if my board is bad? If the green "On/Off" light stays off while 24V power is confirmed at the transformer terminals, the board likely requires replacement.
- Will this work on newer Aprilaire 800 models? No, this specific part is designed only for units manufactured prior to November 2014; later models require a different control assembly.
- Can I install this myself? While designed for a direct fit, installation involves handling line voltage and 24V wiring; sensitive electronic components should be handled with care to avoid static damage.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
This item is not eligible for free shipping.
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Description
The Aprilaire 4981 Circuit Board is a critical OEM replacement part engineered specifically for Aprilaire 800 and Aprilaire 865 steam humidifiers manufactured before November 2014. As an internal control circuit board, this component acts as the "brain" of your humidification system, managing the 24V power distribution from the humidifier transformer and regulating the electrode steam canister’s operation. If your unit’s green power LED fails to illuminate despite having correct line voltage, a faulty humidifier control board is often the primary culprit. This genuine Aprilaire 4981 ensures precise humidity levels are maintained while protecting your equipment from electrical surges that can occur during high-demand cycles. Designed for a direct-fit installation, this board restores the factory-spec communication between your humidistat and the steam generator, helping to eliminate error codes and performance drops in residential or commercial settings.
Key Benefits:- Direct OEM Replacement: Guaranteed compatibility with pre-2014 Aprilaire 800 and 865 series steam units.
- System Protection: Integrated circuitry safeguards the humidifier against electrical fluctuations and surges.
- Precise Humidity Control: Manages the steam production cycles for consistent indoor air quality.
- Diagnostic Support: Features onboard LED indicators to assist in rapid troubleshooting of power issues.
- How do I know if my board is bad? If the green "On/Off" light stays off while 24V power is confirmed at the transformer terminals, the board likely requires replacement.
- Will this work on newer Aprilaire 800 models? No, this specific part is designed only for units manufactured prior to November 2014; later models require a different control assembly.
- Can I install this myself? While designed for a direct fit, installation involves handling line voltage and 24V wiring; sensitive electronic components should be handled with care to avoid static damage.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
This item is not eligible for free shipping.
