Lochinvar & A.O. Smith 100233301 Switch
The Lochinvar & A.O. Smith 100233301 Switch is a critical fixed-setting Normally Open (N.O.) air pressure switch designed for negative pressure sensing applications in high-efficiency venting systems. Calibrated specifically to -1.25" WC, this OEM component serves as a primary safety proving switch, ensuring the combustion blower is generating sufficient draft before the ignition sequence initiates. For veteran technicians, this 100233301 pressure switch is the direct replacement for identifying "low air" or "air proving switch" fault codes on compatible Lochinvar boilers and A.O. Smith water heaters. The diaphragm-actuated mechanism provides precise setpoint reliability, preventing the burner from firing if flue obstructions or inducer motor performance issues are detected. Relying on genuine OEM refrigeration and heating parts like the 100233301 ensures that the safety circuit maintains its factory-specified tolerances, which is vital when troubleshooting condensing water heater ventilation issues in the field.
Key Benefits- Precise Proving: Factory-calibrated to -1.25 in. WC for accurate combustion air verification.
- OEM Compatibility: Exact fit for Lochinvar and A.O. Smith units, eliminating the risks associated with universal "close-enough" alternatives.
- Circuit Integration: Features standard terminals for rapid integration into the existing low-voltage safety string.
- Operational Safety: Prevents hazardous gas buildup by locking out the system if the inducer fan fails to provide adequate negative pressure.
What causes a "Low Air" error code on my boiler?
While the 100233301 switch itself can fail due to a ruptured diaphragm or pitted contacts, "low air" codes are often triggered by external factors. Check for debris in the intake/exhaust venting, cracked or water-logged silicone tubing, or a failing inducer motor before assuming the switch is defective.
How do I test if this switch is functioning?
Disconnect power and use a multimeter to check for continuity across the terminals. As a Normally Open switch, it should show an open circuit at rest and close only when the specified negative pressure of -1.25" WC is applied via the sensing port.
Can I use a universal pressure switch as an alternative?
Using a universal switch is not recommended. The combustion geometry of high-efficiency boilers depends on exact WC setpoints; installing a part with an incorrect trip point can lead to soot accumulation, unstable flames, or dangerous operating conditions.
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.
Original: $41.89
-65%$41.89
$14.66Lochinvar & A.O. Smith 100233301 Switch
The Lochinvar & A.O. Smith 100233301 Switch is a critical fixed-setting Normally Open (N.O.) air pressure switch designed for negative pressure sensing applications in high-efficiency venting systems. Calibrated specifically to -1.25" WC, this OEM component serves as a primary safety proving switch, ensuring the combustion blower is generating sufficient draft before the ignition sequence initiates. For veteran technicians, this 100233301 pressure switch is the direct replacement for identifying "low air" or "air proving switch" fault codes on compatible Lochinvar boilers and A.O. Smith water heaters. The diaphragm-actuated mechanism provides precise setpoint reliability, preventing the burner from firing if flue obstructions or inducer motor performance issues are detected. Relying on genuine OEM refrigeration and heating parts like the 100233301 ensures that the safety circuit maintains its factory-specified tolerances, which is vital when troubleshooting condensing water heater ventilation issues in the field.
Key Benefits- Precise Proving: Factory-calibrated to -1.25 in. WC for accurate combustion air verification.
- OEM Compatibility: Exact fit for Lochinvar and A.O. Smith units, eliminating the risks associated with universal "close-enough" alternatives.
- Circuit Integration: Features standard terminals for rapid integration into the existing low-voltage safety string.
- Operational Safety: Prevents hazardous gas buildup by locking out the system if the inducer fan fails to provide adequate negative pressure.
What causes a "Low Air" error code on my boiler?
While the 100233301 switch itself can fail due to a ruptured diaphragm or pitted contacts, "low air" codes are often triggered by external factors. Check for debris in the intake/exhaust venting, cracked or water-logged silicone tubing, or a failing inducer motor before assuming the switch is defective.
How do I test if this switch is functioning?
Disconnect power and use a multimeter to check for continuity across the terminals. As a Normally Open switch, it should show an open circuit at rest and close only when the specified negative pressure of -1.25" WC is applied via the sensing port.
Can I use a universal pressure switch as an alternative?
Using a universal switch is not recommended. The combustion geometry of high-efficiency boilers depends on exact WC setpoints; installing a part with an incorrect trip point can lead to soot accumulation, unstable flames, or dangerous operating conditions.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Lochinvar & A.O. Smith 100233301 Switch is a critical fixed-setting Normally Open (N.O.) air pressure switch designed for negative pressure sensing applications in high-efficiency venting systems. Calibrated specifically to -1.25" WC, this OEM component serves as a primary safety proving switch, ensuring the combustion blower is generating sufficient draft before the ignition sequence initiates. For veteran technicians, this 100233301 pressure switch is the direct replacement for identifying "low air" or "air proving switch" fault codes on compatible Lochinvar boilers and A.O. Smith water heaters. The diaphragm-actuated mechanism provides precise setpoint reliability, preventing the burner from firing if flue obstructions or inducer motor performance issues are detected. Relying on genuine OEM refrigeration and heating parts like the 100233301 ensures that the safety circuit maintains its factory-specified tolerances, which is vital when troubleshooting condensing water heater ventilation issues in the field.
Key Benefits- Precise Proving: Factory-calibrated to -1.25 in. WC for accurate combustion air verification.
- OEM Compatibility: Exact fit for Lochinvar and A.O. Smith units, eliminating the risks associated with universal "close-enough" alternatives.
- Circuit Integration: Features standard terminals for rapid integration into the existing low-voltage safety string.
- Operational Safety: Prevents hazardous gas buildup by locking out the system if the inducer fan fails to provide adequate negative pressure.
What causes a "Low Air" error code on my boiler?
While the 100233301 switch itself can fail due to a ruptured diaphragm or pitted contacts, "low air" codes are often triggered by external factors. Check for debris in the intake/exhaust venting, cracked or water-logged silicone tubing, or a failing inducer motor before assuming the switch is defective.
How do I test if this switch is functioning?
Disconnect power and use a multimeter to check for continuity across the terminals. As a Normally Open switch, it should show an open circuit at rest and close only when the specified negative pressure of -1.25" WC is applied via the sensing port.
Can I use a universal pressure switch as an alternative?
Using a universal switch is not recommended. The combustion geometry of high-efficiency boilers depends on exact WC setpoints; installing a part with an incorrect trip point can lead to soot accumulation, unstable flames, or dangerous operating conditions.
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.
