The Lennox 18G90 Pilot Assembly Hvac Replacement Part is a Lennox hvac replacement part for HVAC repair and replacement work. Use it when the part number 18G90 and the listed specifications match the equipment being serviced.

18G90 is an official OEM Pilot Assembly for Lennox HVAC equipment.

Key Specs

• Product Type: Hvac Replacement Part

Fitment Notes

Captured equipment fit data references models including 78RGF3-50-1, 78RGF3-50-2, 78RGF3-75-1, 78RGF3-75-2, 78RGF4-100-1, 78RGF4-100-2, 78RGF4-125-1, 78RGF4-125-2, 78RGF5-100-1, 78RGF5-100-2, 78RGF5-125-1, 78RGF5-125-2. Verify the complete unit model and service manual before installation.

Expert Verdict

Reviewed by the SuperArbor Pro Desk: choose this part when the existing component label and unit documentation match 18G90 and the spec set above. It is best suited for targeted HVAC service repairs where exact fitment matters more than broad universal compatibility.

FAQs

What is the Lennox 18G90 used for?

It is a hvac replacement part for compatible Lennox HVAC equipment. Match the part number 18G90 and the equipment service literature before ordering or installing.

Which specs should I verify before purchase?

Verify the spec set shown for this part: Product Type: Hvac Replacement Part. The replacement should match the existing component and the unit documentation.

How do I confirm this is the right replacement?

Compare the part number 18G90, the hvac replacement part description, and any unit model references with the original component and the service manual.

Which equipment models are referenced in the fit data?

Captured fit data references models such as 78RGF3-50-1, 78RGF3-50-2, 78RGF3-75-1, 78RGF3-75-2, 78RGF4-100-1, 78RGF4-100-2. Treat this as a fitment aid and verify the complete model list in the equipment documentation.

Who should install this HVAC component?

A qualified HVAC technician should install and test the hvac replacement part. Disconnect power first, follow lockout procedures, and confirm safe operation after replacement.

Safety and Installation Notes

Disconnect power before service. HVAC electrical and combustion-related components should be installed and tested by a qualified technician. After installation, confirm wiring, mounting, airflow or fluid routing as applicable, and normal system operation.