Keep your Lennox ML193UH045P24B-1 furnace running efficiently with genuine OEM replacement parts from Repair Clinic. The ML193UH045P24B-1 is a 45,000 BTU input, 93% AFUE two-stage condensing gas furnace from Lennox’s ML series. At 45,000 BTU this is the smallest output configuration in the ML193 condensing line, designed for well-insulated smaller homes where the higher-output configurations would exceed the heating load. The ML193 condensing platform requires PVC venting, produces acidic condensate during normal operation, and uses a condensing-rated inducer motor that must never be substituted with a standard 80% AFUE inducer. Repair Clinic stocks genuine Lennox OEM parts for the ML193UH045P24B-1 including the Lennox igniter parts, Lennox flame sensor parts, Lennox draft inducer motor parts, Lennox pressure switch parts, and Lennox control board parts. Browse the Lennox furnace parts catalog filtered by ML193UH045P24B-1 for the complete parts inventory.
ML193UH045P24B-1: Lennox ML193 45,000 BTU Two-Stage Condensing Furnace Service
The Lennox ML193UH045P24B-1 at 45,000 BTU and ML193UH070P24B-1 at 70,000 BTU share the same ML193 two-stage condensing platform but use inducer motors sized for their respective output classes. The condensate trap is the most important annual maintenance item on the ML193UH045P24B-1. Flushing the condensate trap before the heating season prevents the algae growth that causes most early-season pressure switch faults on this condensing platform. The Lennox furnace troubleshooting guide covers fault code blink patterns for the Lennox ML193 platform control board.
Most Replaced Parts on the Lennox ML193UH045P24B-1
Condensate Trap for the ML193UH045P24B-1
Annual flushing of the condensate trap at the beginning of the heating season is the single most cost-effective preventive maintenance step for the ML193UH045P24B-1. Algae growth in the trap during warm months causes most pressure switch fault calls at heating season startup on the ML193 condensing platform.
Lennox ML193UH045P24B-1 Draft Inducer Motor
The condensing-rated inducer on the ML193UH045P24B-1 is sized for 45,000 BTU combustion gas throughput. It must tolerate moisture from condensate-laden flue gases and must not be substituted with a standard 80% AFUE inducer or an inducer from the higher-output ML193UH070P24B-1. Bearing failure presents as grinding at startup during the pre-purge phase.
Pressure Switch for the ML193UH045P24B-1
Inspect and flush the condensate drain trap before replacing the pressure switch on any condensing furnace. The vast majority of ML193UH045P24B-1 pressure switch fault calls trace to a blocked condensate drain rather than a failed switch diaphragm.
Hot Surface Igniter for the ML193UH045P24B-1
Testing igniter resistance at room temperature with power off confirms failure in under two minutes. An infinite ohm reading means the element is open-circuit and must be replaced.
ML193UH045P24B-1 Control Board
The ML193UH045P24B-1 control board manages two-stage gas valve operation, inducer pre-purge timing, and condensate monitoring. Read and document the LED fault code before ordering any replacement component.
Why Choose Repair Clinic for Lennox ML193UH045P24B-1 Parts
- Genuine Lennox ML193 OEM Components: Condensing-rated inducers, pressure switch assemblies, and control boards confirmed for the ML193UH045P24B-1 45,000 BTU platform Lennox furnace parts.
- 045 vs 070 Output Differentiation: The ML193UH045P24B-1 and ML193UH070P24B-1 inducer motors are catalogued separately by output class to prevent cross-substitution between the two configurations.
- Condensate System Priority: Annual drain trap flushing guides prevent the most common ML193UH045P24B-1 pressure switch fault from recurring at heating season startup.
- 365-Day Returns: Return any uninstalled Lennox part within a full year of purchase with no restocking fees.
Lennox ML193UH045P24B-1 Furnace Parts FAQ
What is the BTU output and efficiency of the Lennox ML193UH045P24B-1?
The ML193UH045P24B-1 is a 45,000 BTU input, 93% AFUE two-stage condensing gas furnace from Lennox’s ML series. The 045 identifies 45,000 BTU capacity and the 93 in the ML193 designation identifies 93% AFUE efficiency on the ML series condensing platform.
What type of venting does the Lennox ML193UH045P24B-1 require?
The ML193UH045P24B-1 is a 93% AFUE condensing furnace requiring Schedule 40 PVC venting for both exhaust and combustion air intake. Metal B-vent is not appropriate for this condensing model because it cannot tolerate the acidic condensate that forms in the flue gases.
Why does my ML193UH045P24B-1 produce a pressure switch fault at the start of the season?
Early-season pressure switch faults on the ML193UH045P24B-1 are almost always caused by algae growth in the condensate trap during warm months when the furnace was idle. Flush the condensate trap with clean water before the first heating call each season to prevent this recurring fault.
Is the Lennox ML193UH045P24B-1 the same as the ML193UH070P24B-1?
The ML193UH045P24B-1 delivers 45,000 BTU while the ML193UH070P24B-1 delivers 70,000 BTU on the same ML193 two-stage condensing platform. The inducer motor is sized for each output class and must not be cross-substituted between the 045 and 070 configurations.
