The Payne PG9MAA036080AFKA is an 80,000 BTU, 96% AFUE two-stage condensing gas furnace sharing its platform with the Carrier 58MXA. At 96% efficiency the PG9MAA036080AFKA extracts latent heat from flue gases through a secondary heat exchanger, producing acidic condensate that must drain through a trap. The two-stage gas valve runs in low fire at reduced capacity during mild weather and escalates to full output during the coldest conditions. Repair Clinic stocks genuine Payne OEM parts for the PG9MAA036080AFKA and related PG9MAA036060 and PG9MAB036080 variants including the two-stage inducer assembly, pressure switches, control board, condensate trap, and igniter. Browse the Payne furnace parts catalog filtered by PG9MAA036080AFKA for the complete parts inventory.
PG9MAA036080AFKA: High-Efficiency Two-Stage Condensing Furnace Service
The PG9MAA036080AFKA requires a fundamentally different diagnostic approach than an 80% single-stage furnace. A blocked condensate drain is the most common cause of pressure switch faults on any condensing model. The two-stage inducer runs at different speeds for low fire and high fire, and each speed has its own pressure switch verification. A switch fault that occurs only in one firing rate is specific to that inducer speed range. The PG9MAA036080AFKA shares its Carrier 58MXA platform documentation, and Carrier furnace troubleshooting fault code information applies directly to the PG9MAA platform.
Most Replaced Parts on the Payne PG9MAA036080AFKA
Condensate Trap Assembly
The PG9MAA036080AFKA secondary heat exchanger generates acidic condensate at a rate that increases with heating demand. The condensate trap must drain freely at all times. Algae growth and debris in the trap cause the majority of pressure switch fault calls on this condensing model. Annual flushing of the trap with clean water at the beginning of the heating season prevents most PG9MAA036080AFKA pressure switch service calls and costs nothing.
PG9MAA036080 Inducer Motor Assembly
The PG9MAA036080AFKA inducer operates at variable speed to match the draft requirements of both low-fire and high-fire stages. An inducer that cannot transition to high-fire speed limits the furnace to low-fire operation continuously — a symptom that presents as inadequate heating on cold days rather than a complete no-heat fault. The OEM Payne inducer for this model is calibrated for correct draft at both operating speeds.
Pressure Switch Assembly
The PG9MAA036080AFKA uses either a dual-port pressure switch or two separate switches to verify draft at low-fire and high-fire inducer speeds. A fault in only one stage confirms the problem is specific to that operating point. Condensate drain blockage should always be ruled out first — it is the most common cause of pressure switch faults on any condensing furnace platform.
PG9MAA036080 Control Board
The PG9MAA036080AFKA control board manages two-stage gas valve sequencing, inducer speed commands, and condensate system monitoring. It is not interchangeable with single-stage Payne boards. Reading the specific LED blink code before ordering a replacement board often reveals that the fault is in a pressure switch or sensor being reported by the board, not the board itself.
PG9MAA036080 Hot Surface Igniter
The PG9MAA036080AFKA igniter functions the same way as any residential gas furnace igniter regardless of the model’s two-stage complexity or condensing operation. Test resistance across the igniter terminals at room temperature with power off. Infinite resistance confirms an open-circuit failure. Replace with the OEM Payne component specified for this model’s ignition module interface.
Payne PG9MAA036080AFKA Parts at Repair Clinic
- OEM Payne parts for the PG9MAA036080AFKA, PG9MAA036060, and PG9MAB036080 condensing two-stage variants — Payne furnace parts catalog
- Cross-reference to Carrier 58MXA components where parts are confirmed interchangeable; Carrier furnace troubleshooting documentation applies to this platform
- Condensate drain cleaning guides and high-efficiency furnace pressure switch diagnosis in service notes
- 365-day returns on uninstalled parts with no restocking fees
Payne PG9MAA036080AFKA Furnace Parts FAQ
Is the Payne PG9MAA036080AFKA the same as the Carrier 58MXA?
The Payne PG9MAA and Carrier 58MXA share the same high-efficiency condensing platform. Payne is Carrier’s value-tier residential brand. Many service components are interchangeable between the two designations, but always confirm part numbers from the specific model data plate before ordering.
What is the PG9MAA036080AFKA efficiency rating and BTU output?
The PG9MAA036080AFKA achieves 96% AFUE efficiency at 80,000 BTU input, delivering approximately 76,800 BTU of usable heat output per hour. At 96% AFUE this furnace is a condensing model requiring PVC plastic venting and a condensate drain, not metal B-vent.
Why does my PG9MAA036080AFKA produce condensate during operation?
Condensate production is normal and expected on the PG9MAA036080AFKA. The secondary heat exchanger cools flue gases below the dew point, converting water vapor to acidic liquid that drains through the condensate trap. A condensate drain that is blocked or improperly sloped is the most common cause of pressure switch faults on this model.
My PG9MAA036080AFKA operates only in low fire even during extreme cold. What should I check?
Continuous low-fire operation during peak heating demand usually indicates the high-stage pressure switch cannot close at high-fire inducer speed, a high-fire gas valve solenoid fault, or a control board that is not commanding the high-fire stage. Read the board fault code to identify which stage is failing.
