Rheem R802VA07542117MSA Error Code *T057_F: Inducer Hi Pressure Switch Won't Close (Two-Stage Only)

What Does Code *T057_F Mean?

Code T057_F on the Rheem R802V means that during high-stage operation the high-stage inducer pressure switch failed to close, so the Bluetooth Communicating IFC could not prove adequate high-fire venting. This is a two-stage-only fault, marked with an asterisk in the code list, because a single-stage furnace has no separate high-stage pressure switch to satisfy.

The reason this design produces a distinct high-stage code is that a two-stage furnace uses separate low-stage and high-stage inducer pressure switches, and the inducer (draft) motor must prove venting at whichever fire rate it is running. At high stage the burners consume more gas and the inducer spins faster, so it must build MORE draft to close the high-stage switch. A restriction that low fire tolerates can fail at high fire, which is why a partially blocked exhaust or intake termination outside, from ice, debris, or a nest, often surfaces as T057_F before any low-stage code appears. That outside blockage is the homeowner-safe cause; a weak inducer at high speed or a defective high-stage switch is pro-only.

T057_F contrasts directly with code-T045_F, the low-stage equivalent, which is set when the low-stage inducer pressure switch fails to close after 60 seconds of inducer run. If the furnace proves draft fine on low stage but fails only when stepping up, the restriction or inducer weakness is showing itself preferentially at the higher airflow demand of high fire.

What You'll Notice

• The furnace runs on low heat but fails or shuts down when it steps up to high fire
• The furnace never reaches full heat output on cold days
• The alphanumeric display flashes T057_F digit by digit
• The inducer audibly speeds up for high fire but the burners do not sustain high stage
• A partial blockage or ice at the outside vent termination

Common Causes

How This Is Diagnosed

The outside vent and intake terminations are inspected first, because a partial restriction is the most common homeowner-safe cause and shows up at high fire before low fire. If the terminations are clear, a technician verifies whether the inducer reaches full high-stage speed and builds adequate high-fire draft, then tests the high-stage pressure switch and its hose.

How to Fix It: Clear the Outside Exhaust and Intake Vent Terminations

What You'll Need

• Flashlight
• Work gloves

Steps

1. Turn off electrical power at the breaker or switch AND shut off the gas supply Flip the furnace circuit breaker to OFF, or use the dedicated power switch on or near the furnace, then turn the manual gas shutoff valve to OFF (handle perpendicular to the pipe). If you smell gas, leave immediately and call your gas company. Do not continue until the gas smell is gone.
2. Find the vent and intake terminations outside Go outside and locate where the furnace vents through the wall or roof. Identify the exhaust termination and, if present, the separate combustion-air intake pipe, usually a pair of pipes or a concentric fitting.
3. Inspect for a partial restriction Shine a flashlight into and around each termination. Because high-stage needs more draft, even a partial restriction that low fire tolerates can trigger this code, so look carefully for a partial cap of ice or snow, a partial nest, or debris narrowing the opening.
4. Clear visible obstructions from the outside only Wearing gloves, remove any visible debris, nests, snow, or ice you can reach by hand at the outside opening. Do not push tools deep into the pipe, and do not open or probe the inducer, high-stage pressure switch, or hoses inside the furnace; that work is for a technician.
5. Restore power and gas and trigger a high-stage cycle Turn the gas valve to ON and restore power. Set the thermostat several degrees above room temperature to push the furnace into high fire, then watch whether it runs a full high-stage cycle without faulting. Note that if it only calls for low stage, T057_F may not reappear until high fire is demanded again.

When to Call a Professional

Contact a licensed HVAC technician if:

• The outside vent and intake are clear but the furnace still cannot reach high fire
• The furnace only runs on low heat and will not step up
• The inducer sounds weak or labored at high speed
• A high-stage pressure switch hose is cracked, loose, or disconnected
• Any high-stage pressure switch or inducer motor service is needed

✓ Verified against manufacturer service manual — March 2026