Rheem R802VA07542117MSA Error Code T047_F: Inducer Fan 5 Minute Lockout

What Does Code T047_F Mean?

Code T047_F on the Rheem R802V is a low-severity, troubleshooting-level 5-minute soft lockout of the inducer fan. Before the burners can light, the inducer (draft) motor must build enough negative pressure to close the inducer pressure switch, which proves the furnace is venting. If the switch does not close within the required time during the pre-purge cycle, the Bluetooth Communicating IFC backs off for 5 minutes and then retries automatically. It is marked low severity precisely because it is designed to self-clear.

On this two-stage furnace the inducer has to prove venting on every heat call, and small, temporary things can keep the switch from closing in time: a gust of wind blowing back into the exhaust termination, a brief cap of snow or ice, or a bit of debris momentarily at the outside opening. Those are the homeowner-safe causes, and clearing the outside vent or intake termination usually resolves a repeating T047_F. A slowly starting or worn inducer motor, or a partially blocked pressure switch hose, produce the same lockout but are professional work.

T047_F is one of a small family of inducer lockout codes on this board. Code-A047_F is the alarm-level, persistent counterpart of this same 5-minute lockout, raised when the problem does not clear on its own. Code-T045_F describes the specific condition where the low-stage inducer pressure switch fails to close after 60 seconds of inducer run, which is the underlying mechanism that most often drives this lockout.

What You'll Notice

• The furnace pauses for about 5 minutes and then restarts on its own
• The inducer/draft motor runs but ignition is delayed
• The control's blinking LED flashes the T047_F code, or it appears in the Bluetooth contractor app
• It happens once during windy or snowy weather and then clears
• No warm air during the short lockout window

Common Causes

How This Is Diagnosed

A single T047_F is usually treated as a transient event and no part is condemned. If it repeats, the outside vent and intake terminations are checked first as the only homeowner-safe cause, and then a technician evaluates whether the inducer motor starts and comes up to draft promptly and whether the pressure switch hose is partially restricted.

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. They are commonly a pair of pipes or a concentric fitting.
3. Inspect for wind-blown debris, snow, ice, and nests Shine a flashlight into and around each termination. Because a single T047_F is often caused by a momentary blockage, look for anything that could briefly choke the draft: drifting snow, a rim of ice, leaves, or insect and bird nests.
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, pressure switch, or hoses inside the furnace; that work is for a technician.
5. Restore power and gas and monitor Turn the gas valve to ON and restore power. The 5-minute lockout expires on its own. Set the thermostat to call for heat and watch whether the furnace starts normally, with the inducer running, the pressure switch clicking closed, and the burners lighting.

When to Call a Professional

Contact a licensed HVAC technician if:

• T047_F keeps recurring instead of clearing after a retry
• It escalates to the alarm-level code-A047_F
• The inducer motor sounds weak, slow to start, or noisy
• The outside vent and intake are clear but the lockout continues
• Any inducer motor, pressure switch, or hose service is needed

✓ Verified against manufacturer service manual — March 2026