Rheem R802VA07542117MSA Error Code A047_F: Inducer Fan 5 Minute Lockout
What Does Code A047_F Mean?
Fault code A047_F on the Rheem R802VA is the alarm-level version of the inducer fan lockout. While T047_F is a single troubleshooting event, A047_F indicates a more persistent inducer pressure problem that has triggered an alarm-level response.
The inducer (draft) motor creates the vacuum needed to safely vent combustion gases out of your home. The pressure switch monitors this vacuum and must close before the control board will allow ignition. When the inducer cannot build sufficient pressure repeatedly, the control board escalates from a troubleshooting fault to this alarm code.
A blocked exhaust vent is the most common cause a homeowner can address. However, A047_F often points to component-level issues: a failing inducer motor that can no longer generate adequate draft, or a defective pressure switch that requires higher-than-normal vacuum to close.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Blocked exhaust vent pipe | Most common | ✓ DIY fix → |
| Failing inducer draft motor | Common | ✗ Call a pro → |
| Defective pressure switch | Common | ✗ Call a pro → |
How to Fix It: Check the Exhaust Vent for Blockages
What You'll Need
Steps
- Turn off power at the breaker or power switch AND shut off the gas supply valve Locate the furnace circuit breaker and flip it to OFF. Turn the gas shutoff valve to the OFF position (perpendicular to the pipe). If you smell gas, leave immediately and call your gas company.
- Inspect the exhaust vent outside your home Go outside and find the furnace exhaust vent pipe. Check for blockages: ice buildup, animal nests, leaves, or debris. Clear any obstructions you can safely reach.
- Check the combustion air intake pipe If your furnace has a separate intake pipe, inspect it for blockages as well. Both pipes must be clear for the inducer to build proper draft.
- Restore power and gas, then test Turn the gas supply valve to ON and flip the circuit breaker to ON. Set your thermostat to call for heat. Listen for the inducer motor to start, then listen for the pressure switch click. If the furnace lights, monitor for several cycles.
When to Call a Professional
Contact a licensed HVAC technician if:
- The exhaust vent is clear but the A047_F fault persists
- The inducer motor sounds weak, labored, or makes unusual noises
- You can hear the inducer running but the furnace never proceeds to ignition
- The problem started suddenly without any weather-related vent issues
- The furnace cycles between T047_F and A047_F repeatedly
Sources
✓ Verified against manufacturer service manual — March 2026