Ruud UGRA-07EMAES Error Code 2 Blinks: Pressure Switch Open
What Does Code 2 Blinks Mean?
The 2-blink status code on the Ruud UGRA-07EMAES indicates the pressure switch circuit is open. The pressure switch is a safety device that confirms the induced draft motor is creating enough negative pressure to safely vent combustion gases out of your home. The furnace will not ignite until this switch closes.
When the pressure switch does not close within 60 seconds after the draft motor starts, the control board shuts off the induced draft motor for 5 minutes and then retries. This cycle repeats until the problem is resolved or the furnace is manually reset.
The most common cause is a blocked or obstructed exhaust vent pipe. Snow, ice, leaves, bird nests, or insect nests can block the vent where it exits your home. A disconnected or cracked pressure switch hose is another common cause. A failing induced draft motor that cannot generate sufficient suction, or a defective pressure switch itself, are less common possibilities.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Blocked vent or flue pipe | Most common | ✗ Call a pro → |
| Faulty pressure switch | Common | ✗ Call a pro → |
| Failed induced draft motor | Uncommon | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- The vent pipes appear clear but the 2-blink code persists
- The draft motor sounds unusually loud, rattles, or does not start at all
- You notice the pressure switch hose is cracked or disconnected
- The code returns intermittently, especially on windy days
✓ Verified against manufacturer service manual — March 2026