Pr Incorrect polarity of L1/L2

What the control is telling you

The control detects that line (black) and neutral (white) on the 115 V supply are reversed, or ground is not reliable.

Applies to: Midea BGH96M 96% AFUE two-stage gas furnaces (060B3A, 080B3A, 080C4A, 100C5A, 100D5A, 120D5A)

Likely causes

• Black and white supply wires swapped at the junction box
• Poor or missing ground connection to the furnace

Test and repair steps

1. Warning: Turn off power at the disconnect before touching line-voltage wiring.
2. Check the field-supplied 115 V wiring in the furnace junction box: black (line) and white (neutral) must match the wiring diagram (Figure 23).
3. Swap the black and white supply conductors if reversed.
4. Confirm the supply ground wire is properly and securely bonded to the furnace.
5. Restore power and confirm Pr has cleared.

Models that show this code

6 models in Midea 96% AFUE A2L Gas Furnace (BGH96M)

Other codes on the same units

• E6 Limit/rollout switch open more than 5 minutes
• E7 System lockout - failed ignition
• E8 System lockout - too many flame dropouts
• LED2 green 1 flash Refrigerant leak sensor communication failure
• LED2 green 2 flashes Refrigerant concentration above alarm limit (leak)
• LED2 green 3 flashes Sensor connected but SW1-2 OFF (DIP reminder)
• LED2 green 4 flashes Refrigerant sensor expired or faulty
• FL Low flame signal