Rheem / Ruud Furnace Error Codes
Complete list of Rheem / Ruud furnace error codes with causes and how to fix them.
1_FLASH
🔴
Rheem / Ruud Furnace error code 1_flash: System lockout (ignition failure).
Technician Required
10_FLASH
🔴
Rheem / Ruud Furnace error code 10_flash: Ignition lockout after 3 attempts.
Technician Required
2_FLASH
🟡
Rheem / Ruud Furnace error code 2_flash: Pressure switch stuck closed.
Technician Required
3_FLASH
🟡
Rheem / Ruud Furnace error code 3_flash: Pressure switch stuck open.
Technician Required
4_FLASH
🟡
Rheem / Ruud Furnace error code 4_flash: Open high limit device.
Technician Required
5_FLASH
🔴
Rheem / Ruud Furnace error code 5_flash: Flame sensed without call for heat.
Technician Required
6_FLASH
🟡
Rheem / Ruud Furnace error code 6_flash: 115V power reversed / polarity.
Technician Required
7_FLASH
🔴
Rheem / Ruud Furnace error code 7_flash: Low flame sense current.
Technician Required
8_FLASH
🟡
Rheem / Ruud Furnace error code 8_flash: Low inducer speed.
Technician Required
9_FLASH
🔴
Rheem / Ruud Furnace error code 9_flash: Rollout switch open.
Technician Required
E1
🟡
Rheem / Ruud Furnace error code E1: Communication failure.
Technician Required
E2
🔴
Rheem / Ruud Furnace error code E2: High pressure fault.
Technician Required
E3
🔴
Rheem / Ruud Furnace error code E3: Low pressure fault.
Technician Required
E4
🟡
Rheem / Ruud Furnace error code E4: Discharge temperature protection.
Technician Required
E5
🟢
Rheem / Ruud Furnace error code E5: Ambient temperature sensor failure.
✓ DIY Possible
E6
🟢
Rheem / Ruud Furnace error code E6: Discharge pipe sensor failure.
✓ DIY Possible
E7
🟢
Rheem / Ruud Furnace error code E7: Defrost sensor failure.
✓ DIY Possible