How to Diagnose Furnace Problems & Why the Red Light Is Blinking

Rheem Furnace Led Codes. Rheem Furnace Error Codes What Do They Mean? HVAC BOSS 4 Blinks = Pressure Switch Failure (remains closed) 5 Blinks = Twinning Circuit Failure * *Only applies to boards with twinning feature. Unlike many other furnaces, Rheem ones don't use flashing LED light sequences to indicate errors, and the display will instead give you a simple code you can use for diagnostics

1 Blink = Soft Lockout (1 hour) 2 Blinks = Pressure Switch Failure (remains open) 3 Blinks = Limit Switch Open For instance, a steady green light typically means the furnace is functioning correctly

Gas furnace fault or error codes for common furnaces Gray Furnaceman

1 Blink = Soft Lockout (1 hour) 2 Blinks = Pressure Switch Failure (remains open) 3 Blinks = Limit Switch Open Some Rheem models — particularly newer furnaces — have an integrated furnace control inside them that flashes a warning LED light when there is a problem with operation 1 Blink = Soft Lockout (1 hour) 2 Blinks = Pressure Switch Failure (remains open) 3 Blinks = Limit Switch Open

Rheem Furnace Code 57 Darin Smalls. See Also Do All Furnaces Have Filters: Discovering the Importance and Maintenance Needed for Your System For instance, 0 means the unit is in standby, while H means the heat is on.

Rheem Furnace Code 57 Darin Smalls. We will explain both methods below in their respective sections. Draft issues: The furnace may be experiencing problems with airflow, which could be due to a blocked flue or a malfunctioning draft inducer motor.