Lennox furnace error code flash

The Lennox furnace error code flash is a message that appears when the control board detects a loss of power. The flashing Lennox furnace error code flash means that the power to the system has been lost.

A complete interruption of voltage to the system will result in a flashing Lennox furnace error code flash, but there are other causes for this malfunction. For example, if an overload or short circuit occurs on any of the internal wirings, this will also cause the flashing Lennox furnace error code flash to appear.

Furthermore, if there is an open switch, breaker, or blown a fuse, you may also see a flashing Lennox furnace error code flash.

Lennox is a type of furnace that is often used in residential homes. It has a range of different error codes, from 1 to 6.

The Lennox furnace error code flash is displayed if the furnace detects an abnormality in its operation. This can be anything from a misreading sensor to something more serious like the burners not lighting the gas or insufficient air supply. When this error flashes, you should call a technician to check on your system and fix any problems as soon as possible.

A variety of reasons can cause error codes on a furnace. The most common reason is a dirty filter, which requires the user to replace it with a new one.

Error Codes:

1-1-1 – The outdoor temperature sensor is not functioning or has failed. Check the outdoor temperature sensor and replace it as necessary.

2-2-2 – Indoor Temperature Sensor Faulty, Replace Indoor Temperature Sensor.

4-4-4 – Igniter circuit fault, check for the open circuit at the igniter coil or miswiring in the igniters themselves

5-5-5 – Flame sensing circuit fault; check for voltage across the flame sensor and continuity to downstream components.