Lennox Error Code LED#1-Off, LED#2-Off

Possible cause: 1.1.1 Main voltage 120V not supplied to unit. Corresponding action/comments: ACTION 1 − Check 120V main voltage. Determine cause of main power failure. Possible cause: 1.1.2 Miswiring of furnace or improper connections. Corresponding action/comments: ACTION 1 − Check for correct wiring of 120V to power make up box and transformer. ACTION 2 − Check 24V wiring to control board. Possible cause: 1.1.3 Circuit breaker tripped or fails to close. Corresponding action/comments: ACTION 1 − Replace circuit breaker if it is reset but does not have continuity. ACTION 2 − If circuit breaker still trips, check for short. Possible cause: 1.1.4 Door interlock switch failure. Corresponding action/comments: ACTION 1 − Check that door switch is activated when door is closed. ACTION 2 − Check wire connections to switch, re- place loose connectors. ACTION 3 − Check continuity of switch in closed position. Replace if malfunctioning Possible cause: 1.1.5 Transformer Failure. Corresponding action/comments: ACTION 1 − Check that transformer output is 24V. Replace if malfunctioning Possible cause: 1.1.6 Failed control board. Corresponding action/comments: ACTION 1 − If all the above items have been checked, replace board.