York Lockout and Auto-Reset Cycling

Furnace starts and stops repeatedly before reaching temperature; blower may continue to run.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Intermittent flame sensing, Loose wiring connections, Faulty control board, Marginal pressure switch operation

Safety: Turn off power before tightening connections.

Tighten low-voltage connections: Check all screw terminals on the control board (R, W, G, Y, C) and safety circuits. Tighten any loose screws.
Inspect harness plugs: Reseat multi-pin connectors on the board and blower motor.
Clean flame sensor and check tubing: Clean the flame sensor and ensure pressure switch tubing is clear.
Monitor operation: If cycling continues, a technician should check for intermittent board or sensor failures.

Medium 3/5

Integrated Furnace Control Board

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