Trane Control Board or Relay Malfunction

Furnace cycles on and off with loud clicking from control area, but burners do not stay lit

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

Failing integrated furnace control board, Loose low-voltage connections, Shorted thermostat wires, Intermittent safety switch contacts

Safety: Turn off power before accessing the control compartment.

Steps to check:

Inspect wiring: Check all low-voltage connections at the Trane control board for tightness and corrosion.
Check thermostat cable: Look for damaged thermostat wires that may be shorting.
Observe LED codes: Note any fault codes that appear during clicking episodes.

When to call a professional: Rapid relay cycling often indicates a failing control board, which should be replaced by a technician.

Hard 4/5

Integrated Furnace Control Board

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