Error codes for TRANE furnaces

These error codes apply to Trane gas furnaces only. Error codes for other brands will probably be totally different.
The number of possible codes depends on which generation furnace you have. Typically, the newer the furnace, the more error codes the control will be able to show.



The following tables apply to integrated furnace controls; these boards control all functions of the furnaces, as opposed to igntion-only controls.

Common Integrated Furnace Controls (IFC) :

Flashing Slow Normal - No call for Heat from thermostat
Flashing Fast Normal - Call for Heat from thermostat
Continuous ON Control Board Bad - needs replaced
Continuous OFF Check Power
2 Flashes System Lockout (Retries or Recycles exceeded)
3 Flashes Vent Pressure Switch Error
4 Flashes Open High Temperature Limit Device
5 Flashes Flame sensed when no flame should be present


Flashing Slow Normal - No call for Heat from thermostat
Flashing Fast Normal - Call for Heat from thermostat
Continuous ON Control Board Bad - needs replaced
Continuous OFF Check Power
2 Flashes System Lockout (Retries or Recycles exceeded)
3 Flashes Vent Pressure Switch Error
4 Flashes Open High Temperature Limit Device
5 Flashes Flame sensed when no flame should be present
6 Flashes 115 Volt AC power reversed or Poor Grounding
7 Flashes Gas valve circuit error
8 Flashes Low flame sense signal


Flashing Slow Normal - No call for Heat from thermostat
Flashing Fast Normal - Call for Heat from thermostat
Continuous ON Control Board Bad - needs replaced
Continuous OFF Check Power
2 Flashes System Lockout (Retries or Recycles exceeded)
3 Flashes Vent Pressure Switch Error
4 Flashes Open High Temperature Limit Device
5 Flashes Flame sensed when no flame should be present
6 Flashes 115 Volt AC power reversed or Poor Grounding
7 Flashes Gas valve circuit error
8 Flashes Low flame sense signal
9 Flashes Check ignitor circuit and line "N" to 24 VAC Common voltage ( < 2 volts)
(possible grounding problem)



Ignition Only Control, used in older model furnaces.

Flashing Igniton Lockout (Retries exceeded)
Continuous ON Control Bad - needs replaced


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