LED OFF No amber LED - no power to control

What the control is telling you

The status LED is dark, meaning the control is not getting 115 V or 24 V, or the control itself has failed.

Applies to: 59TP6A two-stage variable-speed ECM multipoise condensing gas furnace, all sizes (040-10 to 120-22)

Likely causes

• Open circuit breaker or broken supply wiring
• Blower door switch open or faulty
• Failed transformer
• Failed furnace control

Test and repair steps

1. Warning: Shut off 115-V power and gas, and lock/tag out before working inside the furnace; there may be more than one power source.
2. Check that the circuit breaker is closed and there is continuity in the wire from breaker to furnace.
3. Confirm the blower door is on and the door switch is closed; check for 115 V reaching the door switch. Replace the door switch if 115 V arrives but does not pass through.
4. Check for 115 V at L1 and L2 on the control.
5. Check for 24 V at SEC-1 and SEC-2; if 115 V is present but no 24 V, replace the transformer.
6. If 115 V and 24 V are both present but the LED stays off, replace the furnace control.

Settings for these units

• Filter sizes by casing width and filter cabinet · 59TP6A
• Minimum clearances to combustibles · 59TP6A