Lennox Air Conditioner: Simulate a refrigerant leak with the RDS Test button

Simulate a refrigerant leak with the RDS Test button on a Lennox air conditioner: After the 5-minute purge, pressing Test during a call makes the board act as if a leak was found, which checks wiring and response.

Homeowner with a air conditioner problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: Lennox EL16KC1 A/C with RDS blower control board 27A02 (R-454B)

How to fix simulate a refrigerant leak with the rds test button: step by step

1. Restore power and wait for the 5-minute purge to finish.
2. Cooling check: start a cooling call at the thermostat, press Test on the RDS board, and confirm the LED flashes blue, the blower runs and the outdoor compressor stops.
3. Press Test again to end the simulated leak.
4. Heating check (gas furnace): start a heat call, press Test, and confirm the blue flashing LED, blower on, burners off and compressor off. Press Test again to end it.

If the unit shows an error code, look it up: Lennox Air Conditioner codes

Models

EL16KC1-018-230AEL16KC1-024-230AEL16KC1-030-230AEL16KC1-036-230AEL16KC1-041-230AEL16KC1-042-230AEL16KC1-047-230AEL16KC1-048-230AEL16KC1-060-230A