Service & test modes: Air Handler tips

Short, practical technician tips on service & test modes for air handler. Check each one against the manual for your exact model before acting.

Run the R-32 leak alarm test (RDS test mode)

Goodman · AMST/AWSF/ACSF R-32 air handlers

Simulates an R-32 leak alarm for 5 minutes to prove the system reacts; the red LED flashes fast as in a real alarm.

1. Press the manual test button on the control board 2 times within 5 seconds
2. The LED flashes fast and the control acts as if a leak were detected
3. The test ends by itself after 5 minutes, or press the button once to stop it early

Read or clear the last 6 faults (L6F menu)

Trane · P0V0 modular blower integrated control (IMBC)

The L6F menu shows the last six faults and clears them from inside.

1. Press Menu until L6F appears, press Option to enter and view the faults
2. To clear: hold Option at least 5 seconds inside the menu; release and three dashes appear three times

Run test mode (furnace)

Trane · P0V0 modular blower integrated control (IMBC)

Lets the technician watch the blower perform its stages without starting the outdoor unit. Option holds (HLD) a step. The blower takes roughly 70 seconds to start the test.

1. Press Menu until run appears, then press Option; the display flashes three times and the test begins
2. Blower runs at 1st-stage compressor speed 30 s, then 2nd-stage speed 30 s; the pair repeats two more times
3. Exit with a short press of Menu, by cycling blower power, or by making a valid call for capacity or fan