HVACopediaTrane · Furnace
CP2 Cooling / heat pump, stage 2
What the display is showing
S8X1 label for a second-stage cooling or heat pump call, alternating with the tap readout.
Applies to: S8X1
Settings for these units
Return filter size by cabinet width · Trane S8B1, Trane S8X1, Trane S8X2
| Cabinet width | Filter |
|---|---|
| 14-1/2 in. | 1 - 14 x 25 x 1 in. |
| 17-1/2 in. | 1 - 16 x 25 x 1 in. |
| 21 in. | 1 - 20 x 25 x 1 in. |
| 24-1/2 in. | 1 - 24 x 25 x 1 in. |
Filters are field supplied and mounted outside the cabinet.
Over 1600 CFM upflow: return on both sides, one side plus bottom, or bottom only.
Models that show this code
9 models in Trane S8X1
Other codes on the same units
- CP1 Cooling / heat pump, stage 1 (single-stage models)
- E01 Furnace control internal failure
- E2.1 Ignition retries exceeded - flame never proven (1 hour lockout)
- E2.2 Flame recycles exceeded - flame lost after lighting (1 hour lockout)
- E2.3 1st stage gas valve not powered when it should be (10 times)
- E3.1 1st stage pressure switch (PS1) closed when it should be open
- E3.2 1st stage pressure switch (PS1) open when it should be closed
- E04 Open limit (main limit, rollout or reverse airflow)
Save it for the next call
Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.
Source: Trane S8B1/S8X1/S8X2 installation 18-CE14D1-1A-EN, System Status Menu, p.57; Sequence of Operation, p.61. Summarized in our own words; check the original manual for your model.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.