HVACopediaTrane · Air conditioner
LL Lockout: low pressure (LPCO)
What the control is telling you
Low suction pressure cutout caused a lockout. Manual lists only the meaning (A1000BA board); steps are general checks drawn from other sections of the guide.
Applies to: Trane 5TTR7 multi-speed AC (5TTR7024A-060A)
Likely causes
- Low charge / leak
- Service valve not fully open
- Low indoor airflow or iced coil
- Restriction
Test and repair steps
- Check charge (low charge trips LPCO).
- Confirm both service valves are fully open.
- Check indoor airflow, filter and indoor coil in cooling; outdoor coil icing in heating.
- Check for restrictions in liquid line or drier.
Settings for these units
Outdoor unit placement · Trane 5TTR7
| Item | Value |
|---|---|
| Above unit | 5 ft clear |
| Service side | 3 ft |
| Walls / shrubs | 12 in. min |
| Pad | 1 in. larger than unit all round, level, separate from house |
| Cold climate (HP) | raise 3-12 in. above pad |
| Within 1 mile of salt water | add BAYSEAC001 if no factory salt shield |
| Operating range | cooling 55-120 F, heating 0-66 F |
Avoid bedroom walls and under roof drip lines.
Dimensions and weights · Trane 5TTR7
| Model | H x D x W (in.) | Weight (lb) |
|---|---|---|
| 5TWR7024A | 41 x 30 x 33 | 181 |
| 5TWR7036A | 41 x 30 x 33 | 194 |
| 5TWR7048A | 41 x 34 x 37 | 231 |
| 5TWR7060A | 41 x 34 x 37 | 241 |
| 5TTR7024A | 41 x 30 x 33 | 176 |
| 5TTR7036A | 41 x 30 x 33 | 189 |
| 5TTR7048A | 41 x 34 x 37 | 226 |
| 5TTR7060A | 41 x 34 x 37 | 236 |
Weights are estimated, uncrated.
Models that show this code
4 models in Trane 5TTR7
Other codes on the same units
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Source: Trane ODR-SVN002E-EN (5TTR7/5TWR7 installer's guide) - section Integrated Variable Speed Control Board LED Indicators, Table 18 (A1000BA models). Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
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.