HVACopediaKeepRite · Air conditioner
TRIP + ALERT flashing together Comfort Alert - control voltage too low to operate
What the control is telling you
Both TRIP and ALERT lights flash at the same time: control voltage is too low.
Applies to: KeepRite CXA6/HXA6/TXA6 all sizes; C4A3/H4A3/T4A3 sizes 18 and 36-60 (Comfort Alert module)
Likely causes
- Weak transformer or low line voltage
Test and repair steps
- Measure 24 V at the module.
- Check transformer and line voltage.
Settings for these units
Outdoor unit clearances · KeepRite C4A3/CXA6 AC
| Location | Minimum |
|---|---|
| Service end | 24 in. (610 mm) |
| Above unit | 48 in. (1219 mm) |
| One side | 6 in. (152 mm) |
| Other sides | 12 in. (305 mm) |
| Between units | 24 in. (610 mm); 18 in. (457 mm) with no overhang within 12 ft |
| Roof mount height above roof | 6 in. (152 mm) |
| Shrubs/fences from coil | 18 in. (457 mm) |
Keep roof run-off and snow from falling on the unit.
Unit must be level within 2 degrees.
Models that show this code
2 models in KeepRite C4A3/CXA6 AC
Other codes on the same units
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Source: KeepRite/ICP C4A3/H4A3/T4A3/CXA6 Installation Instructions 421 01 5103 05, Fig. 15 Comfort Alert Diagnostics, p.13. 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.