KeepRite · Air conditioner

5 Comfort Alert 5 - open circuit

High severity KeepRite C4A3/CXA6 AC

What the control is telling you

Yellow ALERT, 5 flashes: no current path to the compressor.

Applies to: KeepRite CXA6/HXA6/TXA6 all sizes; C4A3/H4A3/T4A3 sizes 18 and 36-60 (Comfort Alert module)

Likely causes

Disconnect, breaker or fuses open
Contactor failed open
Manual-reset high pressure switch open
Open compressor supply wiring
Long protector reset time in extreme heat
Damaged windings

Test and repair steps

Check power through the disconnect and contactor.
Reset/check any manual high-pressure switch.
Check compressor wiring.
Allow time for the protector to reset, then ohm the windings.

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

C4A3CXA6

Other codes on the same units

1 Comfort Alert 1 - long run time
2 Comfort Alert 2 - system pressure trip
3 Comfort Alert 3 - short cycling
4 Comfort Alert 4 - locked rotor
6 Comfort Alert 6 - open start circuit
7 Comfort Alert 7 - open run circuit
9 Comfort Alert 9 - low control voltage
16 Lost communication with wall control

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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.