Carrier Error Code 5: Five flashes – brownout protection setting (24ANB/25HNB) (AC)
Carrier error code 5 on a air conditioner means: Five flashes - brownout protection setting (24ANB/25HNB). It is also called Carrier diagnostic code 5.
Homeowner? What Carrier code 5 means for you
Usually minor Your air conditioner is reporting: Five flashes - brownout protection setting (24ANB/25HNB). This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Check both breakers and the outdoor disconnect box beside the outdoor unit; all should be ON.
- Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
- Keep about 2 feet around the outdoor unit clear of leaves, grass and debris.
- If you see ice on the pipes or the indoor coil, turn the system off and run only the fan for a few hours, then call a technician.
- Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Carrier error code 5 mean?
Five flashes and a pause on the amber STATUS LED report the state of the 230 V brownout protection after the installer toggles it (a last resort for very noisy power). The manual contradicts itself: Table 18 lists 5 flashes as protection disabled and 6 as active, while the written procedure says 5 = active (shipped state) and 6 = disabled. Confirm on the unit before relying on either reading. While the forced defrost short remains, OAT and OCT sensor faults are not cleared.
Applies to: Carrier 24ANB/25HNB two-stage units
Carrier models that use code 5
24ANB12424ANB13624ANB14824ANB16024ANB72424ANB73624ANB74824ANB760
Other Carrier AC codes
All Carrier Air Conditioner error codes →
Carrier code 5: homeowner questions
What does Carrier code 5 mean?
Five flashes - brownout protection setting (24ANB/25HNB). Five flashes and a pause on the amber STATUS LED report the state of the 230 V brownout protection after the installer toggles it (a last resort for very noisy power). The manual contradicts itself: Table 18 lists 5 flashes as protection…
Is it safe to keep using my air conditioner with code 5?
Usually yes. Code 5 is normally minor, but if it keeps coming back have it checked.
Can I reset Carrier code 5 myself?
You can try one reset (power off for 30 seconds, then on). If Carrier code 5 comes back, the cause is still there and a licensed technician should check it.
Who can fix Carrier code 5 near me?
Aurora Star Tech Inc. repairs Carrier air conditioners in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: AC Running But Not Cooling: What to Check
Troubleshooting guides
- Not cooling All brands · Air Conditioner
- Amber STATUS or green COMM light not on Carrier · Air Conditioner
- Compressor will not run - winding and electrical checks - Carrier split systems Carrier · Air Conditioner
- Delay before the compressor restarts Carrier · Air Conditioner
- Hissing from the outdoor unit after it shuts off Carrier · Air Conditioner
- Outdoor unit unresponsive after several faults Carrier · Air Conditioner
- Recall the active status code on the outdoor board (25VNA8/24VNA9) Carrier · Air Conditioner
- Refrigerant charging mode on Infinity control (25VNA8/24VNA9) Carrier · Air Conditioner
- Superheat too high or too low on TXV system - Carrier split systems Carrier · Air Conditioner
- Two-stage unit not changing stages - Carrier 24ANB/25HNB/25HCB6 Carrier · Air Conditioner
Source: Carrier residential A/C and heat pump service manual 24-25, Table 18 (brownout rows) and 230 V Brown-Out Protection Defeated, p.59-61. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.