HVACopediaCarrier · Air conditioner troubleshooting
Delay before the compressor restarts
What is going on
The outdoor unit waits before starting again - usually normal.
Likely causes
- Pressure equalizer valve cycle after every compressor stop
- 10-minute warm-up after high voltage power-up
- Protection delays from fault codes
Check in this order
- After every compressor stop the pressure equalizer valve opens for 150 s, then 15 s off before the next start - this cannot be bypassed.
- After power-up the compressor sump warms for 10 minutes (code 68).
- Brown-out recovery delay can be skipped by briefly shorting the Forced Defrost pins.
- Check the STATUS light for any other fault delay.
Applies to: Carrier Infinity 19VS variable speed air conditioner 24VNA9
More air conditioner guides
- Amber STATUS or green COMM light not on
- Compressor will not run - winding and electrical checks - Carrier split systems
- Hissing from the outdoor unit after it shuts off
- Outdoor unit unresponsive after several faults
- Superheat too high or too low on TXV system - Carrier split systems
- Two-stage unit not changing stages - Carrier 24ANB/25HNB/25HCB6
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Source: Carrier 25VNA8 / 24VNA9 Service Manual, Timing / delays p.8. Written in our own words; check the manual for your exact 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.