Carrier 42PHQ018P User Manual (English)

Questions and Answers:

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Timothy BoydAug 13, 2025
What to do if my Carrier Air Conditioner compressor and fan of the outdoor unit will not start?
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  Christine LewisAug 13, 2025
  If the compressor and fan of the outdoor unit won't start, begin by checking the mains power connections and ensuring the unit is switched to the ON position. If that doesn't work, wait for 3 minutes to see if the compressor cycling protection is active. Check and eliminate the cause (refer to “Additional installation instructions”). Also, examine the electrical connections for looseness or errors and repair them if necessary.
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Stuart SandersAug 17, 2025
Why does my Carrier Air Conditioner compressor run continuously?
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  Mr. Eric HouseAug 18, 2025
  If the compressor runs continuously, check the temperature selection. A low refrigerant charge could also be the cause, so verify and add refrigerant if needed. Additionally, air or other non-condensable gases in the circuit might be the issue, requiring you to drain the refrigerant, evacuate, and recharge the system. Finally, check for any obstructions and clean the filter.
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Cindy PerezAug 21, 2025
What to do if my Carrier 42PHQ018P discharge pressure is too high?
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  eoconnellAug 21, 2025
  If the discharge pressure is too high, start by cleaning the outdoor coil or removing any obstructions. If the refrigerant charge is too high, drain some refrigerant. Also, if there is air or other non-condensable gases in the circuit, drain the refrigerant, evacuate, and recharge the system. Check the head pressure controller by connecting the fan directly and replace the HPC if necessary.
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christina59Aug 25, 2025
What to do if my Carrier Air Conditioner compressor will not start, but outdoor fan is running?
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  Todd HenryAug 26, 2025
  If the compressor won't start but the outdoor fan is running, check the compressor's electrical connections for looseness or errors and repair them. Also, the compressor might be burnt out, seized, or its protection device could be activated, so check for the cause and replace the compressor if necessary.
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ellisjesseAug 29, 2025
What to do if my Carrier 42PHQ018P Air Conditioner has frequent ice build-up on outdoor coil during heating?
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  Pam RiveraAug 29, 2025
  If there's frequent ice build-up on the outdoor coil during heating, check if the outdoor fan is working correctly and repair if needed. Also, check the electrical connections between the indoor and outdoor units and repair any wrong connections.
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Ashley AllenSep 1, 2025
What to do if my Carrier 42PHQ018P compressor starts, but stops due to its overtemperature protection?
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  Eugene SmithSep 1, 2025
  If the compressor starts but stops due to overtemperature protection, it could be due to a wrong refrigerant charge (excessive or low) or air/non-condensable gases in the circuit; in this case, drain refrigerant, evacuate, and recharge. Remove any obstructions. Check cause and repair. Check and replace. Check and remove obstructions.
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Alex LarsonSep 4, 2025
What to do if my Carrier 42PHQ018P Air Conditioner discharge pressure is too low?
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  Erin BowmanSep 4, 2025
  If the discharge pressure is too low, it could be due to a low refrigerant charge, in which case you should add refrigerant. Another cause could be a dirty or obstructed outdoor coil, so clean or remove any obstructions. Also, a dirty indoor unit air filter can cause this issue, so clean the filter.
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Jeffrey ScottSep 9, 2025
What causes outdoor fan cycling due to its overtemperature protection in Carrier Air Conditioner?
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  Kevin WeissSep 9, 2025
  If the outdoor fan is cycling due to its overtemperature protection, the fan capacitor might be faulty, so replace it. Check connections and repair.