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If your AC stops cooling after a storm, start with the thermostat, air filter and what you can observe from outside the equipment. A storm may be followed by a tripped breaker or electrical damage, but timing alone cannot identify the cause. Avoid opening electrical equipment or attempting repairs; recurring breaker trips, an outdoor unit that will not run, ice or persistent loss of cooling call for a qualified HVAC technician.
Start with checks that do not require opening the equipment
- Check the thermostat. Set it to Cool and choose a temperature below the current room temperature. Check the display and replace dead batteries if the thermostat uses them.
- Inspect the air filter. Replace it if it is clogged or visibly dirty. Restricted airflow can reduce cooling and contribute to a frozen indoor coil.
- Observe the system. Note whether the indoor blower runs, whether the outdoor unit runs, and whether a breaker appears to have tripped. Do not remove equipment panels to investigate.
- Keep the outdoor unit clear. Make sure leaves or other obstructions are not blocking airflow around it. Do not touch wiring or electrical components.
These checks can identify simple issues and give a technician useful details; they cannot confirm whether a storm damaged a component.
What the symptoms may indicate
| What you notice | Possible explanation | What to do |
|---|---|---|
| The thermostat display is blank, or the system does not respond to a cooling call. | Dead thermostat batteries, an incorrect setting, or an interruption to power may be involved. | Check the thermostat setting and batteries. If it still does not call for cooling, arrange service. |
| The indoor blower runs, but the outdoor unit does not. | The outdoor unit may have lost power, or an internal part such as a capacitor or contactor may have failed. These are possibilities, not a diagnosis. | Do not open the unit or attempt component repairs. Contact an HVAC technician if the outdoor unit remains off. |
| The system runs but airflow is weak or cooling is poor. | A dirty filter or another airflow problem may be contributing. Restricted airflow can also be associated with a frozen evaporator coil. | Replace a dirty filter. If you see ice or cooling does not return, switch off the system and call a technician. |
| The thermostat is on, but cooling will not start, and there is water near the indoor equipment. | Some systems have a safety float switch that can interrupt cooling when water backs up. | Do not bypass the switch. Have the drainage issue and system checked by a professional. |
| A breaker appears tripped, or the system stopped after the storm. | A power interruption or surge-related fault is possible; the timing does not prove lightning caused damage. | Follow the instructions on the electrical panel and equipment. If you are uncertain, do not reset it; call a qualified professional. |
Be cautious with a tripped breaker
Guidance on resetting breakers varies. Only consider a reset if you are comfortable and competent to do so, and follow the instructions for your panel and equipment. If the breaker trips again, stop: do not keep resetting it. Repeated trips can signal a fault that needs professional diagnosis.
When to call an HVAC technician
- A breaker trips again after a reset, or you are unsure how to check it safely.
- The outdoor unit stays off while the indoor blower runs.
- Cooling does not return after checking the thermostat and replacing a dirty filter.
- You see ice, water backup, signs of electrical damage, or another problem you cannot safely identify.
Electrical diagnosis inside the equipment, component replacement and refrigerant assessment are work for a qualified HVAC professional. Do not open electrical panels, touch wiring, bypass safety switches or attempt refrigerant work.
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#1 Best Overall
BOJACK 35+5uF 35 5 MFD ±6% 370V/440V CBB65 Dual Run Circular Start Capacitor for AC Motor Run or Fan Start or Condenser Straight
- BOJACK 35+5uF ±6% 370V/440V CBB65 Dual run circular start capacitor
- Capacitor dimension: Diameter, Height
- Operating temperature: -40 ℃ to +70℃/-104℉to+158℉
- Safety rated: 10,000 AFC
- Three terminals on the top are labeled "Herm"/"H" for the compressor motor, "Fan"/"F" for the fan, and "C" for the common line.
Can a surge protector prevent this?
An HVAC surge protector is a forward-looking accessory to consider before a storm, not a repair for an AC that has already stopped cooling. Trane recommends considering one because electrical surges associated with lightning can damage HVAC equipment. Protection depends on the product and installation; verify compatibility with your equipment and any installation requirements rather than assuming one model or specification fits every system. A technician can advise on a suitable option.
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Bestseller No. 1
Bestseller No. 2
Best Value
Fits for Dometic 3312195.000 Air Conditioner RV AC Motor Capacitor 60/5 MFD, Heavy Duty Air Conditioner Capacitor Replacement, Compatible with Dometic 3312195000 RV Air Conditioner Models
- 【Compatibility】Designed to fit popular RV air conditioner models, this 3312195.000 motor capacitor is compatible with units like 57915.741, B595146, B59146, B59186, and B59196. (*Please confirm specifications before purchasing to ensure a proper fit.)
- 【Key Specifications】Voltage: 370VAC；Capacitance: 60/5 MFD；Operating Temperature: -40°F to +185°F (-40°C to +85°C)；Frequency: 50/60Hz；Humid Heat Test Duration: 21 days.
- 【Enhanced AC Performance】This capacitor stabilizes voltage and current while optimizing motor speed and power, leading to improved air conditioning performance and system reliability. Ideal for maintaining a steady and efficient cooling system.
- 【Simple Installation】The capacitor features three labeled terminals: “Herm”/“H” for the compressor motor, “Fan”/“F” for the fan motor, and “C” for the common line. As a 2-in-1 capacitor, it powers both the compressor and fan motor for streamlined functionality.
- 【Durable & Safe Design】Built with explosion-proof technology and nickel-plated copper terminals, this capacitor offers enhanced safety and durability. Its high-quality materials ensure long-lasting performance, even in demanding environments.
Rank #4
VEXUNGA 45/5 uF 45+5 MFD 370V or 440V Dual Run Start Round A/C Capacitor 45 5 uF 370 440 Volt VAC CBB65B Air Conditioner Capacitors for AC Unit Fan Motor Start or Heat Pump or Condenser Straight Cool
- VEXUNGA 45+5 uF ±6% 370/440 VAC CBB65 dual run start capacitor replacement for BOTH 370 & 440 Volt capacitors.
- 45/5 MFD Capacitor size measures ( 2.36inch / 60mm ) in Diameter x ( 3.35inch / 85mm ) in Height.
- Operating temperature: -40℃ to +70℃/-104℉ to +158℉. Frequency: 50/60 Hz.
- SUPER EASY to Replace: Direct replacement, No wiring or adapter changes required.
- Dual capacitors have three terminals, three terminals on the top are labeled "Herm"/"H" for the compressor motor - White Cap , "Fan"/"F" for the fan - Green Cap , and "C" for the common line - Black Cap.
Rank #3
PowerWell 45+5 MFD 45/5 uf 370 or 440 Volt Dual Run Round Capacitor PW-45/5/R for Condenser Straight Cool or Heat Pump Air Conditioner - Guaranteed to Last 5 Years
- 45+5 uf or 45+5 MFD 440 Volt AC Capacitor. Replaces BOTH 370 VAC & 440 VAC capacitors
- Can size measures 2-3/8" diameter x 4" tall. Operating temperature range -40 C. to +70 C/ -40F to 158
- Built to the TOUGHEST USA standards for AC motor run capacitors including EIA-456-A and IEC 60252-1:2001
- GUARANTEED TO LAST 5 YEARS. We are extremely passionate about our products and are fanatical about quality control in our workshops. ORDER NOW with peace of mind. No Catches
- Replacement for 97F9895 , Z97F995 , 97F9895BZ3 , 27L880 , TRCD455 , TRCFD455 , PRCFD455 , 27L889 , 97F9851 , 97F9851S , 12788 , RC0114 , Z97F9895 , 97F9895 , TT-CAP-45/5/440R , HC98KA046 , TP-CAP-45/5/440R , CAP050450440RT , HC98JA046 , HCKS450D050R440Z , 00662441180262
Rank #2
BOJACK 45+5 uF 45/5 MFD ±6% 370V/440VAC CBB65 Dual Run Circular Start Capacitor for AC Motor Run or Fan Start or Condenser Straight
- BOJACK 45+5uF ±6% 370V/440V CBB65B Dual run circular start capacitor
- Capacitor dimension: Diameter(65 mm/2.56 inch) Height(95 mm/3.74 inch)
- Operating temperature: -40 ℃ to +70℃/-104℉to+158℉ ，Safety rated: 10,000 AFC
- Three terminals on the top are labeled "Herm"/"H" for the compressor motor, "Fan"/"F" for the fan, and "C" for the common line.
- Replacement for 97F9895 , Z97F995 , 97F9895BZ3 , 27L880 , TRCD455 , TRCFD455 , PRCFD455 , 27L889 , 97F9851 , 97F9851S , 12788 , RC0114 , Z97F9895 , 97F9895 , TT-CAP-45/5/440R , HC98KA046 , TP-CAP-45/5/440R , CAP050450440RT , HC98JA046 , HCKS450D050R440Z , 00662441180262
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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