Southern Boating
  • Boats
    • Center Consoles
    • Dual Consoles
    • Motoryachts
    • Power Cats
    • Sport Cruisers
    • Tenders & Ribs
  • Destinations
    • Bahamas
    • Caribbean
    • Pacific
    • U.S. Atlantic
    • U.S. Gulf
  • Engines
  • Maintenance
    • DIY
  • Electronics
  • Lifestyle
    • News
    • Fishing
    • Food
      • Menus
      • Drinks
      • Appetizers
      • Entrées
      • Dessert
      • Holiday
  • Gear
  • Shop
  • Digital Edition
  • Subscribe
  • Advertise
No Result
View All Result
  • Boats
    • Center Consoles
    • Dual Consoles
    • Motoryachts
    • Power Cats
    • Sport Cruisers
    • Tenders & Ribs
  • Destinations
    • Bahamas
    • Caribbean
    • Pacific
    • U.S. Atlantic
    • U.S. Gulf
  • Engines
  • Maintenance
    • DIY
  • Electronics
  • Lifestyle
    • News
    • Fishing
    • Food
      • Menus
      • Drinks
      • Appetizers
      • Entrées
      • Dessert
      • Holiday
  • Gear
  • Shop
  • Digital Edition
  • Subscribe
  • Advertise
No Result
View All Result
Southern Boating
No Result
View All Result
Home Maintenance DIY
Troubleshooting Your Boat’s Air-Conditioning System

Troubleshooting Your Boat’s Air-Conditioning System

March 16, 2022
in DIY
0
1.1k
SHARES
5.9k
VIEWS
Share on FacebookShare on LinkedInShare via Email

Cool and in Control

Learn what to do when the air conditioner stops working.

Ah, paradise. You have traveled to the warmer climates for the adventure of a lifetime, a cruise aboard a bareboat. After months of planning this charter, YOU are the captain. 

Relaxing on the bow, you are first to arrive in this gorgeous anchorage. Remember, sometimes you watch the show and sometimes you are the show, so be kind as you observe varied levels of talent and maritime skill come in throughout the evening. 

It’s dinner time in paradise. The winds have settled, and the balmy weather has turned a bit muggy. No worries, mon. Start the generator to provide 110-volt power to the boat and turn on those lovely air conditioners. Life is good.

Uh-oh. The air-conditioner fan is blowing warm air. Strange that it worked last night at the dock on shore power. What to do? This is hardly an emergency and the charter company can not be reached for advice. So swap your captain’s hat for a detective’s badge and let’s go to work.

Welcome Aboard Checklist

Upon your arrival, the charter company usually does a quick onboard review, including belowdeck items in the engine room. Since this may be your first true bareboat without a captain, the charter company wants to make sure you know the basics: how to check fluids, locate the bilge pumps, operate the VHF radio, use safety equipment, and so on. There is often a test drive to show you the ropes. 

Your checklist is complete, and the boat is yours for the duration of the charter. You are in command. And yes, the air conditioner was on its best behavior on day one. Hmmm.

Time to Cast Off

Enjoying your first night relaxing in the balmy climate, listening to some Caribbean music, and watching the sunset, you are so ready for this big adventure. Your first sunrise in paradise means it is up and at ’em early. You remember to check fluids before starting the engines: main engine oil, transmission fluid, generator oil, and, of course, antifreeze in all engines. Fuel is full, waste tank has only one night’s use, domestic water tank is topped to the brim. Sea cocks are open, blowers are operating, and you start the engines. With the comforting purr of the mains, you shut down all other unnecessary systems and unplug shore power. Yup, one of the last things you did was turn off the wonderfully cool air conditioner.  

Your crew prepares to cast off and away you go. Cruising around the sunny, clear waters all day is amazing with a breeze to keep you comfortable. At the day’s end, after a successful mooring ball pick up, you shut down the main engines for your first night away from the dock.

Troubleshoot 

The air conditioner worked perfectly while at the dock on shore power but is not cooling now on generator power. The generator is running and is providing power. You check other appliances, which are all working as expected. In fact, the air-conditioner fan is blowing, but cold air is not coming out. What is different?

Marine air conditioners are water-cooled and have a centrifugal water pump in the bilge that pulls raw water in from beneath the boat. Here is a great idea: Inspect the sea cock to confirm it is open. You may have bumped it closed while checking fluids in the engine spaces earlier. Okay, that’s open. Next, look into the strainer to see if it is fouled with any sea creatures or debris. That’s fine, too, and clean as a whistle. 

Finally, you check the water pump to see or feel if it is running. Ta-da! You found the culprit. The pump is NOT pumping water to cool the refrigerant compressor. 

Marine air conditioners need the constant flow of raw water to cool the hot refrigerant in the compressor unit. Without the cooling water flow, the refrigerant will heat up. When it overheats, you may see a High-Pressure Fault in the air-conditioning system. Some digital air-conditioner controllers show what looks like a HI P5 code that really means HI PS for High Pressure. Look for an overboard stream of air-conditioner water being pumped out after cooling the compressor. No water, no cooling and the air conditioner will fault in a High-Pressure mode.

Problem Solved

Now you discovered the problem—the water pump is not running. So how do you solve the issue? Go to the master circuit breaker panel. Look at the Alternating Current panel to see if the air conditioner water pump circuit breaker is in the ON position! Oops, it was still off. Flip it to the ON position, and the problem is solved! 

You are the hero. Take a bow. You and your crew are now enjoying a cool evening in air-conditioned comfort. Ah, paradise…. 

-by Capt. Chris Caldwell

Captains Chris & Alyse Caldwell are USCG 100-ton Masters and cruising coaches who offer personal boat training online or onboard your boat anywhere. The Caldwells help build your cruising confidence with hands-on training, with their AskCaptainChris.com training videos, through two-day seminars filled with tons of tips for the boater who loves learning, and now remote learning. If you have additional questions for Captains Chris or Alyse, please email them at chris@captainchrisyachtservices.com.

Subscribe to the print magazine | $29.95 for 12 issues
Previous Post

The All-New Aquila 70 Power Catamaran

Next Post

Southern Boating TV: Azimut Yachts Series Part 1

Next Post
Southern Boating TV: Azimut Yachts Series Part 1

Southern Boating TV: Azimut Yachts Series Part 1

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Recommended

Fountaine Pajot 40 LC & 47 LC

Fountaine Pajot 40 LC & 47 LC

June 1, 2014
3.5k
Simple and Beautiful Greek Mezes

It’s all Greek to me: Galley-Friendly Recipes

September 13, 2016
3.3k

Don't miss it

Kicker Marine Audio speaker system installed on a boat with white upholstery
Audio

Did You See Kicker Marine Audio’s New Product? The M-Class Speaker System

July 9, 2025
3.3k
Center Console Boat turning while running on water
Boats

Center Console Boats and Their History: From Simplicity to Luxury

July 8, 2025
3.4k
Man on bow using summer fishing tips as he casts his line
Fishing

Effective Summer Fishing Tips: How to Catch Fish in Hot Weather

July 8, 2025
3.3k
Bermuda island aerial view with a lighthouse in the foreground and the ocean skyline in the background
Caribbean

Is Bermuda Worth the Crossing? Here’s the Boater’s Take

July 2, 2025
3.6k
Dometic’s DG3 gyrostabilizer
Engines

Smooth Ride With The New DG3 Gyro by Dometic: Fast Spin-Up, All Electric

July 1, 2025
3.7k
Bertram Sportfisherman Yacht 2025
Boats

11 New Sportfishing Boats Built for Speed & Style in 2025

July 1, 2025
3.9k
Facebook Instagram TikTok Youtube LinkedIn

Navigation

  • About Us
  • Advertise
  • Subscribe
  • Careers
  • Contact Us
  • Terms Of Service
  • Privacy Policy
  • Manage My Subscription
logo

1591 E. Atlantic Blvd, 2nd Floor
Pompano Beach, FL 33060
Office: +1 (954) 522-5515
Fax: +1 (954) 522-2260
Contact us: info@southernboating.com


Newsletter

* indicates required

© 2024 Southern Boating Media

No Result
View All Result
  • Boats
    • Center Consoles
    • Dual Consoles
    • Motoryachts
    • Power Cats
    • Sport Cruisers
    • Tenders & Ribs
  • Destinations
    • Bahamas
    • Caribbean
    • Pacific
    • U.S. Atlantic
    • U.S. Gulf
  • Engines
    • Engine Buyers Guide
  • Maintenance
    • DIY
  • Electronics
  • Lifestyle
    • News
    • Fishing
    • Food
    • Drinks
    • Appetizers
    • Entrées
    • Dessert
    • Holiday
  • Gear
  • Shop
  • Digital Edition
  • Advertise
  • Subscribe

© 2024 Southern Boating Media

  • About Us
  • Advertise
  • Subscribe
  • Careers
  • Contact Us
  • Terms Of Service
  • Privacy Policy
  • Manage My Subscription
  • About Us
  • Advertise
  • Subscribe
  • Careers
  • Contact Us
  • Terms Of Service
  • Privacy Policy
  • Manage My Subscription