Marine Air Conditioning Maintenance and Servicing

Marine air conditioning maintenance covers seawater flow, filters, coils, condensate drainage and seasonal checks. Browse the tasks below, then follow the maintenance schedule for your exact model. Accessible strainers and filters help owners spot changes before arranging a service.

Marine technician checking an accessible seawater strainer and pump aboard a sailing yacht — The best maintenance feature is access: you should be able to see and clean the strainer without dismantling the cabin.

Weekly and Monthly Marine Air Conditioning Checks

Cleaning the seawater strainerThe single most important maintenance job on a marine air conditioner, and the cause of most warm cabins. Weekly in weedy water, monthly elsewhere.Weekly in summer, monthly otherwise · 10 minutes
Cleaning ducting, grilles and the return-air filterRestricted airflow makes a correctly sized unit behave like an undersized one, and the return-air filter is the usual culprit.Filter monthly in season; ducting annually · 30 minutes
Monthly checks in the tropicsNorth of Gladstone the system runs most of the year and the water is full of things. A short monthly routine, not the annual one.Monthly, year-round · 15 minutes

Annual Marine Air Conditioning Service Tasks

Descaling the condenserMarine growth and scale build up inside the condenser coil and quietly reduce capacity. An annual job, and the one most owners skip.Annually, or when cooling drops with a clean strainer · 2–3 hours
The annual service checklistEverything worth doing once a year, in the order a technician would do it. About half is owner work.Annually, before the season · Half a day
Laying up for winterFresh water through the loop, drain what will freeze, and leave the strainer bowl dry. Fifteen minutes that saves a pump.Annually, southern states · 30 minutes
Recommissioning in springThe reverse of laying up, plus the checks that catch what happened over winter. Do it a fortnight before you need it, not the day you do.Annually · 1 hour
Seacock and through-hull serviceThe one part of the system that can sink the boat. Exercised annually, serviced when it stops moving freely.Exercise annually; service on the hard · 15 minutes to exercise
Winter shutdown, by where you keep the boatLay-up in Hobart and lay-up in Cairns are different jobs. In the tropics you may not shut down at all.Annually, if at all · Varies
Checking refrigerant charge, and who may do itYou may observe the symptoms. You may not open the system — that needs an ARCtick licence, whatever your skill level.Annually, by a licensed technician · Technician visit
What to carry aboard as sparesFour items cover most of what fails a long way from a chandlery, and together they cost less than one call-out.Once, then check annually · —

Marine Air Conditioning Surveys and Replacement Parts

Flushing the condensate drainA 16k unit pulls litres of water a day out of humid air. The drain grows a slime that blocks it, and then the water goes somewhere else.Start and middle of each season · 20 minutes
Seawater pump — maintenance and when to replaceThe part that fails first and most often. Centrifugal pumps have no impeller to change, so this is about mounting, priming and noise.Check at every service · 20 minutes to inspect
What to check at a pre-purchase surveyAir conditioning is rarely surveyed properly. Ten minutes of checks tells you whether you are buying a working system or a five-figure job.Once, before you buy · 20 minutes

Essential Marine Air Conditioning Maintenance Checks

Clean the strainer — weekly in summer. Ten minutes, and it is the cause of most warm cabins in Australia.

Flush the condensate line — twice a season. It blocks quietly and then the water goes somewhere you do not want it.

Exercise the seacock — annually. It is the one part of the system that can sink the boat.

Providers from YouSail

Find Help with Marine Air Conditioning

Choose a state to find where listed businesses are based. Confirm your marina is in their service area and that they handle the work you need.

Bird Electrical Marine Electrical, Air Conditioning and RefrigerationTerrey Hills, NSWMarine electrical · Marine electronics · Navigation electronics · Marine refrigerationView provider and contact details →Bird Electrical Marine Electrical, Air Conditioning and RefrigerationBrooklyn, NSWMarine electrical · Marine electronics · Navigation electronics · Marine refrigerationView provider and contact details →Electech IndustriesManly, QLDMarine electrical · Marine electronics · Marine communications · Marine refrigerationView provider and contact details →NEWPORT MARINE ELECTRICALNewport, NSWEngine service · Marine electrical · Marine electronics · Marine refrigerationView provider and contact details →Sydney Marine ElectricalDrummoyne, NSWMarine electrical · Marine electronics · Marine refrigeration · WatermakersView provider and contact details →

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