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Discussion Starter · #1 ·
We have a 2000 Catalina 320. Yesterday, as we were backing into the slip, a loud rattling hum developed in the aft port locker area. Naturally, i ignored it, since it lasted only a couple seconds before we turned off the engine. I assumed that we'd ingested something nasty that would magically go away over night.

It didn't. Today, when we returned to the boat, the hum was back. it's a very loud rattling humming sound that seems to be coming from the Adler Barbour unit. The refrig is still cooling as well as it did before. The hum only happens when we switch turn the ignition switch to the "on" position -- we don't even have to have the engine running. (The hum is still there if we turn on the engine.) What's peculiar to me is that it's still there even if we switch the refrigeration OFF on the circuit panel. Also, the hum exists whether we switch the panel from A/C to DC: as long as the ignition switch is turned on, the hum is there. And it's too loud to ignore.

Has anyone had a similar experience? Any suggestions? I can sorta' live without a running refrigerator unit while we're sailing; we're mostly day sailors anyway. But having that loud humming while the engine is on will be really annoying for the 15-20 minutes it takes us to get out of the slip before we put up the sails....

thanks!
 

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One of None
Hunter 34
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8,638 Posts
The Refridge may be wired to run right from the battery bank. First thing you should check is the condenser fan on the unit. I've a feeling it's broke, bad bearing or fell apart. The Refridge would still work without the fan.

I'd suggest you get a bit more personal with your boat and learn all about her systems.

Jus sayin...
 

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Discussion Starter · #3 ·
thanks for the suggestion, but I got up close and personal. Well, actually down n dirty, squatting in that aft locker. The fan is running with no problem, at least on shore power. Nice n quiet. What would cause it to change if it went onto DC?
 

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One of None
Hunter 34
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Maybe something else is humming? ON shore power I think the Refridge would still be on 12 volt if it's AB. I think some boats hum if the polarity is wrong on the AC coming in. Bilge blower maybe? I hate to think the comp is bad.. it can happen but extremely rare for a piston related type of failure on the inside of the "can" Try the old "hose to the ear and on the noisy part trick"?
 
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