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Old 08-01-2014, 07:17 PM   #1
mavagrand
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Refrigerator humming

Brand new 299BH, have it plugged into the house using a heavy duty extension cord I picked up at CW. I know the camper would pull too many amps if I ran everything at once, so I'm only running the refrigerator and, occasionally, the A/C when we're in it. I noticed today that the refrigerator was humming loudly. There was not trouble light on and it was running off the electricity. It was cold and seemed to be working but just humming. It's a Dometic model. anyone have any suggestions?
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Old 08-01-2014, 07:27 PM   #2
chuckster57
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Have you looked for a fan in the refer cabinet?
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Old 08-02-2014, 03:26 AM   #3
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The fridge wouldn't be installed in close proximity to the converter/power center would it?
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Old 08-02-2014, 04:19 AM   #4
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The refrigerator in the 299BH is located in the street side slide. There is a fan mounted between the two vents (on the refrigerator exterior coils) to push heat up and out of the top vent. It comes on about 95*F and will run until the temperature around the coils drops to about 85-90*F.

What you're hearing is that fan. If you want to verify that "nothing else is humming" you can remove the lower vent, from the black box on the lower left side of the refrigerator you'll see a red wire that leads right and up toward the middle of the refrigerator. There is an "inline" fuse holder on that red wire. Twist it open, remove the fuse and the fan will stop.

While you're there with the vent open, it's a great time to doublecheck the routing of your corrugated drain tube. It should come from the tube on the back of the drain pan (located inside the refrigerator box directly under the cooling fins in the top of the refrigerator section, and it should be securely routed out one of the vent squares on the vent cover. There is a small plug in the end of that hose with 3 holes in it. Do not lose that plug or "bugs 'n critters" can set up residence in the tube.

I wouldn't think the converter/power center is mounted in the slide, but stranger things have happened.....
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Old 08-03-2014, 03:29 AM   #5
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John, I'd wondered if it was the fan, it just seems so loud. It is July here in Florida, 95* in the shade so I think I'll unplug it, no sense having that fan continually run to cool down an empty refrigerator. The camper is brand new and we haven't had a chance to take it out so we spend an occasional night in it here at the house just to test the systems.
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Old 08-03-2014, 07:48 AM   #6
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mavagrand,

If the refrigerator is turned off, the fan should NOT be running. If you are running your refrigerator, the outside temp is above 95*F (or around that) and you unplug the fan for a long period of time, you will decrease the air flow behind the coils (in the exhaust chimney) and you will not only decrease the refrigerator efficiency, you will make it work harder to maintain the freezer and refrigerator setting. That could hasten the failure of the unit by causing the electrical heating element to function longer, the ammonia (or helium) cooling system to function for longer periods of time at higher than normal temperatures and cause increased temperatures behind your refrigerator. Below about 95*F, the fan usually doesn't function because the ambient temperature around the coils is cool enough not to affect the refrigerator efficiency. Above that "magic temperature" you need to have the fan's help to keep the hot air moving.

Turning the refrigerator to OFF will (or should) stop all the functions of the refrigerator and cause the fan to stop "humming".

If your refrigerator has been functioning and you turn it off, don't forget to open the door so it can dry out. Otherwise, you'll have a "fungal mess" the next time you open the door.
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Old 08-03-2014, 08:41 AM   #7
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Maybe it just doesn't know the words...I crack me up.
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Old 08-03-2014, 03:35 PM   #8
mavagrand
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Quote:
Originally Posted by JRTJH View Post
mavagrand,

If the refrigerator is turned off, the fan should NOT be running. If you are running your refrigerator, the outside temp is above 95*F (or around that) and you unplug the fan for a long period of time, you will decrease the air flow behind the coils (in the exhaust chimney) and you will not only decrease the refrigerator efficiency, you will make it work harder to maintain the freezer and refrigerator setting. That could hasten the failure of the unit by causing the electrical heating element to function longer, the ammonia (or helium) cooling system to function for longer periods of time at higher than normal temperatures and cause increased temperatures behind your refrigerator. Below about 95*F, the fan usually doesn't function because the ambient temperature around the coils is cool enough not to affect the refrigerator efficiency. Above that "magic temperature" you need to have the fan's help to keep the hot air moving.

Turning the refrigerator to OFF will (or should) stop all the functions of the refrigerator and cause the fan to stop "humming".

If your refrigerator has been functioning and you turn it off, don't forget to open the door so it can dry out. Otherwise, you'll have a "fungal mess" the next time you open the door.
Once again, thanks for the info, I did not know I needed to prop the door open, I'll do that. By the way, I did notice the fan runs for a little while after the refer has been turned off. I assume it is for temperature management.
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Old 08-03-2014, 04:18 PM   #9
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Quote:
Originally Posted by Javi View Post
The fridge wouldn't be installed in close proximity to the converter/power center would it?
I'm also beginning to think that the humming fan you hear is coming from your converter. Its fan can be heard at times when it is operating.
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