Surging hum near fridge in stored FC28

[kathrynlord]

Our 2011 FC 28 has been stored for about a month, plugged into 15 amp. Just checked inside and there is a fan cycling on and off. It is loud and sounds like it is in the fridge. It churns. The fridge is turned off, doors open. Unplugging from shore power turns off the hum, but the batteries seem to be drained. When plugging the power back on, the fan noise does not come on again until I hit the "store" switch. Then it will not go off unless it is unplugged from shore power. The temp inside the trailer is 82, outside temp 78, it is a sunny day and the sun is currently hitting the side of the trailer the fridge is on. Is this because of the heat, is it necessary? Has it somehow drained the batteries? Is it something to worry about?

[ROBERT CROSS]

Sounds like the converter/charger cooling fan is running full time.
The batteries have been overcharged, boiled dry.

IIWY...I'd get a new 3 or 4 stage converter, and new batteries.

The new converter will prevent the batteries from overcharging when plugged in for extended periods.

Randy @ Best Converter is a good place to start your research, very helpful and won't steer you rong.

At the very least you'll probably need new deep cycle batteries and then test the converter for output.

Bob

[kathrynlord]

Thanks, Bob, for the quick advice. Sounded right, but my husband thinks he has figured it out, and I'll have him write it out here:

Turns out that there is a fan underneath the refrigerator that helps to cool the compartment. The thermostat must have gone bad; the motor even ran during the night when the temperature in the compartment was very cool. Looks like other people have had this problem, and in the AS manual they suggest turning it off temporarily if it is cool and the fan noise is bothersome. So...thanks for your help, luckily it is not a serious problem.