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Old 04-28-2014, 12:44 PM   #1
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Refrigerator Problem

My refrigerator unplugged from AC with shift to gas while the motorhome is connected to shore power. When the motorhome is disconnected from shore power and the ignition turned on, there is no 12 volt power to the refrigerator. I can't seen to find the problem..
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Old 04-28-2014, 01:20 PM   #2
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The 12 v power should be available whenever the house batteries are connected. Are you turning off house power when driving?
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Old 04-28-2014, 01:22 PM   #3
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12v master switch turned on?

While plugged into shorepower your converter supplies 12 volts to the coach. Unplugged it goes straight to battery power. If the main switch is turned off your house batts won't be able to supply power for a fridge board.

Consider populating your profile with make and model for troubleshooting.
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Old 05-01-2014, 02:49 PM   #4
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The only reason it would shift to gas while plugged to shore power is that the fridge circuit board isn't seeing the 120vac power. That says either the supply circuit has no power (tripped breaker or broken wire) or the fridge circuit board isn't sensing it properly.

120v is used only to run the electric heater that makes the cooling unit work, so it has nothing to do with your 12v issue. However, the 12v must be present at all times to power the circuit board, whether in electric or gas mode.
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Old 05-01-2014, 03:05 PM   #5
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Quote:
Originally Posted by Gary RVRoamer View Post
The only reason it would shift to gas while plugged to shore power is that the fridge circuit board isn't seeing the 120vac power. That says either the supply circuit has no power (tripped breaker or broken wire) or the fridge circuit board isn't sensing it properly.

120v is used only to run the electric heater that makes the cooling unit work, so it has nothing to do with your 12v issue. However, the 12v must be present at all times to power the circuit board, whether in electric or gas mode.
I agree, but would add that it could be a tripped GFI. With a multimeter, you'll need to check for 120 v at the back of the refrigerator. Make sure the 120 v AC is coming from shore cord or generator, not an inverter.
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Old 05-03-2014, 05:40 PM   #6
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Note that if he has no 12v power to the fridge, it won't run at all, in any mode. No interior lights or operator control panel operation either. The circuit board requires 12v to run.
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Old 05-03-2014, 06:34 PM   #7
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Check the fuse on the outside circuit board.
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Old 05-04-2014, 07:03 AM   #8
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Quote:
Originally Posted by R1Kirby View Post
My refrigerator unplugged from AC with shift to gas while the motorhome is connected to shore power. When the motorhome is disconnected from shore power and the ignition turned on, there is no 12 volt power to the refrigerator. I can't seen to find the problem..
Did you work it out? If so, can you share with us what the problem was?

Bruce
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Old 05-07-2014, 08:41 AM   #9
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Check the fuse on the outside circuit board.
Every once in a while, my refer quits...it's always this 10 amp fuse.
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Old 05-07-2014, 09:45 AM   #10
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If all the power checks out it could easily be the control board for the fridge. They are easy to replace but not cheap to buy, so it's kind of a last resort. I had to replace one on a Dometic waaaaay back when on a 70's model RV. That board was only about $100. And I've replaced a couple of absorption cooling units as well - now that's a big job.
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