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Old 07-26-2015, 09:11 PM   #1
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Forest River 3171DS AC Not Working

I have a 2014 Forest River 3171DS that has less than 7,500 and the roof mounted AC is not turning on. The RV has been in storage for at least a month without being used/started. I started it today, turned on the generator and turned on the battery bypass (so the generator could charge up the batteries). I let the generator run for 5 minutes, and then I turned the AC thermostat to cool. Nothing happened. I cycled through the settings and nothing. I tried just the fan and still nothing. I checked the circuit breaker to make sure it wasn't tripped. I checked the roof to make sure it wasn't damaged or vandilized, but it appeared ok. I turned everything off, and let it sit for 5 minutes and tried again. I'm new to RVing and I've only owned the unit for a year... So, I'm hoping the unit isn't broken, but that I'm missing something. Any ideas?
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Old 07-26-2015, 11:03 PM   #2
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Can you plug in to power rather than run your generator?? Have you checked your batteries --- how do they check?? What's the volt reading??? If they're low, charge them up first.
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Old 07-26-2015, 11:13 PM   #3
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Quote:
Originally Posted by dburlison View Post
I have a 2014 Forest River 3171DS that has less than 7,500 and the roof mounted AC is not turning on. The RV has been in storage for at least a month without being used/started. I started it today, turned on the generator and turned on the battery bypass (so the generator could charge up the batteries). I let the generator run for 5 minutes, and then I turned the AC thermostat to cool. Nothing happened. I cycled through the settings and nothing. I tried just the fan and still nothing. I checked the circuit breaker to make sure it wasn't tripped. I checked the roof to make sure it wasn't damaged or vandilized, but it appeared ok. I turned everything off, and let it sit for 5 minutes and tried again. I'm new to RVing and I've only owned the unit for a year... So, I'm hoping the unit isn't broken, but that I'm missing something. Any ideas?
Is it Dometic? They seem to be having problems recently. My neighbor just had his exchanged, 3 months old. Have seen numerous on here (forum) also.
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Old 07-27-2015, 12:46 AM   #4
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Hi VinceU, yes it's a Dometic thermostat. Are these thermostats going bad?
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Old 07-27-2015, 12:48 AM   #5
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I don't have access to plug it in to power. The batteries are at about 1/3 charge. But I thought the AC would turn on when the generator was running - even with low batteries. Do the batteries need to be at full capacity?
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Old 07-27-2015, 09:12 AM   #6
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I don't have access to plug it in to power. The batteries are at about 1/3 charge. But I thought the AC would turn on when the generator was running - even with low batteries. Do the batteries need to be at full capacity?

Yes they must be close to 12 for thermo to work. With Gen. on they should over 12 volts with charging current are breakers closed on gen control panel. Anything else like microwave work with gen on? A few other appliances need 12 VDC to work with AC power.


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Old 07-27-2015, 01:44 PM   #7
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Alot of them the freon wasn't up to specs. I have a 2014 FR Sunseeker. It worked a little first year then went south on. They have a two year warranty.
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Old 07-27-2015, 01:47 PM   #8
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Easy to check termostat does the furnace come on?
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Old 07-27-2015, 03:46 PM   #9
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We have a 2015 Sabre, bought in December. Ran the living room AC for 3 months in Florida. Everything fine. Camped a weekend in June and its running luke warm, second campout, luke warm. The compressor was shot. Under warranty, replaced with a brand new AC!! Works fine, end of story (I hope!).
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Old 07-27-2015, 04:22 PM   #10
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You might check the compressor fan on the unit. In humid conditions, rust can form on the shaft causing it to bind up. Mine has done that a couple of times. WD 40 and spinning it by hand frees it up nicely.
When it is stuck, the a.c. will hum but will not move air.
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