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Old 08-17-2017, 11:12 AM   #1
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Air conditioning weak

All of a sudden my Newmar motorhome air conditioning is noticeably less efficient, not anywhere as cool as used to be, definitely getting ac power. In tandem, the lights are dimmer somewhat inside the coach yet coach battery voltage good at about 11.5 volts. Connected to shore power. Other than cleaning ac filters, any suggestions?

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Old 08-17-2017, 11:46 AM   #2
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11.5 volts is a fully discharged battery !
I'd suspect low ac voltage shore power

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Old 08-17-2017, 02:04 PM   #3
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Thanks, I appreciate your taking the time and effort to reply. I had the Campground check their output at my site with a bolt meter and all is fine. The only thing I can think of that could cause this is that I ran the generator yesterday for quite a bit, hadn't used in a long time. Now I can't start it and lights are flashing inside RV, do have shore power
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Old 08-17-2017, 02:20 PM   #4
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Your batteries are not being charged.

This is a separate problem from your Air Conditioning problem.

Charging batteries are usually at 13.1 VDC or above.
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Old 08-17-2017, 02:22 PM   #5
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Makes sense
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Old 08-17-2017, 02:23 PM   #6
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Did you have a thunder storm lately that may have damaged both your Air Conditioning as well as the battery charger/converter?
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Old 08-17-2017, 03:01 PM   #7
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Try and listen to see if you can hear the compressor turn on or is it just the fan running? I've had that problem in the past and it just wasn't enough power coming into the coach...
Mitch & Laura
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Old 08-17-2017, 03:29 PM   #8
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Although A/C Unit fan/compressor run on AC Power you have to have GOOD DC Voltage for controls....thermostat, circuit board etc.
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Old 08-18-2017, 10:29 AM   #9
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When they checked the voltage at the pedestal, was the shore power still plugged in? I would also check the voltage at one of the duplex 120 volt outlets. These symptoms seem to point to low A/C input. Voltage below 100 will damage some of the equipment, including the roof air units.


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