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Old 06-28-2006, 03:26 AM   #1
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Air conditioner compressor doesn't sound like it is starting. Loud hum. Blower motor is not working either. Check control panel on airconditioner and found two large grey capacitors with one totally melted. Replaced both capacitors but still have the same problem as above. Any suggestions
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Old 06-28-2006, 03:26 AM   #2
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Air conditioner compressor doesn't sound like it is starting. Loud hum. Blower motor is not working either. Check control panel on airconditioner and found two large grey capacitors with one totally melted. Replaced both capacitors but still have the same problem as above. Any suggestions
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Old 06-28-2006, 04:42 AM   #3
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Destry, WELCOME to the iRv2 forum!!

One of our members will certainly be along with some timely advice to hopefully solve your problem.....We have several "certified" rv techs that frequent the forums, so I am confident
you will have an answer soon....
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Old 06-28-2006, 05:30 AM   #4
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Destry:
Air conditioner compressor doesn't sound like it is starting. Loud hum. Blower motor is not working either. Check control panel on airconditioner and found two large grey capacitors with one totally melted. Replaced both capacitors but still have the same problem as above. Any suggestions </div></BLOCKQUOTE>

Mine's in the shop now for similar problem, see my post on basement Air. This is the second time in less than a year that they're replacing the out door blower motor and circuit board. They even called Coleman to get an insight as to the failure and was told most likely a low voltage condition. I'm sorry I got the basement air, woould rather have the storage and I don't use the heat pump feature at all. Maybe the "RVGUY" will weigh in on this. He was very helpful in troubleshooting my problem.
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Old 06-28-2006, 07:39 AM   #5
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Thanks for this info. Have they been able to determine the cause of the low voltage.
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Old 06-28-2006, 08:03 AM   #6
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Most likely,,some Campground is the source of the low voltage. Be sure to use a surge guard at all times when plugged into shore power. Good Luck
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Old 06-28-2006, 08:46 AM   #7
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Destry:
Thanks for this info. Have they been able to determine the cause of the low voltage. </div></BLOCKQUOTE>

Here's the catch. I had it repaired last October. Never used it until the Friday before Memorial Day. I have a dedicated 30 amp outlet on my house just for the RV. Using that plug in, it failed in about an hour. I have the plug in Volt meter near the EMS board and it showed a constant 120. When the compressor would come on, the amp guage would creep up to 28-30, then in about 5 minutes, the compresser would shut down. The OD fan wasn't coming on at all. Thats when I found a few fried wires. The ID fan kept running and no fuses or breakers went off.
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Old 06-28-2006, 08:50 AM   #8
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by ichn2go:
Most likely,,some Campground is the source of the low voltage. Be sure to use a surge guard at all times when plugged into shore power. Good Luck </div></BLOCKQUOTE>

I know the Surge Guard will protect against spikes, but what about a low voltage condition?
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Old 06-28-2006, 09:47 AM   #9
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Can someone explain how the surge protector help against low voltage. Is this do to low voltage and then somehow get a spike when you do get full power. This also made me wonder if the problem could be do to a lightning strike. My MH is 75-100 feet away from my home with a dedicated 50 am breaker in the house. Could lightning hit the ground where the cable is burried and as a result cause problems with the air conditioner. I was running it for a while the day it quite and can tell it was working at one point since there was water on the congrete underneath the unit but by the time I went back out to check on it the fuse had tripped inside the coach.
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Old 06-28-2006, 10:12 AM   #10
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I have an EMS protector. It shuts down if voltage drops below 103 volts or goes over 132 volts. It also checks for polarity, hertz and open ground or neutral.
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Old 06-28-2006, 11:49 AM   #11
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I am not an engineer, but I think a spike or low voltage could cause the same problem. It works for both conditions. Do a Google search for Surge Guard, then go to their site for an explanation. Good Miles
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Old 06-28-2006, 12:57 PM   #12
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Destry,

I will try to assist you with functions of a "surge protector". Typically this device is a multifunction unit, providing control of high and low power levels, surge protection on the shore power line (and the generator if wired to do so), polarity checks, open ground, hot neutral and depending on the brand of unit it may provide a couple of more functions. Unfortunately they have become know as "surge protectors" and that is not really a correct term as they provide much more protection.

High and low power are computed from a plus/minus of 10% from the line voltage of 115VAC, or 103 to 126 allowable voltage. The device is therefore designed to allow any variance of voltage between these two values but will shut down if it goes below 103 or abouve 126. This may vary minutely by brand, but the function is the same.

Surge protection is obviously the protection provided against any errant spikes due to interference with the main power source. It doesn't matter what the interference is, lightning, line noise, power failures in some facility creating feedback spikes, etc., when the spike is sensed by the device it will shut down. These are measure typically in joules and time to operate, i.e. how fast can it shut off power to prevent damage.

To the question of what the effect of lightning can be a line; prior work that I performed in the pump industry identified the following information. A lightning strike 1/2 mile from a power pole carrying current for a submersible pump 175' in the ground can and did impact the pump with over 400,000 volts of surge. Of course it is dependent on many factors, but lightning is a very powerful source of energy and it is very high voltage.

One thing that strikes me about your description of your home setup; 75-100 feet away from the plug is a very long distance to run a 50 amp service and even longer to run an extension cord. If you have a plug that is 75-100 feet away from the breaker, please have it checked to insure it has sufficent wire size to prevent low current to your rig. If you are using an extension cord, you want to re-evaluate that immediately. The problem with distance is that the further you try to go, the more power loss you have. The effect on your system in the coach is that the lower the power you have, the more it requires in amperage to run the item (AC in this case) and the effects can be identical to what you have already experienced.

Hope this has been worth your time to review, if I can be of any further assistance, please don't hesitate to contact me.

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Old 06-29-2006, 02:19 AM   #13
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Would the melted(like a candle)starter capicitor be a symptom of power surge or low power. I believe the power line is the right size as I checked with an electrical supply shop when I bought it, but I will double check. What is one of the best surge protector or power monitor on the market? Any ideas on what might be causing the symptoms I described on my basement unit? Outside fan doesn't come on and it doesen't sound like either compressor is starting. It sounds like the compressor is locked up, it makes a deep humming sound. Could it be that the compressor isn't working because the outside fan isn't coming on?
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Old 08-08-2006, 08:19 AM   #14
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I have an 04 Winn Adv 35U with basement air. I just tried to run ac and of course when you need it most, it's not working. The symptoms are identical to those described in other posts. The compressor kicks in, but the OD fan does not start. This causes the compressor to overload and shut down. I got under and noticed that the OD fan is very difficult to turn. You can access it through the wire mesh under the unit. Once I freed it up, everything worked fine until the next morning and here we go again. The OD fan appears to be the culprit. What I need is some information on how to drop the ac unit, replace the OD fan and put it back together. All the electronics appear to be working just fine. It just seems to be a fan issue.
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