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I have an old Intertherm SCH-RV A series roof-mount AC on a houseboat. The blower fan did not come on today. What can I check before replacing the motor or entire unit?

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  • CHERYL JEFFRIES Jul 30, 2013

    I NEED 2 COVERS FOR AN AC/HEAT CEILING UNIT IN MY BOAT. WHERE CAN I GET THESE. HELP PLEASE

  • CHERYL JEFFRIES Jul 30, 2013

    FORGOT TO MENTION MY AC UNITS ARE INTERTHERM SCH-RV-A SERIES. SORRY BOUT THAT

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Run 120 volts straight to the motor wires . white-ground black=hi speed.

Posted on Sep 05, 2008

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1 Answer

How do I know if my intertherm sch-rv a series roof mount air conditioner has heat


The thermostat will have a setting for heat if the unit has a heater

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What causes a repetitive, rapidly repeating, hammering or slapping sound in my rv roof top ac?


It's sounds like a critter may have started to make a nest in the blower motor fan. I recommend trying to clean out the fan motor squirrel cage.

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Why is air conditioner freezing up


Hi Krystal. Not sure how old your AC is. But mine is 1988 Class C. My roof mount started today freezing up After being on only 1/2 hour or less.I took the cover off AC on roof and seen the cooling coil half full of ice building up. When It get fully packed with ice the inside air cannot pass thru coil to fan to recycle the cooled air back down inside RV.. I checked out this site.Fixya.It seems my AC may be blocked with dust in the cooling coil. So I cleaned it out with compressed air. You can buy a can of it in spray form at Wal-Mart.$5..Also FixYa suggested to change the air filters after you clean the coils. Take off cover in inside on ceiling and put new filters. Peferable ones that are able to breathe thru easly. Mine was pluged with dog dander and a bit of dog hair.. I may have to put my dog..in a bag...No I can't do that... But today and yesteday it was very hot and ******* the AC.. But I did attach a small fan under my AC to push more hot up into coils.. It did make a diference The coils started to thaw and drip water on roof.. But I still have to check freon pressure...I'm attaching a photo of my small fan It is only 5"across...Hoped that helped a little.......John, Cornwall, Ontario
7_7_2012_10_38_25_pm.jpg7_7_2012_10_39_02_pm.jpg7_7_2012_10_40_14_pm.jpg

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1 Answer

Intertherm ac roof top ac fan want turn


Try turning it by hand to make sure it isn't seized up. If it won't turn replace the motor. If it will turn, check the capacitor for the fan motor and replace if necessary. You can also verify you have power going to the fan motor.

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2 Answers

Fan not blowing in coleman trs rv roof air


well check a few things first....have someone remove the cover and reach in with a hand and try to manually spin the blade...free spinning?....then tell the person below to click in the on postion while someone views from up top.....is it humming? or even trying to spin?....if not check the fuse on the RV that protects the A/C unit.....good?.....now replace the capacitor ( it the silver or gray can looking thing that the motor wires run to) only the correct size will work w/o causing further motor damage.

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2 Answers

I have an old type roof top a/c unsure of the model or make no tags. It starts and runs for about 60 seconds then stops but the compressor still runs. I replaced the run capacitor with no luck.


You might try removing the cover on the compressor where the wires hook up and see if there is a little black overload, usually the common wire is connected to it and then there is a wire from it to the common terminal on the compressor. If you have one of these overload protectors they can get weak or the wire can be loose causing a high amp draw.

Jul 24, 2009 | Dometic Rooftop RV Air Conditioner

2 Answers

RV ac is vibrating


Take a good look at fan blade for a crack in one or more, as well as turn unit on & watch for vibration , then take a look at mount bushings on all items. Also with fan off (obviously) check shaft for movement, side to side, up & down, in & out. Your gasket between roof should only be compressed approx half it's original thickness. Some manufacturers tighten them down too much and can be a source of vibration as well. Not expensive or hard to change. Don't forget blower wheel as well.

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2 Answers

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I have a dometic duo-therm. The unit works great and fan blows strong and both high and low work., but air is coming out of the ceiling unit rather than the duct work. The bedroom unit works OK, but the air is strong out of one duct, and not much comes out of the others. The front unit only has air coming out on the A/C unit and none out of the ducts.

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