Question about Coleman Mach III Air Conditioner

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My roof top unit is letting the condensation run into the coach.

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Either you need to replace the square gasket between the ac and the roof or you need to seal/replace your roof..

Posted on Aug 05, 2010

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Posted on Jan 02, 2017

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Hi i have a roof top LG LS- k1830 HL 18000/19000btu heat & cool mini split air conditioner. my ? is the condenser fan wont run and the after the unit is on for a while the high pressure line does...


the condenser fan will start as soon as the compressor turns on( that is the outside unit)
the inside fan will run regardless if the compressor is running or not

Jul 15, 2017 | LG LS-K1830HL Heat Cool Mini Split Air...

1 Answer

When set at coojest setting, water begins to pool on roof of my motor home


It is normal for water to come out of your unit. On some units there is a drain line if you take the top off of the unit you will see the line hooked to the condenser side (cold) of the unit. But most units just let water run out on the roof and run off. Your unit may have settled or if you have applied a sealant on your roof you may have changed the flow of the discharged water. The water is moisture that condenses from the air inside your rv. This should not cause you any problems unless you have a leak in your roof.

Aug 08, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a coleman Mach rooftop unit & want to connect drain tubing to carry condensate away. Is there a small drip pan with a tubing conncetion for this?


If all you want to do is re-route condensation dripping off the roof, and it's a rubber roof, one easy way is to buy a caulking tube of "Dicor" self leveling sealant for rubber roofs from RV dealer, and run a 1/4"-3/8" bead across roof from AC to wherever you want it to go, and let it cure for a couple of hours. Nobody sees it, and a tube is about $10 max.

Jun 09, 2010 | Coleman Mach III Air Conditioner

1 Answer

Roof top A/C cover removal


The covers just have screws that go from the top down through that hold them on. Once the screws are removed the top cover should come off the bottom I am not sure about the bottom one the whole unit may have to come off for that one.

Jan 13, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

My coleman 13,500 roof a/c year 2000 does not blow as cold as used to. I have cleaned the top condenser coils, with no help. It also at times will seem to pull a heavy load when I assume the compressor...


if the compressor started and stoped means
1 thermostat need settings
2 compressor over heated due to low suction pressure need to check and repair the leak then charge the freon

Sep 14, 2009 | Coleman Mach III Air Conditioner

1 Answer

The rv is setup on concrete. I have leveled the unit. The condensate is draining on the roof on both sides. I want to direct the condensate to the rear of the unit. Can I place a drain tube on the A/C unit...


What I've done in the past for some owners is run a bead of "Dicor" sealant across roof to where it's better to run off. Condensation follows bead to new location, provided it's not running up hill.

Aug 17, 2009 | Heating & Cooling

1 Answer

My motorhome roof top aircondtioning unit is leaking (drip) inside the motorhome. Everything looks ok, what would cause this?


Chances are that you have apluggage inthe condensate drain line. Dirt dobbers just love to nest in them, as do other critters. Locate the drain line either on the top, or on the side of the coach low, and clean the drain with a piece of electrical wire (#12, solid), or a nozzle on a garden hose. Repeat from the other end.
Best regards, W/D

Aug 16, 2009 | Heating & Cooling

1 Answer

Coleman 1300, condensation buildup inside unit, ceiling wet


Check for plugged drains under cover on roof, sticking out at base of unit usually. It should be running off roof.

Aug 04, 2009 | Heating & Cooling

1 Answer

2000 roof-top Brisk-Air


I think you have a high pressure cutoff cycling the compressor on and off. Clean the filter inside the unit. Then with a hose clean out the foil condenser filter on top of the camper. Also you may need to buy a coil comb and comb out bent or damaged areas of the condenser coil on the unit that is above the roof of the camper.

Jun 09, 2008 | Dometic Rooftop RV Air Conditioner

1 Answer

Trane HVAC Unit


If your condenser blow air up through the top of the condenser and you are concern about rain water affecting the unit.

You can install a roof or rain hood about 4ft above the unit to keep the rain off, The unit must be able to blow air off without causing Hi head pressure to affect the unit, The condenser must breathe or desipate heat freely.

Tell me if your question answered or if it works for you.

Mar 31, 2008 | Heating & Cooling

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