AC Issue

[Tim Fila]

I have 3 AC units on one pump. The front AC is giving me a HI PS error. It is also iced up. I turned the good units off and the bad unit still pumps water. I looked at the filter and I can see through it.
Any thing else I should look for?

Tim

 

[Jeremygavin]

It could be a water flow issue. You may need to flush the water lines going to the fwd unit. Make sure all the return vents that line the underside perimeter of the bed are not obstructed. Lastly, I had to clean out the cooling fins behind the filter on the AC unit on mine because it kept icing up 2 years ago.

 

[ocgrant]

90% of the time HP error is water flow
The other 2 causes of icing up is low Freon and or low airflow across the coil. I just had a unit ice up and it was low on Freon. Now still trying to figure out why since it is holding and no leak present.

 

[bbwhitejr]

One other thing that will cause it to ice up….if the humidity is high and the thermostat is set too low, it will ice up. The compressor needs to shut down occasionally for any ice to melt off.

Bennett

 

[Tim Fila]

It could be a water flow issue. You may need to flush the water lines going to the fwd unit. Make sure all the return vents that line the underside perimeter of the bed are not obstructed. Lastly, I had to clean out the cooling fins behind the filter on the AC unit on mine because it kept icing up 2 years ago.

There are no return vents under the bed.

 

[hughespat57]

90% of the time HP error is water flow
The other 2 causes of icing up is low Freon and or low airflow across the coil. I just had a unit ice up and it was low on Freon. Now still trying to figure out why since it is holding and no leak present.

@ocgrant the one place that is very hard to check for Freon leaks is the heat exchanger since its a tube in a tube.
If it loses gas again turn everything off, wait a while and then have them use a leak detector at the water overboard discharge. Any detection there indicates leak in the exchanger.

 

[Jeremygavin]

There are no return vents under the bed.

In my boat Around the whole perimeter of the bed where it overhangs the base is oval vents cut into the floor that the mattress sits on. These are the “return vents” for the ac. They let the air back into the air handler from the room.

 

[Tim Fila]

In my boat Around the whole perimeter of the bed where it overhangs the base is oval vents cut into the floor that the mattress sits on. These are the “return vents” for the ac. They let the air back into the air handler from the room.

I did find them! I had no idea...but they were not blocked. Next weekend, I'm going to run a bleach solution through the system and let it set for an hour or so. Hopefully that will increase water flow and be the fix.

Thanks for all the advice!
Tim