Air conditioning Hi P5(PS)

[Bsouth29]

Hey everyone, we’re getting, Hi p5(pS) on our air conditioning for our 2006 290 sundancer, fresh water boat running off shore power, single air conditioner.

I’ve flushed the entire system, cleaned the strainer and have also installed a brand new AC pump.

The AC just randomly decides to quit. I can’t figure out why? What am I missing? It will work/ flow great for days, then the next day it throws a code and keeps doing it over and over. Then randomly will work fine again.

 

[DrPringle]

Losing prime ?
Stick a vacuum on the discharge port

 

[ttmott]

I had that issue as well as the boat slipped behind me. It ended up being incorrect high pressure switches on the high end of the compressor. Dometic has had problems with the pressure switches; they were installing R22 switches in R410 systems (they operate at different pressures). Both of our systems are new and was a known issue. But quite possibly your issue may be the pressure switch is failing. Cheap and easy to change.

 

[Bsouth29]

I had that issue as well as the boat slipped behind me. It ended up being incorrect high pressure switches on the high end of the compressor. Dometic has had problems with the pressure switches; they were installing R22 switches in R410 systems (they operate at different pressures). Both or our systems are new and was a known issue. But quite possibly your issue may be the pressure switch is failing. Cheap and easy to change.

I was thinking it must be a switch/ sensor as well. I’ll have to look into it. Thanks so much!

 

[brewster16]

I'm assuming you have already confirmed the air conditioner is discharging overboard?

 

[Bsouth29]

I'm assuming you have already confirmed the air conditioner is discharging overboard?

Yes discharges great when it’s running, will run great/flow for days then shoots a code. I’m going to look into a new switch like tmott mentioned above.

 

[brewster16]

Sounds like it could be a solution. But, maybe you should speak to customer service at Cruise Air dealer first before you start throwing parts at the problem?

 

[Jaybeaux]

Are you sure that the hose back from the strainer down through the thru-hull is clear? In other words, a clog can exist from the bottom of the hull and in the hose "before" the strainer. A good practice is to use a shop vac and "blow" backwards from the strainer down through the seacock. When clear, you can hear the bubbles under the boat. I'd try that simple "fix" prior to switching out pressure sensors.

If you haven't seen it, a company called Sea Flush makes a great gadget for this exercise. https://www.amazon.com/Sea-Flush-Kit/dp/B071KZG27L

Jaybeaux

 

[Skybolt]

Are you sure that the hose back from the strainer down through the thru-hull is clear? In other words, a clog can exist from the bottom of the hull and in the hose "before" the strainer. A good practice is to use a shop vac and "blow" backwards from the strainer down through the seacock. When clear, you can hear the bubbles under the boat. I'd try that simple "fix" prior to switching out pressure sensors.

If you haven't seen it, a company called Sea Flush makes a great gadget for this exercise. https://www.amazon.com/Sea-Flush-Kit/dp/B071KZG27L

Jaybeaux

To @Jaybeaux's point, I'd also or in leu of, use a hose to make sure the thru-hull is clear. You can't see water volume.