Air conditioner error code P1 R5. What is this?

J

Jeffrey R. Dubin

New Member
Jul 23, 2018
2
Boat Info
2005 searay Sundancer 45
Engines
Twin Cummins 480 HP
Does anyone know what the error code P1R5. Mean. Running the master cabin air conditioner for about 15 minutes then it shuts off and displays P1R5 code?
 
I don't know of any such code. The SMX II reports LO PS, HI PS, and LO AC. Might it be one of those?
 
Thank you for the quick response. I’ll recheck. I believe it was alternating from P1 to R5.
I’ll r check tomorrow. Thanks.
 
So its water flow issue. pump not running strainer clogged , inlet obstructed.

so u have some home work, check the pump operation first. See what's peeing out the side

Rob
 
If it is Hi PS, check to see if the unit is frozen over. Happens every now and then on my boat. Apparently if you set the temp to far from the actual temp, for example, its 80 degrees outside and you set if for 55 (or coldest setting) this can cause it to work extremely hard and freeze the unit over. If its 80 out i set mine at 65 or so. It seems to work for me.
 
I just had this problem with the forward unit two weeks ago. I looked at flow at first ...it turned out to be a clogged air filter that's up against the evaporator. It was cleaned at the beginning of the season so not sure how it got so clogged. Cleaned it and its been fine ever since.
 
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Guys , His issue is High pressure not low pressure. Ice , dirty filter , iced up unit all cause low pressure failures... Water flow is issues are all high pressure .

Rob
 
I am just telling you what happened with my HI PS alarm. Take it for what its worth or ignore it.. you get to choose. Two weeks ago I couldn't keep it running for an hour... I looked at flow which was the same ...looked at the strainer it was clean... pump was pumping both AC units the same...cleaned a very dirty air filter and it's been running 24 hrs a day ever since.
I am not saying this is without a doubt going to solve his problem. I am just sharing an experience. How I understand the system to work is the HI PS is actually a High temp alarm. High internal temperature of the unit is determined by the change in pressure ...the hotter the unit gets the higher the internal pressure gets until it trips the alarm "HI PS"....High temp can be caused by water flow or lack of it, clogged evaporator or a dirty filter.
 
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Blue , no reason to get heated. Just trying to stop misinformation. HI ps is directly linked to a High pressure switch. ITs not a temp sensor . ITs a pressure sensor. a clogged filter makes the evaporator coil ice up decreasing air flow causes the coil temp to drop like a rock and the refrigerant pressure to drop. Eventually it goes off on low PSI. maybe ur leads are reversed on ur control board.

Rob
 
Rob... I am not heated... my blood pressure is getting a little high...which is making me a little hot :) seriously we are close

When the temperature of the unit starts to rise so does its internal pressure. The pressure sensor senses the rise in pressure and shuts the unit off.

Jeffery ....as a routine PM ..not because of your problem :) ....take the filter media out and if it's nylon just hose it off and dry it and check the evaporator to make sure its clean.
 
Robski97 said:
Blue , no reason to get heated. Just trying to stop misinformation. HI ps is directly linked to a High pressure switch. ITs not a temp sensor . ITs a pressure sensor. a clogged filter makes the evaporator coil ice up decreasing air flow causes the coil temp to drop like a rock and the refrigerant pressure to drop. Eventually it goes off on low PSI. maybe ur leads are reversed on ur control board.

Rob
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I agree! Was getting that HI PS code on my forward AC. Manual told me it was a flow problem.Removed that line from the pump, put hose adapter on it temporarily, then flushed it with fresh water pressure from the dockside hose for a while and no more HI PS code. Going to follow up with Barnacle Buster at some point just to be safe.
 
JVM , If the boat was always here in NY . Don't do Barnacle buster. Fresh water at pressure is fine . If u think u have growth which I doubt its usually just mud from the sand box throw some bromine tabs in the strainer basket for 2 weeks then flush again with water. I moved the pump and the splitter to the after part of the ER . much easier to access.

Were out in riverhead... Tons of much in the water. The bromine tabs work great.

Rob
 
Robski97 said:
JVM , If the boat was always here in NY . Don't do Barnacle buster. Fresh water at pressure is fine . If u think u have growth which I doubt its usually just mud from the sand box throw some bromine tabs in the strainer basket for 2 weeks then flush again with water. I moved the pump and the splitter to the after part of the ER . much easier to access.

Were out in riverhead... Tons of much in the water. The bromine tabs work great.

Rob
Click to expand...

Thanks Rob, I’m going to give the bromine tabs a try. This is just my second season with the boat. It came from eastern Connecticut though so conditions were probably similar. It probably was just some mud.
I’m going to swing by Home Depot and pick some up.
How many should I put in the strainer basket?
Will they hurt the plastic strainer basket?
 
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Ive been doing it for about 10 years . Went tru one basket so far. ( the plastic failed at the base of the basket. ) Depends on the size of the tabs . I fill it to the top. I also leave the boat in dehumidify mode.
 
Is the seawater pump shut down completely or will it restart? Mine shutdown completely and first thing to check was the strainer basket. It was clean. Difficult to check the motor spin but fortunately it turned out to be the capacitor.
You might not have the same 240V motor but it's easy to check the capacitor with an ohmmeter. The replacement part is specific and mine was only $8.62 off Amazon. Cheap fix, works perfectly again.
 
Thanks, I’ll fill the basket up and run it a lot for the next few days.
The fresh water flush got it going good with no more hI PS but the Bromine is probably a good idea for preventative maintenance.
 
Sounds good! The tablets were a little smaller diameter than the inside of the basket so I didn’t have to break them up. I put 4 of them in. Probably could have put 6 in but started with 4 since both units have been working well since the fresh water flush.
Should start smelling like a hot tub soon. Lol!
I’ve got them both cranking now with the cabin closed up. Humidity is nuts this past week or so. Sweating like crazy after just 5 minutes in the bilge. Luckily the two AC units cool the cabin off really quick. In another half hour I’ll need a hoodie in here. ☃️
Thanks for the tips!
 
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