Air conditioner error code P1 R5. What is this?

[Phasma]

I just downloaded the SMX ir manual. It states that the Hi Ps error code is either a water flow issue or an air flow through the condenser. I cleaned the sea strainer that only had a small amount of growth and back flushed the system with a hose. I then went down and vacuumed out the condenser coils. They had a large amount of dust and dog hair in the coils. The filter was partially clogged. So far all is well. The AC has been running for about 45 minutes with no error code.

 

[Phasma]

90 minutes and no error code. It is coolish in here. I seem to remember it getting cold enough to hang meat. It’s just cool. Maybe something to do with warm water temps and hot air temps?

 

[JVM225]

90 minutes and no error code. It is coolish in here. I seem to remember it getting cold enough to hang meat. It’s just cool. Maybe something to do with warm water temps and hot air temps?

If it’s flowing with no codes I think it should be cold.
Make sure you have good flow discharging out of the side of your boat. It should be pretty strong. I had the HI PS code on my forward unit until I flushed the system both ways with fresh water a few weeks ago and now you can hang meat in my cabin again with no more code. I must have picked up some muck crap in there.
I’m still not satisfied with my forward (7k) unit not pushing out the same amount of water as my salon (12 k) unit, but it is a clean uninterrupted flow.
Not sure if that’s normal or not, so I followed Rob’s advice and stuffed some bromine tablets in the strainer for good measure.
Both units have been working during some brutally hot and humid weather these last few weeks and I think the water temps around here are at least as high as where you are.
I literally have to wear a hoodie in the cabin if I set the controllers to anything less than 72 and close it up.
If you can’t access your discharge with the boat in the water then you should consider pulling the hose off the barb for it and flushing backward from there.
I disconnected hoses flushed from every point there is. This included removing drawers from a forward closet to gain access but it was worth it to make sure all was clear.
Also, poke something through the side discharge from the inside out while you have the hose off to make sure it’s clear.
The other thing you can try doing is resetting the controller. There is an outside chance that the temp you’re setting it for is not the actual temp it is shutting down the compressor.
Example: You set it for 72 but it is actually turning off at 76.

 

[Blueone]

I just downloaded the SMX ir manual. It states that the Hi Ps error code is either a water flow issue or an air flow through the condenser.

Who would have thought it could be an air flow problem???

Glad you are back up and going

 

[JVM225]

Bad air flow from a dirty filter in cooling mode can cause a Lo Ps error code.

 

[Blueone]

Bad air flow from a dirty filter in cooling mode can cause a Lo Ps error code.

If a condenser becomes dirty or fouled, less heat transfer can take place from the refrigerant to the surrounding ambient. Dirty or blocked condensers are one of the most frequent service problems in commercial refrigeration and summer air conditioning fields today. If less heat can be rejected to the surrounding air with an air-cooled condenser, the heat will start to accumulate in the condenser. This accumulation of heat in the condenser will make the condensing temperature rise. Now that the condensing temperature is rising, there will come a point where the temperature difference between the condensing temperature and the surrounding ambient (Delta T) is great enough to reject heat from the condenser.

Remember, a temperature difference is the driving potential for heat transfer to take place between anything. The greater the temperature difference, the greater the heat transfer. The condenser is now rejecting enough heat at the elevated Delta T to keep the system running with a dirty condenser. However, the system is now running very inefficiently because of the higher condensing temperature and pressure causing high compression ratios.

 

[JVM225]

If a condenser becomes dirty or fouled, less heat transfer can take place from the refrigerant to the surrounding ambient. Dirty or blocked condensers are one of the most frequent service problems in commercial refrigeration and summer air conditioning fields today. If less heat can be rejected to the surrounding air with an air-cooled condenser, the heat will start to accumulate in the condenser. This accumulation of heat in the condenser will make the condensing temperature rise. Now that the condensing temperature is rising, there will come a point where the temperature difference between the condensing temperature and the surrounding ambient (Delta T) is great enough to reject heat from the condenser.

Remember, a temperature difference is the driving potential for heat transfer to take place between anything. The greater the temperature difference, the greater the heat transfer. The condenser is now rejecting enough heat at the elevated Delta T to keep the system running with a dirty condenser. However, the system is now running very inefficiently because of the higher condensing temperature and pressure causing high compression ratios.

Since I know diddly squat about air conditioning and refrigeration I have to just read the code and refer to the manual for the system.
That manual tells me that if I get HI-PS in cooling mode it probably related to flow and like the screenshot of page 18 in the manual I posted above indicates, a dirty filter will likely result in a LO-PS code in cooling mode.
I got a HI-PS code on my forward unit a couple of weeks ago. Consulted the manual and followed Rob’s advice. Flushed the unit thoroughly, code went away, units works great now. Can hang meat in the cabin, so I’m a happy camper.
Sounds like you have more knowledge than I do so I’ll defer to you for anything more complicated than that.

 

[Blueone]

I say if it's high or low ...check the cleanliness of condenser and filter.... Your right there are a lot of reasons for Hi PS. I am not saying it's always cleanliness.... Just something else to check before you pay real money to have it looked at.