High head pressure (HI/PS) error

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hperros
Posts: 31
Joined: Mon Oct 30, 2017 10:16 pm

High head pressure (HI/PS) error

Post by hperros »

I have a Dometic Cruisair system, and after running it for about 9-10 hours it shuts down with the HI PS error. I have cleaned out the air filters and the sea strainer, but the problem continues. The water pump does not feel hot when the error occurs. The system restarts after some time. Any ideas?
Harry Perros
Aegean
Hull #331

Capt. Nini
Posts: 19
Joined: Tue Feb 27, 2007 11:38 pm
Location: Gatesville Tx

Re: High head pressure (HI/PS) error

Post by Capt. Nini »

Try disconnecting the hose from the sea strainer to the pump and connecting a hose to it and flush out the system under pressure.
I have had to do this twice in 13 years. Especially bad in areas of high algae growth.

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digitalvillager
Posts: 32
Joined: Mon May 14, 2012 1:23 pm

Re: High head pressure (HI/PS) error

Post by digitalvillager »

If you are keeping the thermostat set below 70 and the seawater temp is above 85, you will have this problem. If this is the case, move your thermostat up to 75 and then after your 10 hour threshold, try moving it down to no lower than 73.
Charlie & Jeanne Monroe
Quit In Time
Hull #285
Amelia Island, Florida

hperros
Posts: 31
Joined: Mon Oct 30, 2017 10:16 pm

Re: High head pressure (HI/PS) error

Post by hperros »

Thanks for your suggestions. I also talked to an a/c guy and he said that it maybe the head pressure switch, if the pipes are not frozen when the error occurs. Anyway, I have plenty of ideas to try out next time I go to my boat.
Harry Perros
Aegean
Hull #331

hperros
Posts: 31
Joined: Mon Oct 30, 2017 10:16 pm

Re: High head pressure (HI/PS) error

Post by hperros »

This problem was finally fixed, and I thought I would post this to the forum in case someone may have similar problems. I tried all the remedies to make sure that water and air was not being blocked, but It kept giving me the same HI/PS error at random times. However, after turning off the system, it would restart immediately. This went on until a month ago when it gave up. That is, it would start, run for a couple of seconds, and then display the HI/PS error and quit. If I turned it off and then restarted it, it would do the same. I was advised to replace the water pump (which costs $450 !! - I don't know why it is so expensive), but it turned out that it wasn't the pump. So, I had to call the experts. The a/c guy hooked up the system to his computer, and could not find anything wrong after much searching. He was about to give up, when he discovered that a red live wire had melted on another wire. I am afraid he did not explain to me on the phone which hot wire that was. Apparently, it was not a wire that one can spot easily. For some weird reason it gave the HI/PS error. So, a happy end after many billable hours .. and a working water pump I don't need. Looking back, I could have avoided getting a new water pump, by hooking up the pump directly to an ac plug and observe if water was coming out of the boat. Unfortunately, I did not think of it at that time. Anyway, you cannot always win!! If anybody wants a second-hand pump, please let me know.
Harry Perros
Aegean
Hull #331

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