Great weekend on the water, however my a/c shut its self down during the night on Friday. Hearing every little bump in the night, I sprang into action and turned the unit off. Upon inspection I found the raw water pump to be dry. I had just changed impeller and hoses from intake to pump a couple of weeks ago. So I opened the impeller housing to diagnose and found it to be dry. So I primed the hose from the intake to the pump and fired her back up. All went well.... Unit ran fine all day, Saturday night. Same thing, however this time I turned the unit off and left it alone for a while as I was handling some bright work details. I went back to it about an hour later turned it on, and it was pumping again.

Not moving, boat was in slip the entire time ( as I have learned from SuperDisc, this happens while moving)

The unit is MarineAir HMH 700.

Any suggestions?

My other unit is down, the fan runs but the compressor nor pump kick on, so I went to dive into that one and just as luck would have it,,, the battery in my Fluke meter was dead,,, another day I suppose.

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Is the filter/strainer plugged?

Oops, I left that out. I checked strainer. I was clear but it was half full after the shut down.

It’s possible that you have an air leak causing it to lose prime. Or some gunk clogging the inlet? Is the impeller still ok after running dry? 

You likely have an an air leak which is causing an air lock. Since this just started with the new impeller and hoses, I would be checking the hose connections and fittings for a suction leak, assuming that your pump is located above the water line.

If your pump is below the water line, the you definitely have a restriction in the pump intake somewhere between the through hull, strainer, and pump.

Your other unit sounds like it is probably low on refrigerant.

That is the conclusion I have drawn as well. The intake nipple is 1/2", the water pump is 5/8" the intake at the unit is 1/2" I have had to make adapters for that and I really didn't like it. I will check the lines. Thank you all very much.

Yes it looks just fine.

Bruce Harkness said:

It’s possible that you have an air leak causing it to lose prime. Or some gunk clogging the inlet? Is the impeller still ok after running dry? 

Those pumps are deigned to push and NOT pull. The strainer and pump must be below waterline. Also make sure your strainer has a good seal (Oring) in it because if it sucks air, it won't pump. To verify its all mounted correctly, you should loosen the strainer lid and water should flow freely over the top. If it doesn't it needs to be lowered. 

Hi Lee, I just changed that O ring about a month ago, they are below. I am going to check for leaks this weekend. Thank you!

Lee H. Dahlen said:

Those pumps are deigned to push and NOT pull. The strainer and pump must be below waterline. Also make sure your strainer has a good seal (Oring) in it because if it sucks air, it won't pump. To verify its all mounted correctly, you should loosen the strainer lid and water should flow freely over the top. If it doesn't it needs to be lowered. 

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