AC System HFP Code on One AC Unit

[Lou Skyking]

I have a 396MY with three AC Units. Yesterday when i turned on my units I received HFP on all units after they ran for an hour or so. So I cleaned the sea strainer ( just cleaned it a week ago). The strainer was clean...so i thought I had buildup in the ac discharge lines. Flushed with fresh water with pressure from water hose. Now the forward and rear unit are working fine and the one in the Salon will work for a few mins and then get the HFP code again....getting good stream of water from discharge...any and all help appreciated

[Viper]

Is the evaporator filter and evaporator itself (fins) clean?

[Lou Skyking]

Yes sir....all is clean...im considering flushing the water system with some kind of cleaning solution ...what do you think...as i understand it the coil is a copper line within a copper line.

[tomschauer]

HPF is high pressure fault. In the cooling mode it means you are not moving enough water. Try isolating and flushing the water side of the problem unit. That should fix you up.

[mjk1040]

U said all 3 units went to HPF, thus all three units have one thing in common the lake water pumping thru them to cool the condensers. IMO I think u r on the right track, u need to flush the system. Look up the Utube video by Sea Flush on cleaning the AC cooling system. Simple use of white vinegar or CLR may solve your issue or u may have to go with a DeScaler.

[StDuckie]

Hey Lou, I have an identical problem on my aft unit on my 3706...did you solve your problem, and if yes how did you do it?