Lp hp cf error showinng in my 11ton blustar ac

Hi/low pressure fault.

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what is a blue start?
what is AC (alternating current)?
what is LP (line printer)?
what is CF (Cold Fusion)?
add some English nouns please.?
tell the service tag lines1, 3 and 5. and win a trip to Mexico.
as seen here.
http://partsurfer.hp.com/search.aspx

please post a problem.
tell what PC you have, exactly (service tag is best)
tell what printer you have exactly.
then post what dont work right, (symptoms clearly)
and what operating system the PC runs.

It appears you have lost part of the charge.

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How to Check Your Car Air Conditioning System
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Pretty picture - defusing an explosive device, perchance ?

Keep 1 post per subject open please! It is confusing to follow! The HP is High pass and LP is Low pass, HP is for tweeters and LP is for Sub woofers!

11TR Blue star Ductebal AC LP HP CF porbalem

after starting of ac units it shows lp hp but once reset than the lp hp thing goes away what is the reason for showing lp, hp in the morning when started first time in the morning