avatar: Wes
1 posts
Replied to Wes post on September 21st, 2012

When we turn the unit on an alarm sounds and a PWR message flashes.

Alarm sound stops.  Vacum and temp settings work.

What is this alarm about?

Also, the power switch does not always turn on.  May require you flip it on 1 or 2 to get pwr.


avatar: Glenn PICKETT
72 posts
Replied to Wes post on September 27th, 2012

Hello Wes,

The STOP signal and beep are usually accompanied by another message.

If you send me your e-mail address, I'll send you the Troubleshooting pages from the User Manual for the L8-70.

Hope this will help you.

avatar: davidheise
7 posts
Replied to Glenn PICKETT's post on April 15th, 2014

This is indicative of a defective power circuit breaker.  The breaker, over time, will get "spotty" and not make a good solid contact.  The beeper indicates that a power failure has occurred and less than 30 seconds have elapsed since the power was re-established.  

Remove and replace the circuit breaker (not easy as the console and all in it must be removed first.)  The Airpax part number should be printed on a label on the side of it.  Replacements can be ordered from

avatar: Kirkshirley
3 posts
Replied to Wes post on March 11th, 2016

This is a nusance error,  the instrument has detected a glitch on the powerline. 

There isn't  much you can do except using  a UPS.  If it happens during a run the insturment will display the error but keep running.

I can go into some rooms with L8s and they all are displaying Pwr.

So, just ignore.



avatar: davidheise
7 posts
Replied to Kirkshirley's post on March 12th, 2016

This is a reply for Kirkshirley......there are times when a power drop will cause this to happen but if it occurs WHEN THE CIRCUIT BREAKER IS TURNED ON, the breaker is defective.

And by the way, it is not recommended by the manufacturer to use a UPS - we're talking 208 V here.

This particular problem is much more than a nuisance, its a real problem; I outta' know, Ive worked them for 45 years.

avatar: dpkleessr
926 posts
Replied to Wes post on March 12th, 2016
As an aside to Dave's response, someone who I worked with many moons ago, there were also issues with the power cord and line filter that it connected to. They need to be checked periodically for loose connections because after awhile, the components that are part of the filter crap out from poor connections and internal arcing. If you can easily rotate the connections on the line filter then you probably are going to having issues with it sooner rather than later. Don
avatar: Alfachem
5 posts
Replied to dpkleessr's post on March 16th, 2016

Thanks for the detailed explaination.