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How do you change the battery in a HPM 645/3 smoke detector?

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: How to change the battery in my SCO5RVA smoke and

Not obvious, and th emanual is not too precise about this as you probably know.

What I did on mine: take it off its bracket, flip it over bottoms up. You will see a part of the "rim" curving slightly out, that's the battery cover lid.

It is a very tight fit; to make things relatively easy, rotate the unit with the bottom still facing up until the curved part is on the right of the unit. Make sure there is no (red, if I remember correctly) peg locking the compartment closed, then insert your right thumb in there, and pull out. The battery compartment will eventually slide out part of the way. Remove the battery by pushing them out from below the battery compartment; they are on two separate blades that can be used to push them out.

Shoudl do the trické

Posted on Aug 07, 2010

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joeguest2
  • 2080 Answers

SOURCE: smoke detectors keep saying low

Occasionally these units can malfunction due to a buildup of dust inside which can interfere with the smoke sensor. Try opening the cover to the smoke alarm and vacuuming out the dust, or better yet, get yourself one of those cans of compressed air that are used for cleaning computer keyboards and thoroughly blow out all the dust.

Just to be certain, you can always test the new battery with a voltmeter to ensure it is in good condition before you put it in the detector. If you buy the really cheap brands of batteries, you will sometimes get one that is dead right out of the package.

Once you have inserted a good battery, try activating the smoke alarm using the TEST button.

If the smoke alarm continues to beep unnecessarily, then it is likely an internal fault and it's simply time to replace the unit with a brand new one.

Please comment back here to this page if you have any details to add, have any questions, or just require further general assistance and I will respond as soon as I see it.

I hope that was helpful to you, good luck and take care.

Joe

Posted on Aug 04, 2011

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