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Old 09-24-2019, 06:20 AM
  #4  
tedsander
 
Join Date: Jul 2004
Location: White Bear lake, MN
Posts: 142
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As others noted, most likely a battery problem, since it works with one. Does it work with the other?
Note that, at lease with some older models, the pressure switch can fail - it's just two pieces of sheet metal held apart by foam rubber. Squeeze and they make contact. It is easy to take it apart to inspect. Not your issue, but there was a frequent problem in at least early models, that the 24v would actually weld the plates together, resulting in "always on". Perhaps yours has the opposite - damage to the plates resulting in poor contact. But I'd suspect the battery first.....
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