Possible Cause
The envelope may have been feed incorrectly.
Solution
Make sure you slide the envelope flap under the blue edge of the moistener unit. If you don't, the moistener can't wet the flap. See Feeding Envelopes and Tape Strips.
Possible Cause
Low sealant level
Solution
Check the sight glass on the left side of the moistener tank. If the sealant level is low, add E-Z Seal® solution until it reaches the bottom of the fill hole, see Filling the Moistener Tank.
Possible Cause
Dry moistener brush
Solution
Try wetting the moistener brush. If the brush dries out quickly, replace the moistener wick, see Cleaning the Moistener Wick.
Possible Cause
Dirty moistener brush
Solution
Remove the moistener brush and rinse it thoroughly in plain water to clean, see Cleaning the Moistener Brush.
Possible Cause
Worn moistener brush
Solution
Replace the moistener brush, see Cleaning the Moistener Brush. Refer to the Pitney Bowes Contact List.