FP PostBase One Operator's Manual page 139

Issue
...
with automatic sealing
Envelopes are not sealed.
Envelopes are not properly
sealed.
Possible cause and remedy
Sealing function is disabled.
Turn the envelope sealing switch to the position
SEAL (see chapter 3.6, page 21).
Sealant tank is empty.
Fill the sealant tank with 'sealit' sealing liquid
(see chapter 15.9, page 123).
Stroke your hand firmly over the envelope's / letter
stack's flap area.
Sponge is too dry.
Pump sealing liquid into the moistening unit:
M M
ENU OISTENER
chapter 14.15, page 98).
Sponge is dirty or worn.
Clean or replace the sponge (see chapter 15.10,
page 125).
You have used unsuited envelopes.
Only use envelopes that are suited for sealing by
machine.
Observe specifications (see page 182).
Adjust moistening (see chapter 14.15, page 98).
Use the special 'sealit' sealing liquid available from
Francotyp-Postalia.
Tips for troubleshooting
(see also
S P
TART UMP
139