Service and Maintenance
40H Series Service Manual
6–7
TROUBLESHOOTING
This table summarizes the possible causes for certain lock problems.
For problems
with the core and key, such as difficulty removing or
inserting the key or difficulty turning the key, see the
Core and Key
Service Manual
.
You notice… Possible causes include… You should…
Knobs or levers won’t turn.
Inside knob or lever does not remain
unlocked.
Outside knob or lever won’t lock.
Outside knob or lever droops.
Key will not operate latch or deadbolt.
Core will not install.
Deadbolt will not or is difficult to
retract or extend.
Deadbolt on deadbolt-only function
will not extend.
Deadbolt on deadbolt-only function
will not retract.
Lock does not function properly.
Handing is reversed.
Handing is reversed.
Spindle has been twisted.
Change the handing (pg. 6-2).
Change the handing (pg. 6-2).
Replace the spindle (pg. 5-16).
a. Incorrect cam has been installed. a. Install cylinder with proper cam
(pg. 5-20).
b. Cam has fallen to an inverted b. Rotate the cam to the home
position. position with a mortise wrench
before installing the core.
Cam has fallen to an inverted
position.
Trim is out of alignment.
Rotate the cam to the home position
with a mortise wrench before
installing the core.
Loosen the trim and realign it so that
the deadbolt does not bind.
Lock was ordered as an RD function. Check the part nomenclature and
ensure the RD function is needed for
the application.
Check to ensure the case and thumb
turn cylinder are the correct
handing for the door. If not, order the
correct case and thumb turn
cylinder.
Configure the case to the desired
function (pg. 6-5).
Handing has been ordered
incorrectly.
Universal case is
incorrectly configured.
a. Spindle is not backed off.
b. Trim is out of alignment.
a. Unscrew the inside spindle one
full turn to allow the spindle to
turn freely.
b. Loosen the trim and realign it so
that the deadbolt does not bind.
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