Midea MLHBF211D21, User Manual, Page: 15 / 17

Maintenance
Keep the lock surface away from corrosive substances to prevent damaging the lock’ s surface protection
layer.
The handle is a key part of the door lock. Do not hang objects on the handle
.
If the door is deformed, the latch bolt cannot be fully extended. In this case, the position of the latch protector
and the latch box should be adjusted by professional technicians.
If the fingerprint detector is dirty or wet, wipe it gently with a dry soft cloth.
When the power is low, replace all batteries immediately to ensure the lock can work properly.
Store the mechanical key in a safe place.
Do not scratch the fingerprint detector or touch the number pad with a hard, or sharp object.
If the lock cannot rotate flexibly or it is displaced, ask a professional to lubricate the lock cylinder.
The lock body should be maintained once every six months to ensure it is normally operate.
If the key cannot be inserted smoothly, fill the lock cylinder groove with graphite powder, pencil powder, or
special lubricant. Do not add any other oil for lubrication to avoid grease sticking to the spring, as this may jam
the cylinder.
Appendix
Packing List
Check the following drawing to check whether the package contains all the parts.
Note
No. Name Qty
01
02
03
04
05
06
07
08
Outer unit
Inner unit
Lock body
Door buckle
1
1
1
1
1
4
4
1
No. Name Qty
11
12
13
14
15
16
17
18
2
1
1
1
4
4
2
1
Countersunk screw
(countersunk raised head
screws with cross recess)
RF Cards
User Manual
Installation Hole Diagram
Desiccant
Fixed gusset on a wooden
door: cross recessed
countersunk self-tapping screw
Fixed gusset on a iron
Countersunk sleeve
Reversing screw
Fixing the lock body on an
iron door: cross recessed
countersunk screw
Square shaft
Door buckle box
(for wooden doors only)
09 2
Keys
Maintenance
FAQs
After the Lock is installed, double check or debug it as follows:
Problem
The fingerprint, password and RF
card are successfully verified, but
the door do not unlock.
Double check by professional.
Use the correct mechanical key.
Double check by professional and replace
the damaged parts.
Use a valid fingerprint, modify the password
or use the emergency mechanical key to
unlock.
Register another fingerprint.
Moisten/dry/warm up your finger and try
again;
Input the fingerprint correctly.
Double check by professional.
Ask a professional to check the lock and
replace the damaged parts.
Use an emergency battery or emergency
mechanical key to open the door and
check the batteries.
Use the mechanical key to open the door
and ask a professional to check the lock.
Return the handle to its original position.
Enter the valid password or fingerprint
Double check by professional.
Double check by professional.
Wrong mechanical key
The cylinder is damaged.
The lock body is damaged.
The lock clutch is damaged.
Invalid fingerprint
The fingerprint has been deleted.
The finger is placed in the wrong place.
The fingerprint is damaged or the finger
is too dry, wet or cold.
You press your finger too hard and the
fingerprint loses shape or you press your
finger too lightly that the fingerprint does
not fully cover the input area.
Installation problem
Mechanical failure of the lock body, the
clutch wire is broken, or the clutch wire is
not installed properly.
The lock body will be stuck if there are
parts on the lock body stained with
foreign matter or the wiring of the outer
unit and inner unit is not properly placed.
The connecting wires are loosen.
The motor fdamaged.
The batteries are running out or in stalled
incorrectly.
The connecting wires are loosen.
The handle does not return to its
original position when the fingerprint
or password is verified.
The lock spring of the outer unit handle
bar is abnormal.
Clutch assembly failure
The lock spring is abnormal.
Cause
Solution
Emerge n cy mechani cal key
cannot be unlocked.
When verifying the fingerprint, the
voice prompt hints that it is unable
to unlock.
The main bolt cannot be fully
retracted when turning the outer
unit handle.
The password and fingerprint are
verified, but the motor does not
work and unable to unlock.
No response when touch the
number pad.
Password and fingerprint are verified
and the motor rotates normally.
Outer unit handle cannot be unlocked
but idling.
The lock is normal but cannot be used
properly.
again.
door: cross recessed
countersunk self-tapping screw
Bamboo screw
10
1