# Warning message
text
Cause Remedy
71 The battery needs
to be replaced
The battery has a
service life of about 10
years, but this can be
reduced by environ‐
mental factors
Replace the battery or inform Service.
Battery BR 2032, Part no. 732829.
72 Check the time The time has changed
when replacing the bat‐
tery
Reset the time.
73 The fan has a fault The internal fan is no
longer rotating
Please check to see whether an object
has become trapped in the impeller oth‐
erwise return the controller to the manu‐
facturer for inspection.
85 A fault in the
external power
supply.
The external power
supply has been incor‐
rectly designed or is
faulty.
Return the external power supply to its
correct working order.
87 The connection to
the communication
module is faulty.
The connection ele‐
ments have been incor‐
rectly installed or are
faulty.
Check the connection, repair it or
replace faulty components.
89 System warning 1 A system error exists Return the controller to the manufacturer
for inspection.
[Diagnostics]
173
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