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Logamatic EMS RC25 programming unit - Subject to technical modifications
37
Troubleshooting
8
A01 810
1)
DHW stays
cold
The system continuously
tries to heat the DHW
cylinder to the set DHW
temperature.
DHW priority is switched
off once the fault
message has been
displayed.
Constant drawing
or system leak.
B Stop any leaks.
Temperature
sensor is
incorrectly
connected or
fitted.
Breakage or short
circuit in the
sensor lead.
Temperature
sensor faulty.
B Check sensor
connection and
sensor lead.
B Check sensor
mounting.
B Compare
resistance values
with the sensor
curve.
Cylinder primary
pump incorrectly
connected or
faulty.
B Check that the
cylinder primary
pump is working,
e.g. by carrying
out a function
test.
A01 816 No
communication
with UBA1/
UBA3/MC10
The boiler no longer
receives heat demand
signals; the heating
system may no longer
generate heat.
EMS BUS system
is overloaded.
B Reset by
switching the
heating system
OFF and ON.
B If necessary
inform your local
service engineer.
UBA1/UBA3/
MC10 faulty.
A02 816
1)
No
communication
with boiler
programming
unit.
Settings made at the
boiler programming unit
are no longer adopted by
RCxx devices.
Contact problem
at the boiler
programming unit
or boiler
programming unit
faulty.
B Check the boiler
programming unit
connection.
B If required,
replace the boiler
programming
unit.
A11 802
1)
Time is not yet
set.
Restricted functionality
for:
All switching
programs
Fault messages
Time details are
missing, e.g. due
to lengthy power
failure.
B Enter the current
time.
SC FC Fault
Effect on control
characteristics
Possible cause Remedy
Tab. 3 Fault table
37


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