Logamatic EMS RC35 user interface - Subject to technical modifications. 53
Troubleshooting
10
A3x 807 HZx supply
sensor
defective.
Break or short circuit in
the sensor lead.
Heating zone pump
continues to be activated
in accordance with the
default value. The valve is
isolated electrically and
remains in the last
position set by the
controller (it can be
adjusted by hand).
Sensor incorrectly
connected or
installed.
Break or short circuit
in the sensor lead.
Sensor is faulty.
B Check the sensor
connection and the
sensor lead.
B Check that the
sensor is correctly
mounted.
B Compare resistance
values with the
characteristic
sensor curve.
A3x 816 No
communi-
cation with
HZx mixer
module.
Heating zone x cannot be
operated correctly.
MM10 and valve (the
mixer) run automatically in
emergency mode.
Heating zone pump is
permanently activated.
Monitoring data in RC35
is invalid.
The heating zone
addresses on the
MM10 and RC35 do
not match.
B Check the dial on
the MM10.
MM10 or bus cable is
incorrectly connected
or faulty.
MM10 not
recognized by RC35.
B Check terminals on
MM10 and check
bus cable.
B Replace MM10.
Hxx Service
message;
no system
fault.
The heating system keeps
operating as much as
possible.
Example: service
interval expired.
Maintenance is
required; see boiler
documentation.
System errors do not need resetting. Contact your local service contractor or your local
Buderus office if you cannot remedy the fault yourself. Other faults are described in the
technical documentation for the boiler.
SC FC
Fault
message
Effect on control
characteristics Possible cause Remedy
Tab. 21 Fault table
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