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Operating and fault displays
MCM10
69
3 Operation: switching
contact not activated;
not a fault.
Fault: no boiler
operational.
Remove faults at the
boiler.
Fault: switching
contact activated, but
no power supply.
Check power supply.
Replace
MCM10 module.
Fault: flow
temperature sensor
faulty.
Check temperature
sensor on the MCM10
master and
connecting lead.
Replace
MCM10 module.
Fault: system
pressure too low.
Top up the system
with water.
Fault: no
communication
between
MCM10 module and
all connected boilers
for at least 1 minute.
Check corresponding
cables/leads.
Replace
MCM10 module.
4 Operation: no
communication
between 2 MCM10
modules or the
heating controller
(2-wire BUS).
Standard operating
mode with only one
MCM10 module or
with the MCM10
master without 2-wire
BUS controller.
Operation:
communication
between this MCM10
module and the
previous module or
the heating controller
(2-wire BUS).
Configuration:
communication
between 2 MCM10
modules or the
heating controller
(2-wire BUS).
Wait until the
configuration has
completed. The LED
will then be illuminated
steadily.
Fault: no
communication
between 2 MCM10
modules or the
heating controller
(2-wire BUS).
Check the
corresponding
connecting lead/
cable.
Replace MCM10
module or heating
controller.
Fault: no
communication
between 2 MCM10
modules or the
heating controller
(2-wire BUS),
although this
component is still
present.
Check the
corresponding
connecting lead/
cable.
Replace MCM10
module or heating
controller.
Fault: no
communication
between 2 MCM10
modules or the
heating controller
(2-wire BUS) because
this component has
been deliberately
removed.
Carry out
configuration reset
(Æ chapter 4.3).
LED Off On Flashing
No. Diagnosis Remedy Diagnosis Remedy Diagnosis Remedy
Tab. 10 Operating and fault displays
69


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