5
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
