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5
Operating and fault displays
MCM10
68
5 Operating and fault displays
Operating state and faults can be indicated in 4 different
ways:
Boiler displays
Remote fault indicator
Via the LEDs on the MCM10 module
Via the RC35 programming unit
5.1 Boiler displays
For further details regarding the boiler operating and fault
displays, see the boiler documentation.
5.2 Remote fault indicator
A fault indicator, for example, can be connected to the
zero volt fault contact (Æ chapter 3.2.3, page 66).
The remote fault indicator is also issued via an LED at the
MCM10 (Æ tab. 10).
5.3 LEDs on MCM10 module
Generally, 3 different states of the overall system can be
identified:
Configuration (during commissioning and after a reset)
Standard operation
•Fault.
Subject to the state of the overall system, the LEDs on the
MCM10 module (Æ fig. 13) provide indications about the
operating and fault state of individual components, and
thereby enable specific troubleshooting (Æ tab. 10,
page 68).
Fig. 13 Operating and fault indications via the LEDs
1 Green Power ON
2 Green Heating circuit pump (secondary circuit)
3 Red Switching contact for remote fault indicator
230 V AC
4 Green Communication between MCM10s
5 Green Boiler 1
6 Green Boiler 2
7 Green Boiler 3
8 Green Boiler 4
6 720 616 691-03.1T
D
1
2
3
4
5 6 7 8
LED Off On Flashing
No. Diagnosis Remedy Diagnosis Remedy Diagnosis Remedy
1Fault: no power
supply.
Check the power
supply.
Replace
MCM10 module.
Operation: standard
operation.
2 Operation: pump
OFF.
Operation: pump
ON.
Fault: pump will not
start although the LED
is ON, as the fuse for
pump output has
blown.
Replace fuse
(Æ chapter 5.5,
page 71).
Tab. 10 Operating and fault displays
68


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