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5
Operating and fault displays
MCM10 70
5.4 Operating and fault indications via the RC35
The operating and fault indications relating to all boilers
and the MCM10 module can be checked on the controller
with EMS BUS control. For an explanation of the displays
on the MCM10 module, see tab. 11. The meaning of all
other displays is given in the documentation of the
controller and boilers.
5, 6,
7, 8
Operation: no heat
demand to the boiler;
boiler operational.
– Operation: heat
demand to the boiler;
boiler in operation.
– Configuration:
communication
between this boiler
and MCM10 module.
Wait until the
configuration has
completed.
Operation: no boiler
connected.
– Fault: boiler fault.
1)
Remove fault on the
boiler.
Configuration/
Fault: no
communication
between
MCM10 module and
this boiler, although it
is installed.
Check the
corresponding
connecting lead/
cable.
Remove boiler fault.
Replace
MCM10 module.
Fault: no
communication
between
MCM10 module and
boiler because it has
been deliberately
removed.
Carry out
configuration reset
(
Æ
chapter 4.3).
Fault: communication
error between
MCM10 module and
boiler.
1)
Check the
corresponding
connecting lead/
cable.
Replace
MCM10 module.
1) Another boiler will be enabled automatically in case of heat demand
LED Off On Flashing
No. Diagnosis Remedy Diagnosis Remedy Diagnosis Remedy
Tab. 10 Operating and fault displays
Display Description Remedy
5H Break in BUS communication. • Display in case of less than 4 installed boilers.
• Check the cable between the boiler and the MCM10 module for a possible break.
• Check the cable for firm seating and contact.
• Check whether this fault originates in a boiler (
Æ
boiler installation instructions).
• Replace MCM10 module.
4U
4Y
Short circuit (4U) or contact break
(4Y).
• Check flow temperature sensor and its lead.
• Replace MCM10 module.
EF Internal electronics fault. • If a fault is indicated by one of the boilers: replace burner control unit of the corresponding
boiler.
• If the fault is not indicated by one of the boilers: replace MCM10 module.
8Y The external switching contact has
opened.
• Check the cable of the external switching contact for a possible break.
• Check whether the connecting plug is present.
• Replace MCM10 module.
AE Jumper configuration fault. • Check whether the jumper has been correctly set.
AU The calculated boiler water
temperature is not reached in time.
• Check whether a sufficient number of boilers functions normally.
AY A fault has occurred on one or
several boilers.
• Remedy the fault on the boiler concerned.
Tab. 11 Operating and fault indications via the RC35