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Remeha Celcia MC4
3 FAULTS
3.1 General
If any of the connected boilers goes into fault mode, or is heat-
ing tap water, the Celcia MC4 will automatically switch the fol-
lowing boiler on.
The LED indicators on the Celcia MC4 also serve as fault indi-
cator. If the regulator is controlled via the Celcia 15 or 20, the
failure signal will be displayed on the Celcia 15 or 20.
3.1.1 Failure signals via the LED indicators.
The LED indicators on the Celcia MC4 display failures as fol-
lows:
LED indicator flashing
slowly
Indication and definition
Check / solution
status LED
Celcia MC4 internal failure, sensor, boiler or communi-
cation fault.
First check the other LEDs under the large
cover and resolve the failure.
thermostat LED
Celcia MC4 is no longer connected to the OpenTherm
thermostat.
Check the wiring to and from the thermostat,
or has the thermostat been removed?
boiler LEDs
Celcia MC4 is no longer connected to the boiler, or the
boiler is in failure mode.
Is the boiler in failure mode or switched off?
Check the OpenTherm connection.
system flow tempera-
ture sensor LED
Sensor measuring value no longer within the limits.
Check the wiring.
Measure the sensor resistance value, see
table 04.
outside temperature
sensor LED
Sensor measuring value no longer within the limits.
Check the wiring.
Measure the sensor resistance value, see
table 04.
table 03 LED failure indications
Temperature
[°C]
Resistance
System flow temperature sensor or
Outside temperature sensor
[Ohm]
-10 27.649
- 5 21.034
0 16.325
5 13.023
10 9.952
20 6.247
25 5.000
40 2.662
60 1.244
80 628
100 339
table 04 Sensor resistance values
28


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