Faults; General; Failure Signals Via The Led Indicators - REMEHA Celcia MC4 Manuel D'installation Et D'utilisation

3 FAULTS

LED indicator flashing
slowly
status LED
thermostat LED
boiler LEDs
system flow tempera-
ture sensor LED
outside temperature
sensor LED
Indication and definition
Celcia MC4 internal failure, sensor, boiler or communi-
cation fault.
Celcia MC4 is no longer connected to the OpenTherm
thermostat.
Celcia MC4 is no longer connected to the boiler, or the
boiler is in failure mode.
Sensor measuring value no longer within the limits.
Sensor measuring value no longer within the limits.
Remeha Celcia MC4

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:
Check / solution
First check the other LEDs under the large
cover and resolve the failure.
Check the wiring to and from the thermostat,
or has the thermostat been removed?
Is the boiler in failure mode or switched off?
Check the OpenTherm connection.
Check the wiring.
Measure the sensor resistance value, see
table 04.
Check the wiring.
Measure the sensor resistance value, see
table 04.
table 03 LED failure indications
Temperature
[°C] System flow temperature sensor or
-10
- 5
0
5
10
20
25
40
60
80
100
table 04 Sensor resistance values
28
Resistance
Outside temperature sensor
[Ohm]
27.649
21.034
16.325
13.023
9.952
6.247
5.000
2.662
1.244
628
339