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2.3.2 Definition of LED indicators
The following LED indicators can light up on the Celcia MC4
control panel:
LED indicator Colour Indication and definition
2 = status LED green
- not lit, no mains voltage
- continuously lit, Celcia MC4 is working normally
- flashing slowly; boiler or communication fault
- flashing quickly; Celcia MC4 is configuring
3 = thermostat
LED
yellow
- lit continuously; Celcia MC4 is connected to Celcia 15 or 20 regulator or on/off thermostat is
closed
- not lit; no Celcia 15 or 20 regulator connected or on/off thermostat is open
- flashing slowly; Celcia MC4 has no connection with OpenTherm thermostat
- flashing quickly; Celcia MC4 is configuring
4 - 7 = boiler
LEDs
yellow
- lit continuously; if the appropriate boiler is connected
- not lit; if the appropriate boiler is not connected
- flashing slowly; communication fault or boiler is not suited for Celcia MC4 control (only with
connected boiler)
- flashing quickly; Celcia MC4 is configuring
8 = system flow
temperature sen-
sor LED
yellow
- lit continuously; if the appropriate sensor is connected
- not lit; if the appropriate sensor has not been found
- flashing slowly; sensor measuring value beyond the limits
- flashing quickly; Celcia MC4 is configuring
9 = outside tem-
perature sensor
LED
yellow
- lit continuously; if the appropriate sensor is connected
- not lit; if the appropriate sensor has not been found
- flashing slowly; sensor measuring value beyond the limits
- flashing quickly; Celcia MC4 is configuring
10 = pump LED yellow
- lit continuously; pump is switched on
- not lit; pump is switched off
- flashing quickly; Celcia MC4 is configuring
11 = failure relay
LED
yellow
- lit continuously; an internal failure has occurred, boiler, communication or wiring fault
- not lit; everything working properly
- flashing quickly; Celcia MC4 is configuring
table 02 Definition of LED indicators
GB
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