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Preparing the boiler for operation
Thermoregulation
100
90
80
70
GB
60
50
40
30
20
10
0
CALIBRATION VALVE (Vm)
turns closing
open
1
2
3
4
close
Troubleshooting guide
The MCD module is protected against the risk of breakdown by internal checks carried out by the PCB which, if necessary, will activate a safety
shutdown.
The table below shows the possible error codes, their descriptions and the recommended action to be taken in each case:
Error code
7 0 1
Zone 1 heating fl ow temperature sensor fault
7 0 2
Zone 2 heating fl ow temperature sensor fault
7 1 1
Zone 1 heating return temperature sensor fault
7 1 2
Zone 2 heating return temperature sensor fault
7 2 2
Zone 2 overheating
7 2 3
Zone 3 overheating
4 2 0
BUS supply overload
50
Balancing fl ow rates based on the opening of the calibration valve Zone 2
Equilibrage des débits en fonction de l'ouverture de la vanne de réglage Zone 2
100 % = fully open - 0 % = fully closed
100% = totalement ouverte 0% = totalement fermée.
Flow rate zone 1(l/h)
Débit zone 1 [l/h]
DIRECT CIRCUIT
FLOW RATE
opening (%)
(%)
100
46
80
44
60
40
40
30
20
10
0
0
Description
Flow rate of primary circuit zone 2 (l/h)
Débit primaire zone 2 [l/h]
MIXED CIRCUIT
PARAMETER 551
PRIMARY SIDE
CONDENSING
BOILERS
(%)
54
56
60
70
90
100
Recommended action
Check the connection of the sensor concerned.
Check the continuity of the sensor.
Replace the sensor if necessary.
Check the maximum heating temperature setting for Zone 2 (para-
meter 525).
Check the connection of the safety thermostat to the "ST2" termi-
nal block on the module.
Check for the shunt and its connection to the "ST3" terminal block
on the module.
A "BUS supply overload" error may appear when three or more
devices supplying power to the BUS are connected to the system.
Example: boiler + hydraulic module + solar pump unit, etc. To avoid
this risk, the microswitch (1) on the electronic PCB of one of the
connected devices (not the boiler) must be switched from ON to
OFF.
O
N
1
2
1000
900
800
700
600
500
400
300
200
100
0
PARAMETER 551
CONVENTIONAL
BOILERS
(°C)
(°C)
15
20
14
18
13
17
10
15
10
15
10
15
O
N
1
2
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