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Les langues disponibles
Maintenance
ERROR DESCRIPTION
4
20
Bus power supply overload
7
01
Faulty Z1 delivery sensor
7
02
Faulty Z2 delivery probe
7
11
Faulty Z1 return probe
7
12
Faulty Z2 return probe
7
22
Zone 2 overheating
7
50
MZ hydraulic diagram not
defined
7
53
38 - EN
SOLUTION
A BUS power supply overload error may occur
due to the connection of three or more devices
within the installed system. Devices which may
overload the BUS network include:
- Multi-zone module
- Hybrid System or Heat Pump Energy Man-
ager.
- Solar pump assembly
- Instant domestic hot water production module
To avoid overloading the BUS power supply,
set microswitch 1 on one of the PCBs inside the
equipment connected to the system (except the
boiler and energy manager) to OFF.
microswitch
Check the connection of the relative probe.
Check the continuity of the probe.
Replace the probe if necessary.
Check whether the shunt is present and wheth-
er it is connected to terminal board 'ST2' of the
box, or check the maximum heating tempera-
ture adjustment for Zone 2 (parameter 525).
Check the connection of the safety thermostat
on terminal board 'ST2' of the box.
Set parameter 7.2.0. Hydraulic circuit diagram
ON
OFF
1
2
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