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FM443 function module - Subject to technical modifications.
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Troubleshooting 4
Fault display
Open the flap of the MEC2 programming unit if a fault appears on
the display on your MEC2 programming unit.
If there are several faults, turn the rotary selector until the faults
affecting the solar circuit or one of the two solar consumers are
indicated.
The following fault messages can be displayed:
Collector sensor
Buffer sensor bypass
Return sensor bypass
Flow sensor hear yield
Return sensor hear yield
Cylinder 1, bottom
Cylinder 2, bottom
Flow metering
Hysteresis setting
USER INFORMATION
Notify your heating contractor if faults occur on the FM443 function
module and are displayed on your MEC2 programming unit.
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