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Faults on the display
All LED displays are off, no text in the display
Check power supply and fuse (underneath large cover).
LED "9" illuminates, no text in the display and/or keys do not function
Switch on power supply again and then check control unit settings.
Keys do not function or not always
Check location and seating of large cover.
LED "9" flashes
The control unit has registered a fault. Scan the cause of the fault in the "Faults" menu.
Faults displayed in the "Faults" menu
Flowtemp
System too slow
Outside temp
Frost prot. flow
Frost protection
room
Boiler 1
Fault code:
Comm. boiler 1
12
Operating Instructions and
User's Information Manual
Cascade Control.
Cause:
Supply temperature sensor not/incorrectly connected or faulty.
Functions based on the supply temperature are failing.
Result:
Remedy: Check connections and sensor using the resistance table (see page 13).
Cause:
The supply temperature does not reach the nominal value less the set
temperature difference within the set period.
Result:
The control unit stays in normal mode.
Remedy: Check system components. If necessary, match the set time and/or
temperature difference. Reset the fault by pressing
Outdoor temperature sensor not/incorrectly connected or faulty.
Cause:
Result:
The control unit changes over to average outdoor temperature.
Some functions based on the outdoor temperature are failing.
Remedy: Check connections and sensor using the resistance table (see page 13).
Cause:
The supply temperature is too low to ensure freeze-up protection.
Result:
The control unit creates a heat demand. The set supply temperature is
raised at least to the nominal value for freeze-up protection.
Remedy: Check system components.
Cause:
The room temperature is too low to ensure freeze-up protection.
Result:
The control unit creates a heat demand.
Remedy: Check system components.
Cause:
At least one boiler is in a fault state (multi-boiler control unit).
Result:
Output possibly too low.
Remedy: Check boiler and boiler fault message.
Cause:
Communication error
Remedy: Check KM-BUS connection.
twice.
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