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44
Rectifying faults
Error Fd
4. Air in the heating system. B Power OFF the appliance.
B Check appliance and system for water leaks and
repair as necessary.
B Top up system.
B Turn ON the appliance.
B Activate menu option Show service parame-
ters.
B Select 7.3 Air purge mode select setting on,
autom. deactivat. and confirm.
B Vent appliance.
B Vent radiators.
Set room temperature not reached (integrated text display)
Check Action
Set room temperature exceeded by large amount (TR 2)
Check Action
1. Do radiators get too hot? yes: B Decrease setting of “Heating” control.
↓2.
no: ↓2.
2. Bad choice of location for program-
mer, e.g. outside wall, near window,
in draught, on hollow wall, etc.
yes: B Select better installation location.
oder
B Fit external room thermostat.
↓3.
no: ↓3.
3. B Turn down thermostatic valve(s).
Heating up takes too long (integrated text display)
Check Action
1. Is fast heat-up switched off? yes: B Switch on fast heat-up.
↓2.
no: ↓2.
2. Duration or output increase for fast
heat-up set too low
B Increase setting.
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