49
Cause Remedy
■
Control unit incorrectly adjusted.
■
The remote control (if installed) is set incorrectly.
Separate operating instructions
Check the settings and correct if required:
■
Operating program (see page 15)
■
Room temperature (see page 29)
■
Time (see page 42)
■
Time program, central heating (see page 30)
■
Heating curve (see page 30)
"Fault" is displayed. The red fault indicator flashes. Check what type of fault it is. Acknowledge the fault
(see page 45). If necessary, notify your heating contrac-
tor.
The mixer motor is faulty. Adjust the mixer manually.
In conjunction with a mechanical ventilation unit:
The bypass does not open.
Check the following settings and correct if required:
■
Set room temperature for ventilation "Set room tem-
perature" (see page 39)
■
Minimum supply air temperature for ventilation "Min.
supply air temp. Bypass" (see page 39)
If necessary, notify your heating contractor.
There is no hot water
Cause Remedy
The heating system is off.
■
Switch ON the ON/OFF switch (see page 27).
■
Switch ON the mains isolator if installed (outside the
boiler room).
■
Set the MCB in the power distribution board (main do-
mestic MCB).
■
Control unit incorrectly adjusted.
■
The remote control (if installed) is set incorrectly.
Separate operating instructions
DHW heating must be enabled.
Check the settings and correct if required:
■
Operating program (see page 15)
■
Room temperature (see page 29)
■
Time (see page 42)
■
Time program, central heating (see page 30)
■
Heating curve (see page 30)
No fuel. For operation with LPG:
Check the fuel reserves and re-order if required.
For operation with natural gas:
Open the gas shut-off valve. If necessary, check with
your gas supply utility.
"Fault" is displayed. The red fault indicator flashes. Check what type of fault it is. Acknowledge the fault
(see page 45). If necessary, notify your heating contrac-
tor.
What to do if...
Rooms are too hot
5811580
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