Specifications

7 181 465 346 GB (03.02)
Failure identification procedure
47
Specified CH flow temperature from TA... programmer exceeded
Check Action
B Note the setting of the temperature controls
and .
If outside-temperature controlled programmer (TA...) is connected to boiler:
• The anti-cycle time is adjusted by the programmer to the suit the system.
• The factory setting for the anti-cycle time (3 min.) and the heating mode hysteresis setting, if applica-
ble, are deactivated.
• In cyclic mode, the switching of the boiler on or off is subject to a time delay in order to prevent diver-
gence between the average CH flow temperature and the specified CH flow temperature.
As a result (depending on the heat draw), the specified CH flow temperature is briefly exceeded.
In extreme cases, it can happen that the burner does not switch off until the maximum CH flow temper-
ature is reached even though a lower CH flow temperature has been specified.
1.
B Press button .
B Select service-function 2.7.
Read off status of automatic anti-
cycle time (0 = Disabled, 1 = Ena-
bled).
B Disable automatic anti-cycle time, i.e. change
setting to 0.
2. B Select service-function 2.4.
Read off anti-cycle time setting
(0 ... 15 min).
B Set anti-cycle time as required, e.g. factory set-
ting 3 min.
To return to normal function mode:
B Press buttons and simultaneously.
B Regulate the temperature control and the
temperature control on the previously set
positions.
Hot water has unpleasant odour or is dark colour
Check Action
This is generally caused by the formation of hydrogen sulphide by sulphate-reducing bacteria. Such bacteria are
found in water which is very low in oxygen and live off the hydrogen produced by the anode.
1. B Clean the hot water cylinder.
B Replace the sacrificial anode.
B Heat cylinder to a temperature ≥60˚C
2. B Replace magnesium sacrificial anode with
impressed-current anode.
The conversion costs are payable by the operator!