Specified Ch Flow Temperature From Ta... Programmer Exceeded - Worcester ZSBR 7-28 ICS1 Service Booklet

Rectifying faults

Specified CH flow temperature from TA... programmer exceeded

Check
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 applicable,
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 tempe-
rature is reached even though a lower CH flow temperature has been specified.
B Activate menu option
1.
Show service parameters.
B Select 2.7 Autom. anti-cycle
mode.
Read off status of automatic anti-
cycle time (0 = Disabled,
1 = Enabled)
B Select 2.4 Anti-cycle mode.
2.
Read off anti-cycle time setting ( 0 ...
15 min)
40
Action
B Disable automatic anti-cycle time, i.e. change
setting to 0.
B Set anti-cycle time as required, e.g. factory set-
ting 3 min.
7 181 465 347 (01.07)