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FAULT FINDING
6 720 643 356a (2010/10)
7FAULT FINDING
If a boiler fault occurs, please read the following page thoroughly before contacting Worcester, Bosch
Group.
Problem Cause Remedy
Desired room temperature is
not reached
Thermostatic radiator valve(s)
set too low
BIncrease thermostatic
radiator valve setting(s)
Temperature control for
central heating flow on boiler
set too low
BIncrease central heating
flow temperature control
setting
Air trapped in heating system BBleed radiators and
recharge heating system
Desired room temperature
exceeded by large amount
Radiators are too hot BTurn down thermostatic
radiator valves/room
thermostat
BReduce central heating
temperature by turning
down the Central Heating
control on boiler
Heating stays on for too long Clock is incorrectly set BCheck setting and adjust
No ON/OFF mains indicator Momentary power failure BSwitch off boiler at master
switch, wait a few seconds
then switch on again
Hot water temperature too
low
Temperature set too low BCheck setting and adjust
Water flow at tap too high BReduce flow rate at tap
Hot water temperature too
high
Temperature set too high BCheck setting and adjust
Water flow at tap too low BIncrease flow rate at tap
Tab. 2
16


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