USER INSTRUCTIONS & CUSTOMER CARE GUIDE
MAINTENANCE
12
FAULT FINDING
8 716 115 220b (03.2010)
FAULT FINDING
PROBLEM CAUSE REMEDY
This table gives information on basic operating system problems.
In the unlikely event of a boiler fault please read the following page thoroughly before contacting
Worcester, Bosch Group.
Desired room
temperature is not
reached
Thermostatic radiator
valve(s) set too low
Increase thermostatic radiator
valve setting(s)
Temperature control for CH
flow on boiler set too low
Increase CH flow temperature
control setting
Air trapped in heating
system
Bleed radiators and recharge
heating system
Desired room
temperature exceeded by
large amount
Radiators are too hot Turn down thermostatic radiator
valves / room thermostat Reduce
central heating temperature on
boiler
Heating stays on for too
long
Clock is incorrectly set Check setting
No on/off indicator Momentary power failure
Switch off boiler at master switch,
wait a few seconds then switch
on again
Hot water temperature
too low
Temperature set too low
Programmer setting
Water flow at tap too high
Check setting
Check setting
Reduce flow rate at tap
Hot water temperature
too high
Temperature set too high
Check setting
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