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WORCESTER BOSCH GREENSTAR 24i/28i Junior
8 716 115 661 (05/2009)
11
MAINTENANCE
FAULT FINDING
FAULT FINDING
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.
Problem Cause Remedy
Switch off boiler at the
mains supply, wait a few
seconds then switch on
again
Check setting
Reduce flow rate at tap
Desired room
temperature is not
reached
Thermostatic radiator
valve(s) set too low
Temperature control for
CH flow on boiler set too
low
Air trapped in heating
system
Desired room
temperature exceeded by
large amount
Heating stays on for too
long
No on/off indicator light
Hot water temperature
too low
Radiators are too hot
Clock is incorrectly set
Momentary power failure
Programmer setting
Water flow at tap too high
Increase thermostatic
radiator valve setting(s)
Increase CH flow
temperature control
setting
Bleed radiators and
recharge heating system
Turn down thermostatic
radiator valves / room
thermostat
Reduce central heating
temperature on boiler
Check setting