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FAULT FINDING
Problem Cause Remedy
Switch off appliance at
master switch, wait a few
seconds then switch on
again
Check setting
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
Temperature rises
instead of falling
No display or display unit
does not respond
Hot water temperature
too low
Radiators are too hot
Clock is incorrectly set
Momentary power failure
Hot water temperature
dial set too low
Increase thermostatic
radiator valve setting(s)
Increase CH flow
temperature control
setting
Bleed radiators and
recharge heating system
Turn down thermostatic
radiator valves / room stat
Check setting
FAULT FINDING
WORCESTER BOSCH GREENSTAR HIGHFLOW 440
6 720 611 731a (08.04)
15
MAINTENANCE