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MAINTENANCE
WORCESTER BOSCH GREENSTAR 30CDi System
6 720 612 454a (05/10)
20 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 tho-
roughly before contacting Worcester
Bosch.
Problem Cause Remedy
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 tempera-
ture control setting
Air trapped in heating
system
Bleed radiators and rechar-
ge heating system
Desired room temperature
exceeded by large amount
Radiators are too hot Turn down thermostatic
radiator valves / room ther-
mostat
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 appliance at
master switch, wait a few
seconds then switch on
again
Hot water temperature too
low
Temperature set too low
Programmer setting
Check setting
Check setting
Hot water temperature too
high
Temperature set too high Check setting
20


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