Fault Finding - Worcester GREENSTAR HIGHFLOW 440 User Instructions & Customer Care Manual

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
Desired room
temperature is not
reached
Desired room
temperature exceeded by
large amount
Heating stays on for too
long
No on/off indicator
Hot water temperature
too low
Hot water temperature
too high
12
FAULT FINDING
CAUSE
Thermostatic radiator
valve(s) set too low
Temperature control for CH
flow on boiler set too low
Air trapped in heating
system
Radiators are too hot
Clock is incorrectly set
Momentary power failure
Temperature set too low
Programmer setting
Water flow at tap too high
Temperature set too high
USER INSTRUCTIONS & CUSTOMER CARE GUIDE
8 716 115 220b (03.2010)
REMEDY
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
Switch off boiler at master switch,
wait a few seconds then switch
on again
Check setting
Check setting
Reduce flow rate at tap
Check setting