Fault Finding - Bosch WORCESTER GREENSTAR DANESMOOR WALL MOUNTED OIL 18/25 User Instructions & Customer Care Manual

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
No display or display
unit does not respond
Hot water
temperature too low
GREENSTAR DANESMOOR WALL MOUNTED OIL 12/18 & 18/25
8 718 681 135a (08.08)
Cause
Thermostatic radiator
valve(s) set too low
Room thermostat set
too low
Temperature control
on boiler set too low
Air trapped in heating
system
Radiators are too hot
Momentary power
failure
Hot water not in timed
period on programmer
Hot water tank
temperature set too
low
Temperature control
on boiler set too low

FAULT FINDING

Remedy
Increase thermostatic
radiator valve
setting(s)
Increase room
thermostat setting
Increase temperature
control setting
Bleed radiators and,
if fitted to a sealed
system, recharge
heating system
Turn down
thermostatic radiator
valves / room
thermostat
Reduce temperature
control on boiler
Switch off boiler at
master switch, wait a
few seconds then
switch on again
Check setting
Check setting
Check setting
FAULT FINDING
11