Instruction manual

FAULT FINDING
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR CAMRAY EXTERNAL &
EXTERNAL SYSTEM 12/18-18/25-25/32
8 716 115 667a (05.2009)
54
FAULT FINDING
& DIAGRAMS
Start
Boiler not operating normally.
Find symptom in list below.
Boiling/
boiler
overheat
thermostat
tripping out.
Is the system water
circulating normally?
Yes
No
Is there an automatic bypass fitted,
(3m min. circuit length), if TRVs are
used on all radiators?
Yes Yes
Is the flow temperature
above 85°C?
No No
Check and rectify the
system/circulating pump.
Fit an automatic bypass valve to give
at least a 3 metre circuit when
activated.
Push themostat fully
down the thermostat
pocket.
Short
cycling
Is the boiler/burner
output matched to the
heating load?
Yes
No
Is the short cycling
caused by the external
controls?
Yes
Replace the control
thermostat.
No
Reduce the boiler/burner
output following the
instruction manual settings.
Check and correct all
external controls.
Flue
overheat
thermostat
tripping out
No
Is the boiler filled with
water?
Yes
Are all the baffles and restictor
plate/s fitted? (See installation
section for details).
Yes
No
Check boiler & flue for damage,
replace any damaged
components before filling boiler.
Refit baffles and restrictor
plate/s as appropriate for
output.
Replace the flue
overheat thermostat
UNDER NO
CIRCUMSTANCES MUST
AN APPLIANCE BE LEFT
OPERATING WITH ANY
CONTROL LINKED OUT OR
OVER RIDDEN.
Is the control thermostat
bulb pushed firmly down
the thermostat pocket?
No
Has the burner been
serviced?
Yes
Service the burner and
the boiler.
Yes
Replace the control
thermostat.
No
Replace boiler overheat
thermostat.
BOILER NOT OPERATING
NORMALLY
These fault finding charts are provided to assist competent and suitably qualified engineers to locate and rectify faults. Whilst every effort has been taken to ensure the information given is correct and complete we cannot guarantee that every eventuality has been covered. Worcester, Bosch Group cannot be held responsible for costs incurred by persons not deemed to be competent.