Fault finding and diagnosis
Greenstar i System
ErP
- 6 720 806 945 (2015/07)
64
7.8
Short parts list
8
Fault finding and diagnosis
8.1
Fault finding
Should a fault develop with this appliance (or the system), the appliance
will enter a locking or blocking condition, and fault code information will
be generated as described in this section.
Only use Worcester original spare parts with this
appliance. Non Worcester original spare parts will
invalidate the guarantee (if applicable) and any
warranty.
Gasket -burner
8 716 110 534 0
Electrodes (including
gasket & shield)
8 716 116 381 0
Burner (9kW, 12kW,
15kW, 18kW NG &
LPG)
8 716 116 379 0
Burner (21kW &
24kW NG & LPG)
8 718 120 619 0
Fuse
8 716 116 900
O ring - siphon
8 716 113 851 0
Spark generator
8 716 117 077
Siphon
8 716 117 083
High limit stat
8 707 206 196 0
Gas valve
8 718 600 04A 0
Flow NTC
8 714 500 087 0
Flue overheat
thermostat
8 710 506 267 0
Pump assembly
8 716 117 400
Fan
8 716 117 417
Pressure relief valve
3 bar
8 716 106 431 0
Auto air vent
8 716 106 445 0
Control panel
8 716 117 070
Expansion vessel
8 716 117 023
Pressure gauge
8 76 116 428 0
By pass valve
8 716 106 434 0
Table 45 Parts list main appliance
Parts list when integral diveter valve is fitted
Diverter valve
assembly
8 716 117 405
Diverter valve motor
8 718 682 839 0
Cylinder temperature
sensor
8 716 116 824
Table 46 Parts list integral diverter valve kit
This fault finding information is for guidance only.
Worcester cannot be held responsible for costs incurred
by persons not deemed to be competent.
Locking error
The appliance display will flash a warning triangle and
fault code. At the same time a (static) cause code will
also be displayed. Manual intervention is required
following clearance of the fault:
▶ Press the reset button briefly once on the
appliance facia
• The last eight locking errors can be found in the
History menu (
Blocking error The appliance will stop operating with no fault data
displayed. The condition will clear automatically when
the associated fault clears e.g. waiting for an area to
cool. In some cases a blocking error has a defined
time duration prior to changing to a locking condition.
• The last eight blocking errors can be found in the
History menu (
Fault code
Alpha numeric code indicating the fault group
Cause code
Three digit number. During a blocking error (or normal
operating status) it is not displayed, but accessed in
the info menu via the spanner/return button. During a
locking error the cause code flashes on the display.
Maintenance
codes
These are displayed with the letter H followed by a
number. The code advises of a situation that will need
some attention but is not a fault that will stop the
appliance from functioning.
• The maintenance messages can be found in the
History menu (
• Two examples are listed below:
H09
H13
Communications to the pump has failed.
The feedback signal has been lost, possible causes
are electrical connections loose or disconnected,
pump has been replaced with an incorrect type.
A time has been set in the Service interval function i.e.
1 to 72 months and that time has expired. Service
reminder time in the Boiler settings menu
(section 6.5.13, page 45) allows this feature to be set
(1 to 72), a 0 will disable this function.
Table 47
Resistance values
▶ Component resistance characteristics can be found
• Flow temperature NTC sensor
• DHW NTC sensor
• Flue overheat thermostat
• Overheat thermostat
• Outdoor weather compensation sensor
• Cylinder temperature sensor
• Gas valve
