13
Fault Finding
Greenstar Ri
ErP
- 6 720 813 340 (2014/09)
7
Fault Finding
In the event that the boiler stops functioning or does not perform as expected, you can carry out a few simple checks. These checks
are some of the most common causes of apparent faults and are listed in the table below. Should the problem persist or other alert
codes are displayed, then it will be necessary to contact Worcester, Bosch Group.
Problem
Cause
Remedy
Operation/fault light
(blue) flashing
No gas supply/low gas supply pressure
▶ Contact your gas supplier.
Condensate outlet blocked
▶ If it is safe to do so, check your condensate pipe
outlet for blockages, such as ice or foreign
objects.
Flue blocked
▶ If it is safe to do so, check your flue outlet for
damage or blockages.
Desired room
temperature is not
reached
Thermostatic radiator valve(s) set too low
▶ Increase thermostatic radiator valve setting(s).
Temperature control for central heating flow on
appliance set too low
▶ Increase central heating flow temperature
control setting
Low temperature setting on the room thermostat
▶ Increase settings on room thermostat
Radiators are too
hot
Temperature control for central heating flow on
appliance set too low
▶ Reduce central heating temperature by turning
down the Central Heating control on appliance.
Note: This could prevent your property reaching
the desired temperature during cold weather
periods.
Desired room
temperature is too
high
Thermostatic radiator valve(s) are set too high
▶ Turn down thermostatic radiator valves/room
thermostat
Room thermostat is set too high
▶ Turn down room thermostat.
Heating stays on for
too long
Clock is incorrectly set
▶ Check setting and adjust
No blue Operation/
Fault Indicator
Momentary power failure
▶ Disconnect boiler supply, wait a few seconds
then reconnect.
Hot water
temperature too low
Temperature set too low on cylinder thermostat
control.
▶ Check setting and adjust
Hot water
temperature too
high
Temperature set too high on cylinder thermostat
control.
▶ Check setting and adjust
Table 3
Fault finding
