13
Fault Finding
GREENSTAR HIGHFLOW CDi
ErP
– 6 720 815 063 (2015/05)
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 and are listed in the table below. Should the problem persist or if other fault codes are
displayed, then it will be necessary to contact the Worcester, Bosch Group.
This table gives information on basic operating system problems.
Problem Cause Remedy
EA fault code flashing on
display
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 boiler set too low
▶ Increase central heating flow temperature
control setting
Air trapped in heating system
▶ Bleed radiators and recharge heating system
Low system water pressure
▶ Re-pressurise the system, refer to pages 10
Low temperature setting on the boiler
controls
▶ Increase settings on boiler controls
Desired room temperature too
high
Radiators are too hot ▶ Turn down thermostatic radiator valves/room
thermostat
▶ Reduce central heating temperature by turning
down the Central Heating control on boiler
Heating stays on for too long Clock is incorrectly set ▶ Check setting and adjust
ON/OFF Indicator is not
illuminated
Momentary power failure ▶ Disconnect boiler supply, wait a few seconds
then reconnect.
Hot water temperature too low Temperature set too low on boiler
controls
▶ Check setting and adjust
Water flow at tap too high
▶ Reduce flow rate at tap
Air trapped in heating system
▶ Bleed radiators and recharge heating system
Low system water pressure
▶ Re-pressurise the system, refer to pages 10
Hot water temperature too high Temperature set too high on boiler
controls
▶ Check setting and adjust
Water flow at tap too low
▶ Increase flow rate at tap
Table 1 Fault finding
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