Fault Finding - Worcester GREENSTAR HIGHFLOW 440CDI ERP User Instructions

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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
EA fault code flashing on
display
Desired room temperature is
not reached
Desired room temperature too
high
Heating stays on for too long
ON/OFF Indicator is not
illuminated
Hot water temperature too low Temperature set too low on boiler
Hot water temperature too high Temperature set too high on boiler
Table 1 Fault finding
GREENSTAR HIGHFLOW CDi
Cause
No gas supply/low gas supply pressure
Condensate outlet blocked
Flue blocked
Thermostatic radiator valve(s) set too
low
Temperature control for central heating
flow on boiler set too low
Air trapped in heating system
Low system water pressure
Low temperature setting on the boiler
controls
Radiators are too hot
Clock is incorrectly set
Momentary power failure
controls
Water flow at tap too high
Air trapped in heating system
Low system water pressure
controls
Water flow at tap too low
ErP
– 6 720 815 063 (2015/05)
Remedy
▶ Contact your gas supplier.
▶ If it is safe to do so, check your condensate pipe
outlet for blockages, such as ice or foreign
objects.
▶ If it is safe to do so, check your flue outlet for
damage or blockages.
▶ Increase thermostatic radiator valve setting(s)
▶ Increase central heating flow temperature
control setting
▶ Bleed radiators and recharge heating system
▶ Re-pressurise the system, refer to pages 10
▶ Increase settings on boiler controls
▶ Turn down thermostatic radiator valves/room
thermostat
▶ Reduce central heating temperature by turning
down the Central Heating control on boiler
▶ Check setting and adjust
▶ Disconnect boiler supply, wait a few seconds
then reconnect.
▶ Check setting and adjust
▶ Reduce flow rate at tap
▶ Bleed radiators and recharge heating system
▶ Re-pressurise the system, refer to pages 10
▶ Check setting and adjust
▶ Increase flow rate at tap
Fault Finding
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