Fault Finding - Worcester GREENSTAR CDi CLASSIC User Instructions

4.2

FAULT FINDING

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 too long
Hot water temperature
is too low
Hot water temperature
is too high
ON/OFF indicator is not
illuminated
Table 4 Fault finding
GREENSTAR CDi CLASSIC COMBI – 6 720 812 179 (2014/07)
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
Temperature set too low on boiler controls
Water flow at tap too high
Low system water pressure
Temperature set too high
Momentary power failure
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 refill heating system
▶ Re-pressurize the system, refer to page 13
▶ 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
▶ Check settings and adjust
▶ Reduce flow rate at tap
▶ Re-pressurize the system, refer to page 13
▶ Check settings and adjust
▶ Disconnect boiler supply, wait a few seconds then
reconnect.
Maintenance
15