Fault Finding - Bosch Worcester Greenstar 27i System Compact 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 other alert codes are
displayed, then it will be necessary to contact the Worcester, Bosch Group.
Problem
EA fault code flashing on
display
Desired room temperature is
not reached
Desired room temperature too
high
Heating stays on for too long
No blue Operation/Fault
Indicator
Hot water temperature too low Temperature set too low on boiler
Hot water temperature too high Temperature set too high on boiler
* This feature is only available if the optional integral diverter valve has been fitted.
Table 2 Fault finding
Greenstar i System Compact – 6 720 807 727 (2013/05)
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
Energy saving feature is activated
controls*
Air trapped in heating system
Low system water pressure
controls*
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 page 15
▶ 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.
▶ Ask your installer to reset the blue light
▶ Check setting and adjust
▶ Bleed radiators and recharge heating system
▶ Re-pressurise the system, refer to page 15
▶ Check setting and adjust
FAULT FINDING
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