14
Fault Finding
GREENSTAR HIGHFLOW CDi
ErP
– 6 720 815 063 (2015/05)
7.1 ERROR CODES
When calling Worcester, Bosch Group, you may be asked for the error code. This Table is for you to help identify
the possible cause of the fault.
▶ Do not try to rectify any of the faults listed below by yourself.
▶ Contact British Gas or a competent, qualified engineer (Gas Safe registered personnel).
Error code Description
A7 Hot water NTC sensor defective.
A8 Break in communication to weather compensating clip-in control or
Greenstar Comfort II RF
b1 Code plug not detected.
C6 Fan speed too low.
E2 CH flow NTC sensor defective.
E9 Safety temp. limiter in CH flow has tripped.
EA Flame not detected.
Check, if it safe to do so:
• if gas is on in the house
• for frozen condensate pipe
• for blocked flue outlet
F0 Internal error.
F7 Flame detected even though boiler switched off.
FA Flame detected after gas shut off.
Fd Reset button pressed by mistake.
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