92 | Faults
Copyright (optional information)6 720 643 068 (2011/06)
E2
Supply temperature sensor defective.
B
Check temperature sensor and leads for interruptions or
shorts, and replace if defective.
E3
Additional supply temperature sensor
defective.
B
Check temperature sensor and leads for interruptions or
shorts, and replace if defective.
E9
Heat exchanger safety high limit or flue gas
temperature limiter has tripped.
B
Check flue gas safety high limit and leads for interruptions or
shorts, and replace if defective.
B
Check heat exchanger safety high limit and leads for interrup-
tions or shorts, and replace if defective.
B
Check the operating pressure.
B
Check temperature limit; replace if defective.
B
Check pump capacitor; replace pump if defective.
B
Check PCB fuse, replace if blown (6.3 A fuse according to IEC
default).
B
Purge the appliance
B
Check heat exchanger on the DHW side; replace if clogged.
EA
No flame detected.
GFA: Safety time expired.
B
Check that ground lead is properly connected, replace if
defective.
B
Check that gas cock is open.
B
Check inlet gas pressure; correct if needed.
B
Check power supply.
B
Check electrodes for visual damage; replace if defective.
B
Check flue gas system; clean or repair if defective.
B
Check gas/air ratio; correct if out of range.
B
Check gas valve; replace if defective.
B
In room air operation, check air supply or ventilation aper-
tures.
B
Clean the condensate trap.
B
Remove diaphragm at fan inlet connection and check for
contamination or cracks.
B
Check heat exchanger for soiling (
Æ
Chapter 14.1.6,
page 84).
B
Check gas cock; replace if defective.
B
Insert code plug correctly; replace if defective.
F0
Internal fault
B
Press reset for 3 seconds and release. When the button is
released, the appliance will restart.
B
Check electrical plug-in contacts and ignition leads; replace
PCB if defective.
B
Check gas/air ratio; correct if out of specification.
F1
Internal data error.
B
Reset boiler to the factory default setting (
Æ
service function
8.E).
Display Description Elimination
Tab. 37 Faults shown on the display
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