F2 Fuse Malfunction, Or Exhaust-Gas Sensor Tripped - Buderus 24C Servicing Manual

Troubleshooting
4
Flashing
F2 fuse malfunction, or exhaust-gas
sensor tripped
"reset"
New fault
warning message
Remove the casing (page 48)
Check miniature fuse F2 (page 53)
Miniature fuse F2 OK?
Check wiring connection of UBA
(page 53)
Wiring connection
Check exhaust-gas sensor
(page 49)
Exhaust-gas
sensor OK?
page 16
Fig. 12 Fault warning message 4C: F2 fuse malfunction, or exhaust-gas sensor tripped
Subject to modifications resulting from technical improvements!
Servicing manual for wall-mounted condensing gas boiler 600 Series 11S/19S/24S/24C • Issued 02/2006
C
No
4C?
Yes
No
Yes
No
OK?
Yes
No
Yes
18
Fuse (1.25 AT) should be
replaced
Connect lead correctly
Replace exhaust-gas sensor
(page 49)
Buderus Ltd. • http://www.buderus-domestic.co.uk
19 20
page 16
page 16
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15