Displayed
fault code
Const.
Weat-
her-
comp.
System
character-
istics
Cause
Remedy
FF
X
X
Burner
blocked
Internal fault
Remove EMC
interference.
If the equip-
ment will not
restart, check
the boiler
coding card
and replace,
or replace the
control unit.
Repairs
Checking the outside temperature sensor (weather-compen-
sated control units)
1.
Pull plug X3 from the control unit.
Checking and acknowledging faults
(cont.)
85
Troubleshooting
56
92
550
GB
Summary of Contents for VITODENS 300 WB3A
Page 10: ...Opening the control unit housing 10 5862 570 GB...
Page 14: ...Closing control unit housing and inserting user interface 14 5862 570 GB...
Page 129: ...Parts lists cont 113 Parts lists 5692 550 GB...
Page 130: ...Parts lists cont 114 Parts lists 5692 550 GB...
Page 131: ...Parts lists cont 115 Parts lists 5692 550 GB...
Page 132: ...Parts lists cont 116 Parts lists 5692 550 GB...
Page 133: ...Parts lists cont 117 Parts lists 5692 550 GB...
Page 145: ...129 5692 550 GB...
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