Check the boiler temperature sensor, cylinder temperature
sensor or the flow temperature sensor for low loss header
1.
Boiler temperature sensor: Pull the
leads from boiler temperature
sensor
A
and measure the resis-
tance.
Cylinder temperature sensor: Pull
the plug
%
from the cable harness
on the control unit and measure the
resistance.
Flow temperature sensor: Pull
plug X3 from the control unit and
measure the resistance across
terminals X3.4 and X3.5.
Repairs
(cont.)
87
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...
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