63
Fig. 44
A
HBMU heat management unit
B
Programming unit with TCU 100 communication
module
Fault messages
Note
For diagnostics and troubleshooting, see chapter
"Repairs".
Fault messages dependent on appliance equipment
level
7
System characteristics
No DHW heating
Cause
Lead break, cylinder temperature sensor
Measures
■
Check DHW setting in the commissioning assistant
and correct if necessary.
■
Check the cylinder temperature sensor (terminal
S.T.S).
■
Measure the voltage at the sensor input on the
HBMU heat management unit. Set value: 3.3 V with
sensor disconnected
Replace faulty component if necessary.
Troubleshooting
Overview of electronics modules
6221465
Diagnosis
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