106
Checking the plate heat exchanger
1.
2.
3.
Fig. 60
1.
Shut off and drain the boiler on the heating water
and DHW sides.
2.
Release side fasteners and pivot control unit for-
ward.
3.
Remove the trap (see page 43).
4.
Undo two fixing screws; pull the plate heat
exchanger towards the back, turn and remove
towards the front.
5.
Check the connections on the heating water and
DHW side for contamination and scaling; if
required, replace the plate heat exchanger.
6.
Install in reverse order using new gaskets.
Checking the flue gas temperature sensor
The flue gas temperature sensor locks out the boiler if
the permissible flue gas temperature is exceeded.
After the flue system has cooled down, press reset
button
R
to cancel the lock.
Troubleshooting
Maintenance
(cont.)
5789 302 GB
Diagnosis
Summary of Contents for B2TB
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