2
6
Check the water flow rate (domestic hot water). Insufficient water flow
rate
→
Check the incoming water supply. Incoming water supply sufficient,
water flow rate too low
→
Clean or replace the strainer in the cold water
inlet
Annually
27
Check the impeller sensor for dirt/damage and, if required, replace it
Annually
2
8
Reassemble the product
After each time maintenance
work is carried out
29
Open the service valves, carry out the required leak-tightness test
Annually
3
0
Fill the product/heating installation to the filling pressure specified for the
system
Annually
3
1
Connect the product to the electrical installation
Annually
3
2
Run the test operation on the product/heating installation including hot
water generation (if available) and, if required, purge the product/heating
installation
Annually
3
3
Measure the CO content, CO
₂
content and the CO/CO
₂
ratio again
Annually
72
