Checking The Ionisation Current - Viessmann MatriX Service Instructions Manual

Initial start−up, inspection and maintenance
Further details regarding the individual steps

Checking the ionisation current

1. Switch OFF the mains isolator.
2. Pull the ionisation cable plug C
off.
3. Switch ON the mains isolator.
There must be a fault shutdown
after a burner start has been
attempted. The display B flashes
fault code "F 25".
4. Switch OFF the mains isolator.
Note
Test cable no. 1 is required when
checking with the Testomatik−Gas.
You can also carry out this check
with a multimeter.
5. Connect the ionisation cable
plug C with the adaptor D.
16
A
D C
(cont.)
6. Plug the socket A of the test
cable onto the ionisation
electrode.
7. Switch the mains isolator ON and
check the ionisation current.
Note
The ionisation current must be at
least 10 mA, approx. 2 to 3 s after
the opening of the gas valve and
during operation.
8. Record the test value in the
service report (on page 49).
9. Switch the mains isolator OFF ,
remove the test equipment and
reconnect the plug connector of
the ionisation cable.
10. Switch ON the mains isolator.
B