Viessmann VITODENS 200-W Service Instructions Manual page 94

Diagnosis and service scans
Checking outputs (relay test)
Display Explanation
16 Solar circuit pump output at solar control module SM1 switched
to minimum speed
17 Solar circuit pump output at solar control module SM1 switched
to maximum speed
18 Output sS at solar control module SM1 enabled
19 Contacts P - S at plug aBJ for extension EA1 closed
20 Output A1 at extension AM1 enabled
21 Output A2 at extension AM1 enabled
94
(cont.)