Viessmann Vitodens 200-W Installation And Service Instructions Manual page 116

Diagnosis and service scans
Checking outputs (relay test)
Display
16
17
18
19
20
21
22
116
Explanation
Solar circuit pump output on solar control module SM1 switched
to minimum speed
Solar circuit pump output on solar control module SM1 switched
to maximum speed
Output sS on solar control module SM1 active
Contact P - S at plug aBJ of extension EA1 closed
Output A1 at extension AM1 enabled
Output A2 at extension AM1 enabled
Output sA active (circulation pump for cylinder heating)
(cont.)