Viessmann Vitodens 300 Service Instructions Manual page 69

Checking outputs (relay test)
Display
Solar pump ON
Constant temperature control units
1. Press K and d simultaneously
for approx. 2 seconds.
Relay test enabled.
Subject to the actual equipment level, the following relay outputs can be con-
trolled:
Display
1
2
3
4
5
6
10
11
12
13
14
(cont.)
Description
Vitosolic
2. Select the relay outputs with a
and b.
3. Press d.
Relay test enabled.
Description
Burner modulation lower output
Burner modulation upper output
Diverter valve set to heating mode
Valve in central position
Valve set to DHW mode
Internal pump/output 20 ON
Output sK internal extension
Heating circuit pump A1 external extension
Cylinder loading pump external extension
DHW circulation pump external extension
Central fault external extension
Service scans
69