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Vitodens 100-W, B1HA series & B1KA Combi Installation/Service
Boiler Connection
(continued)
Start-up and Maintenance
Check Control unit fuse
1. Switch off main power supply.
2. Flip down control unit.
3. Remove cover
A
.
4. Check fuse F4 T 2.5A (slow blow).
Replacements fuses are available from Viessmann.
Check DHW outlet temperature sensor
(B1KA only)
1. Pull the leads from outlet temperature sensor
A
.
2. Check the sensor resistance and compare it with
the
curve.
3. Replace the sensor in case of severe deviation.
Note:
Water can leak when replacing the outlet
temperature sensor. Shut off the cold water
supply. Drain the DHW line and the plate type
heat exchanger (DHW side).
Resistance in K
Temperature
Troubleshooting
Check DHW tank temperature sensor
(B1HA only)
1. Remove plugs
%
from the cable harness.
2. Check the sensor resistance and compare it with
the
curve.
3. Replace the sensor in case of severe deviation.
