Viessmann B1HF - Page 84

84
Fig. 43
■
Constant green LED:
Pump is running without external control from the
boiler controller
■
Flashing green LED:
Pump is running with external control from the boiler
controller
■
Constant red LED:
Pump failure
Note
The pump is controlled by a PWM signal. A lead break
in the data line will not generate a fault message.
The pump is operating at 100 % of its maximum out-
put.
Troubleshooting
Repairs (cont.)
6167586
Diagnosis