Viessmann boiler error 1d1
The viessmann boiler error code 1d1 is most probably related to the water pressure.
Viessmann Boiler Error Code 1d1:
Water pressure too high will make the pump stop, leading to an error 1d1. The solution is to adjust the water pressure or replace the pump.
The boiler reports the error code “1D1” if the water temperature is too low or if there is a leak in the heating system. A short circuit can also cause an error code.
If it happens after running for more than 15 minutes, it may be due to your home’s wrong radiator installation position and should be corrected to avoid this issue.