Hello,
Viessmann Vitodens 111w boiler. I have been having a problem with the f2 error for a week. It appears, say, once every two days. Yesterday I noticed that the error appears only when you need to heat the domestic hot water. Everything is OK in the radiator circuit.
What I noticed was strange in the boiler - below is the step-by-step procedure:
1. I turn on the hot water in the house,
2. the boiler receives a signal that the hot water needs to be heated,
3. starts heating domestic hot water,
4. the circulation temperature increases to over 90 degrees C,
5. the burner turns off,
6. the temperature in the boiler drops
7. repeats steps 3 to 6 (several times - until the water in the tank is heated to the desired level)
These steps 3 to 6 take only 15 - 20 seconds.
When it worked properly, the boiler always heats at 100% power when the burner is turned on, and then the power drops to, say, 40%.
Now the boiler`s heating power does not drop and it still heats at 100% (as if the power had not managed to drop to the above-mentioned 40%, because sometimes it drops and it`s ok). When heating radiators, it always drops to "20 - 40%".
I checked the temperature sensor at the hot water outlet with a meter - I am sure it works properly
Viessmann Vitodens 111w boiler. I have been having a problem with the f2 error for a week. It appears, say, once every two days. Yesterday I noticed that the error appears only when you need to heat the domestic hot water. Everything is OK in the radiator circuit.
What I noticed was strange in the boiler - below is the step-by-step procedure:
1. I turn on the hot water in the house,
2. the boiler receives a signal that the hot water needs to be heated,
3. starts heating domestic hot water,
4. the circulation temperature increases to over 90 degrees C,
5. the burner turns off,
6. the temperature in the boiler drops
7. repeats steps 3 to 6 (several times - until the water in the tank is heated to the desired level)
These steps 3 to 6 take only 15 - 20 seconds.
When it worked properly, the boiler always heats at 100% power when the burner is turned on, and then the power drops to, say, 40%.
Now the boiler`s heating power does not drop and it still heats at 100% (as if the power had not managed to drop to the above-mentioned 40%, because sometimes it drops and it`s ok). When heating radiators, it always drops to "20 - 40%".
I checked the temperature sensor at the hot water outlet with a meter - I am sure it works properly
