Vaillant ecotec plus 824R4 combi boiler

[Itryhonestly]

Hi All
I have the boiler listed and have noticed lately that the radiators are not as hot as usual. Today however disaster has struck and I have no hot water heating. On the boiler screen there is neither tap nor gas valve symbol and I am getting fault 75 readings. I have bled the radiators and refilled the system but this has not helped. Perhaps you can?

 

[PrenticeBoyofDerry]

The F75 can be flagging up a number of faults, these faults will include pressure loss/rises, expansion vessel charge and others faults related to heat exchanger, block filter and pump. Most of this work will require a gas safe engineer to investigate.

 

[Agile]

Apart from ensuring that the system pressure is correct all the other causes will require an engineer.

Increasing system pressure above the normal 1.5 bar to perhaps 2.0 bar will sometimes reduce the number of times an F75 fault occurs.

But the simple answer is that you need an engineer and particularly one who is familiar with F75 faults.

Tony