Vaillant Boiler F84 Fault – Error Code Guide

The Vaillant F84 error code affects the ecoTec plus models of Vaillant boiler. The F84 error code means that the boiler has detected a permanent temperature difference between the flow and return pipes. This can be caused by wrongly installed or calibrated thermistors, water damage and leaks or faulty wiring. You won’t be able to … Read more

Vaillant Boiler F83 Fault – Error Code Guide

The Vaillant F83 error code affects the ecoTec plus models of Vaillant boiler. The F83 error code means that the boiler has detected an incorrect temperature change in the flow and return pipes after the boiler is lit. This can have several causes, commonly incorrectly calibrated thermistors or faulty wiring. Low pressure can contribute, which … Read more

Vaillant Boiler F76 Fault – Error Code Guide

The Vaillant F76 error code affects the EcoTec plus models of Vaillant boiler, and is a serious error code which signifies a possible dangerous boiler breakdown. At the least, parts and wiring will need to be repaired or replaced and it is likely that you will need to buy a new heat exchanger or new … Read more

Vaillant Boiler F75 Fault – Error Code Guide

The F75 error code affects the Vaillant EcoTec models )except the ectoTec heat-only). It signifies a problem with the pressure in the boiler, and can be caused by blockages in the pump or sensor, faulty parts which need replacing, or an incorrectly pressurised expansion vessel. Faulty or blocked parts will need to be dealth with … Read more

Vaillant Boiler F73 Fault – Error Code Guide

The F73 error code relates to the water sensor and affects the aquaTEC, ecoTec Plus and ecoMAX models of Vaillant boiler. This error code signifies that the water sensor is operating incorrectly, which can signal a leak or be due to faulty parts. The F73 is considered a minor error and is easily and inexpensively … Read more

Vaillant Boiler F72 Fault – Error Code Guide

The Vaillant F72 error code affects the Ecotec Pro, Ecotec Plus and Ecotec Exclusive models of Vaillant boiler. It means that there is a fault with the flow and return thermistors. Either the parts themselves are faulty, or communication between the thermistors and PCB is inconsistent due to faulty or damaged wiring. If the thermistors … Read more

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