Vaillant F75 Fault Code

What is the Vaillant F75 Fault?

The Vaillant F75 fault is a common error code indicating issues primarily with the water pressure sensor or the boiler pump in Vaillant boilers.

The F75 error code means the boiler’s pressure sensor is not detecting the required water pressure.

There are 4 common reasons why the F75 is displayed on your boiler.

Our heating leak detection team are F75 error code experts

Common Causes of the Vaillant F75 Fault Code

Several factors can trigger the Vaillant F75 fault code, including:

Failed Water Pressure Sensor

If the sensor is defective, it cannot detect the correct water pressure

Boiler Pump Malfunction

A non-operational pump fails to circulate water, affecting pressure.

Airlocks in the System

Air trapped in the heating system can prevent water flow and pressure buildup.

Debris or Blockages

Accumulation of sludge or debris in the system can impede water flow and pressure.

Signs & Symptoms of Vaillant F75 Fault Code

Symptoms of an F75 fault include:

  • Boiler’s inability to heat water or radiators.
  • The display screen on the boiler shows the F75 error code.
  • Unusual noises from the boiler, possibly indicating pump failure or blockages.
  • Sudden drops in pressure readings on the boiler’s pressure gauge.

Fixing The Vaillant F75 Fault

This simple 3 step DIY process may save you from needing a plumbing and heating engineer to fix your F75 fault on your boiler.

  1. Bleed Radiators: Release any trapped air in the system by bleeding your radiators.
  2. Check & top up the boiler pressure: If the boiler pressure is below 1.5 bar then top up the boiler pressure.
  3. Reset the Boiler: A simple reset after bleeding the radiators can sometimes clear the fault.

If this DIY process fails to get your boiler working again it is likely your boiler pump is broken or you have a faulty pressure sensor.

If the process got your boiler working again but the F75 error displays again shortly after then you are likely to have a leak on your heating system.

Vaillant F75 FAQ's

The cost of repairing an F75 error varies based on the specific cause and the rates of a qualified engineer.

Generally, it might involve the replacement of parts like the water pressure sensor or the boiler pump, or simply labor for system cleaning and air removal.

Preventive measures include regular boiler maintenance, annual servicing by a Gas Safe registered engineer, bleeding your radiators annually, and ensuring the system is free from blockages.

When To Call ADI Leak Detection To Help With Your F75 Error Code

If topping up the pressure in your boiler clears the F75 error code but it reappears soon after then you have a leak on your central heating system.

If there are no visible signs of a leak on your heating system pipework, radiators or boiler then its time to call a heating leak detection professional.

ADI Leak Detection are CIPHE (Chartered Institute of Plumbing and Heating Engineering), WIAPS (Water Industry Approved Plumbers’ Scheme) and Watersafe accredited so you can trust the service you will receive.

Call us today on 0800 731 3843 and see how we can help you with your F75 fault.

ADI Leak Detection Water Mains Office Team

Adrian Morgan

Adrian Morgan CIPHE RP RHP is the founder & Managing Director of ADI Pro Leak Ltd. Adrian is also the Head Plumbing, Heating & Leak Detection engineer at ADI Leak Detection.

Adrian CIPHE RP RHP is proud to be registered with the Chartered Institute of Plumbing & Heating Engineering, a Registered Plumber and a Registered Heating Professional.