Vaillant F75 Fault Code – Causes & Fixes in Glasgow & Surrounding Areas

Vaillant F75 Fault Code – Causes & Fixes in Glasgow & Surrounding Areas

If your Vaillant boiler is displaying the F75 fault code, it means the system isn’t detecting water pressure changes when the pump starts. This is a common issue in areas like Bearsden, Milngavie, Clydebank, Knightswood, Anniesland, Scotstoun, and Yoker, but it can be fixed quickly with the right approach.

---

What Causes the F75 Error?

1. Faulty Pump – If the pump is weak or failing, it won’t create enough pressure for the boiler to register.

2. Blocked or Dirty Pressure Sensor – Over time, sludge and debris in Glasgow’s older heating systems can clog the pressure sensor, stopping it from working properly.

3. Low System Pressure – If there’s not enough water in the system, the pressure won’t rise when the pump starts.

4. Airlocks or Blockages – Trapped air or sludge in the pipes (common in older homes around Partick, Scotstoun, and Drumchapel) can prevent water from circulating correctly.

---

How to Fix the F75 Fault Code

1. Check & Repressurize the System

Look at the boiler pressure gauge. If it’s below 1.0 bar, it needs topping up.

Use the filling loop to add water until the pressure reaches 1.2 - 1.5 bar.

Reset the boiler and see if the error clears.

2. Clean or Replace the Pressure Sensor

A Gas Safe engineer can remove and clean the pressure sensor or replace it if necessary.

3. Check the Pump

If the pump is faulty, a new one may be needed (commonly a Grundfos or Wilo replacement).

4. Power Flush the System

If sludge is causing blockages (especially in areas with older heating systems like Yoker and Clydebank), a power flush can clear the system and prevent future issues.

---

Need an F75 Fault Fixed in Glasgow?

If repressurizing doesn’t work or the problem keeps coming back, it’s best to call a Gas Safe registered engineer. We provide expert boiler repairs across Glasgow, Bearsden, Milngavie, Clydebank, Anniesland, Knightswood, Scotstoun, and Yoker.

📞 Call us now on 07968 047 977 for fast, local boiler repairs!