If your boiler pressure keeps dropping or your boiler is showing an error message, it’s a clear sign that something isn’t right within your heating system. This is one of the most common issues homeowners face, particularly during the colder months when boilers are working harder.
At Gas Care Plus, our qualified Gas Safe registered engineers diagnose and repair boiler pressure problems quickly and safely, ensuring your central heating system runs efficiently and reliably.
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🔍 Understanding Boiler Pressure
Boiler pressure refers to the level of water circulating in your central heating system. Most modern combi boilers operate best between 1.0 and 1.5 bar when cold. If the pressure drops below this range, your boiler may show a low-pressure error code and stop working to protect internal components.
Common error codes include:
• F22 (Vaillant) – Low water pressure
• E119 (Baxi) – Low pressure
• E10 (Ideal) – System water pressure too low
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⚠️ Main Causes of Boiler Pressure Drop
1. Leaks in the Heating System
Small leaks are the number one cause of a pressure drop. These can occur anywhere — from radiator valves and joints to hidden copper pipework under floors. Even a slow drip can cause the pressure to fall over time.
💡 Tip: Check for visible damp patches, rust marks, or water near your radiators or boiler.
2. Faulty Pressure Relief Valve (PRV)
The pressure relief valve is designed to release excess pressure. If it becomes faulty or blocked with debris, it can cause water to escape constantly through the discharge pipe, reducing system pressure.
3. Expansion Vessel Failure
Inside your boiler is an expansion vessel, which absorbs changes in water pressure as the system heats up. If the internal diaphragm inside the vessel ruptures or loses charge, the pressure will rise and fall dramatically, often triggering error messages.
4. Air in the System
Air pockets trapped in the system can cause pressure fluctuations. This often happens after bleeding radiators or recent plumbing work.
5. Boiler Component or Sensor Faults
Modern boilers use sensors to monitor pressure and water flow. A faulty pressure sensor, diverter valve issue, or internal leak in the plate heat exchanger can all cause pressure loss or intermittent faults.
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🔧 Professional Repair Solutions
At Gas Care Plus, we provide a thorough diagnostic service to find the root cause of boiler pressure problems. Our repair solutions include:
1. System Leak Detection and Repair
We use advanced tools to locate hidden leaks — including thermal imaging and pressure testing — and carry out permanent repairs.
2. Pressure Relief Valve Replacement
If your PRV is leaking or jammed, we replace it with a genuine manufacturer-approved part.
3. Expansion Vessel Recharge or Replacement
We test and re-pressurise the expansion vessel. If it’s damaged, we replace it to stabilise your system pressure.
4. Boiler Sensor and PCB Diagnostics
Our engineers use specialist diagnostic software to identify faulty sensors or components and replace them efficiently.
5. System Re-pressurisation and Servicing
Once repaired, we re-pressurise the boiler and check for long-term stability. A full boiler service helps prevent recurring pressure drops.
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💬 Preventative Maintenance Tips
• Have your boiler serviced annually by a Gas Safe engineer
• Check your boiler pressure monthly
• Bleed radiators regularly to remove trapped air
• Avoid topping up your boiler too frequently – this can introduce fresh oxygen and cause corrosion
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🔥 Why Choose Gas Care Plus
✅ Gas Safe Registered Engineers
✅ Fast response for emergency boiler repairs
✅ Transparent pricing with no hidden costs
✅ Servicing, repairs, and installations for all major boiler brands (Vaillant, Baxi, Worcester Bosch, Ideal, Glow-worm, etc.)
If your boiler pressure keeps dropping or you’re seeing an error message, don’t ignore it — it could lead to more serious damage and costly repairs later.
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📞 Contact Gas Care Plus Today
For expert boiler repair, servicing, or heating system diagnostics, contact Gas Care Plus today:
📍 Website: www.gascareplus.com
📞 Phone: 07704141410
Serving homeowners across Leicester and the surrounding areas, Gas Care Plus keeps your home warm, safe, and energy-efficient all year round.
📧 Email: [email protected]
