Why Is My Vaillant Boiler Losing Pressure?
At Afterglow Plumbing & Heating, we often receive calls from homeowners asking: “Why is my Vaillant boiler losing pressure?” If you’ve noticed your boiler pressure dropping below the recommended level, it’s not something to ignore. A pressure issue can lead to breakdowns, poor heating performance, and higher repair costs if left unchecked.
As trusted specialists in boiler repair Birmingham, our team of Gas Safe engineers is here to explain the common causes, what they mean for your system, and when it might be time to consider an upgrade.
Common Causes of Vaillant Boiler Pressure Loss
1. Leaks in the Heating System
One of the most frequent reasons for a Vaillant boiler losing pressure is a leak somewhere in the pipework, radiators, or joints. Even a small, slow drip can cause the pressure gauge to drop steadily over time.
2. Faulty Expansion Vessel
Inside your Vaillant boiler is an expansion vessel that helps manage pressure changes when your system heats up. If this fails or loses its internal air charge, the boiler will struggle to maintain stable pressure.
3. Pressure Relief Valve (PRV) Issues
The PRV is a safety component designed to release excess pressure. If it’s faulty or stuck open, water can escape from the boiler system, causing the pressure to drop.
4. Leaking Diverter Valve
A common issue in Vaillant boilers is a leaking diverter valve. This component directs hot water between your central heating and taps. A leak here can cause pressure problems and lead to inconsistent heating or hot water supply.
Why You Should Always Call a Gas Safe Engineer
Trying to fix a Vaillant boiler losing pressure yourself may seem tempting, but modern boilers are complex and potentially dangerous if handled incorrectly. At Afterglow Plumbing & Heating, our fully qualified Gas Safe engineers in Birmingham have the expertise to diagnose and safely repair all makes and models of boilers.
We use genuine Vaillant parts where possible, ensuring a long-lasting repair and protecting your warranty.
Book a boiler repair in Birmingham today
When to Consider a Boiler Upgrade
If your Vaillant boiler is older, unreliable, or frequently breaking down, constant repairs may no longer be cost-effective. Signs it might be time for a new boiler include:
- Regular loss of pressure despite repairs
- Increasing energy bills due to inefficiency
- Frequent breakdowns or replacement part failures
- Difficulty sourcing parts for an ageing boiler
Our team at Afterglow offers expert advice on replacements boilers in Birmingham. We’ll recommend the best system for your home, ensuring efficiency, reliability, and long-term savings.
Areas in Birmingham We Cover
Afterglow Plumbing & Heating proudly serves homes and businesses across Birmingham and the surrounding areas. Some of the new areas we cover include:
- Erdington
- Selly Oak
- Perry Barr
- Yardley
- Stirchley
- Acocks Green
Wherever you’re based, our engineers can provide fast, reliable service.
About Afterglow Plumbing & Heating
At Afterglow, we pride ourselves on being a trusted, family-run business with years of experience in boiler servicing, repairs, and installations. Our customers rely on us for honest advice, fair pricing, and a high standard of workmanship. Whether it’s a simple leak or a full boiler replacement, we’re here to keep your home warm and your hot water running.
Frequently Asked Questions
How often should I top up my boiler pressure?
You shouldn’t need to top it up often. If your boiler keeps losing pressure, it’s a sign of a fault that needs investigating.
Can I repair a leaking Vaillant boiler myself?
No. For safety reasons, boiler repairs must always be carried out by a Gas Safe registered engineer.
How quickly can Afterglow attend a boiler repair in Birmingham?
We aim to provide same-day or next-day service whenever possible.
Do you offer boiler servicing as well as repairs?
Yes. Regular servicing helps prevent pressure loss and extends the life of your boiler.
Do you install new energy-efficient boilers?
Absolutely. We offer expert boiler installation in Birmingham, helping you save money on bills and reduce your carbon footprint.
If your Vaillant boiler is losing pressure, contact Afterglow Plumbing & Heating today for reliable boiler repair Birmingham services. If it’s time for an upgrade, we also specialise in professional boiler installation Birmingham.
Afterglow plumbing & Heating limited 83 Beechmore Road, Sheldon, Birmingham
