No Hot Water? Here’s When to Call for a Boiler Repair in London

Waking up to no hot water is frustrating at best — and in colder months, it can bring your entire day to a halt. Whether you’re a homeowner, landlord, or facilities manager, knowing when to attempt a simple fix and when to call for boiler repair is essential.

At Pleasant Plumbers, we attend emergency callouts for no hot water every single day across London. Here’s how to troubleshoot the issue — and when to call in a professional.

Before reaching for the phone, rule out some common causes that don’t require a repair.

✅ Has your boiler lost power?
Check the display screen. If it’s blank, the boiler may have tripped the fuse board. Try resetting it.

✅ Is the thermostat set correctly?
Ensure the hot water schedule is active and the thermostat isn’t set too low.

✅ Is the water pressure too low?
Most boilers need pressure between 1.0–1.5 bar. If it’s too low, top it up using the filling loop.

✅ Is there an error code on the boiler?
Take note of the fault code and consult the boiler manual. Common codes include F22 (Vaillant), EA (Worcester Bosch), and L2 (Ideal) — all indicating a potential fault requiring attention.

If you’ve ruled out user settings and power issues, it’s time to bring in a Gas Safe registered engineer. Call Pleasant Plumbers if you notice:

• No hot water AND no heating
• Repeated error codes
• Strange noises (banging, hissing, clicking)
• Leaking or dripping from the boiler
• Water is lukewarm, not hot
• Hot water cuts out mid-shower
• The pilot light keeps going out (on older boilers)

In most cases, your boiler isn’t working due to a faulty component, such as:

• A broken diverter valve
• A faulty thermistor or flow sensor
• A limescaled heat exchanger
• A worn-out pump
• Frozen condensate pipe (in winter)

Only a professional can safely diagnose and resolve the issue.

If your hot water sometimes works, but cuts out or takes a long time to heat up, this is an early warning sign of system strain. Don’t wait until the boiler fails completely.

Intermittent issues could be due to:

• Faulty temperature sensors
• Partially blocked pipes
• Early-stage pump failure
• Sludge buildup in the system

Calling a London boiler repair specialist early could save you from needing an emergency call-out later.

Under UK law, landlords must provide tenants with working heating and hot water at all times. If a tenant reports a hot water fault, you're legally required to fix it promptly.

At Pleasant Plumbers, we offer priority call-outs and digital job tracking for landlords across London — making compliance easier.

If your boiler is:

• Over 12–15 years old
• Breaking down frequently
• Expensive to repair or source parts for
  …it may be time to discuss replacement options.

We offer next-day boiler installations in London with flexible finance and long warranties — often saving money long-term vs ongoing repairs.

From fault diagnosis to emergency repairs, Pleasant Plumbers is trusted by households and businesses across London for fast, transparent boiler repairs.

📲 Call or WhatsApp 0800 046 1000
📧 Email [email protected]
🌐 Visit pleasantplumbers.com

Searching 'Plumber Near Me?' Plumber London or Commercial Plumber London? We operate all across London! If you need a trusted plumber in London then get in touch with us today on 0800 046 1000 or email us on [email protected]
Pleasant Plumbers – Where Trust Flows Like Water.

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