Sime Boiler Repairs London
Over 20+ years experience with Sime Boilers
Insurance approved
90% repaired on the same day
0203 695 3137
How we can assist with your Sime Boilers
- Emergency Boiler Repairs
- Boiler Service
- Landlord Safety Certificates
- New Boilers Installations
- Leaking & Noisy Boilers
- Power Flushes
Boiler Repairs R Us are experienced in handling all types of Sime Boilers. We can also assist with all gas, condensing, combi boiler installations and upgrades. All our plumbers are Gas Safe Registered so you can be assured all our work is carried out within the required regulations. So for complete customer satisfaction call us on 0203 695 3137 to get your Sime Boilers repaired today!
Join 1,000’s of happy customers in London!
Trusted, reliable boilers repair & install specialists.
Get pricing and book repairSime Boilers and Boiler Repairs R Us
Our company specializes in the repair and maintenance of Sime Boilers, ensuring that your heating system operates efficiently and reliably. We understand the intricacies of these systems and have a team of experienced technicians ready to assist you with any issues you may encounter. In addition to Sime, we also service other popular boiler brands such as Ariston and Glow Worm.
London Specialists
Do you need repairs for your Sime boiler? Are you based in the London area? And do you want to ensure you get top-quality service at the best price? If so, you’ve come to the right place.
By choosing Boiler Repairs R Us for your Sime boiler repairs, you benefit from over twenty years of experience working with Sime models. Our highly skilled and qualified team are experts in Sime products, which means you can trust that the technician who arrives at your door will have the right expertise and tools for the job. We guarantee that all repair work is completed quickly and efficiently
It is crucial to hire a gas safe registered engineer for the repair and servicing of gas boilers to ensure safety and efficiency.
Our Maintenance Services
At Boiler Repairs R Us, we offer a comprehensive maintenance service for Sime boilers. Our Gas Safe engineers will:
- Inspect your boiler and identify any potential issues
- Clean and maintain the boiler and its components
- Check and replace any worn or damaged parts
- Test the boiler to ensure it is working efficiently and safely
- Provide a detailed report of the work carried out and any recommendations for future maintenance
We also offer a range of additional services, including:
- Power flushing to remove sludge and debris from your heating system
- System upgrades to improve efficiency and performance
- Boiler replacement and installation
By choosing Boiler Repairs R Us for your Sime boiler maintenance and servicing, you can trust that your boiler is in good hands. Our experienced engineers are dedicated to providing a high-quality service that meets your needs and budget. Contact us today to schedule your maintenance appointment and keep your Sime boiler running efficiently and safely.
Maintenance and Servicing
Regular maintenance is crucial for the efficient and safe operation of your Sime boiler. Neglecting maintenance can lead to a range of issues, including reduced performance, increased energy bills, and even safety risks. At Boiler Repairs R Us, we understand the importance of regular maintenance and offer a range of services to keep your Sime boiler running smoothly.
Our experienced Gas Safe engineers are trained to identify and address any potential issues before they become major problems. By scheduling regular maintenance, you can:
- Ensure your Sime boiler is working efficiently and effectively
- Reduce the risk of breakdowns and costly repairs
- Extend the lifespan of your boiler
- Maintain your boiler’s warranty (if applicable)
- Prevent carbon monoxide poisoning and other safety risks
Sime boilers
Sime has an incredible range of top quality heating products. As the company puts it in its slogan ‘Valuing Your Climate’, it pulls out all the stops to make sure your home is heated with efficiency and sustainability.
Amongst its long list of products, Sime offers:
- Wall hung boilers
- Floor standing
- Accessories
- Light commercial
- Hiu’s, Solar Thermal and Renewables
Knowing the manufacturer is crucial when seeking repair services, as it ensures you receive personalized services based on the manufacturer’s specifications.
When you add one of its top quality models to your workplace or home, you want to make sure you get service and maintenance that matches its efficiency. That’s the level of service you get when you hire Boiler Repairs R Us. The advantages of coming to our experienced team are many, including:
- Cost transparency: We pride ourselves on being totally transparent with our charges: no hidden costs and up front quoting, helping you save money.
- Speed: Thanks to our huge network of tradespeople, you can rest assured that, regardless of your location, as long as you’re in the London area we will be at the door with no delays.
- Experience: Our team has more than two decades of experience installing, repairing and maintaining Sime boilers. This means, you can rest assured that your model will be fixed with no delays.
Punctual work carried out to a very high standard and very reliable and easy to communicate with. WIll recommend to my friendsJason – Croydon, SurreyVery friendly, helpful and professional, it was a pleasure having them in the house. Would recommend to anyone who needs a new boiler.Joanne – Wimbledon, London
Sime Boiler Models We Service and Repair
- Sime Murelle HE R ErP: High-power wall-hung condensing gas boiler designed for heating only.
- Sime Brava Slim HE ErP: Wall-hung condensing gas boiler for instantaneous hot water and central heating.
- Sime Murelle One HE: Condensing wall-hung gas boiler for heating only.
- Sime Murelle Elite HE: Condensing wall-hung gas boiler for heating only.
- Sime Murelle PRO HE: Condensing wall-hung gas boiler for heating only.
Hybrid Systems:
- Sime Murelle Revolution: A hybrid system combining a gas condensing boiler with an air/water heat pump.
- Sime Murelle HT: Instantaneous wall-hung condensing boiler with advanced technology for heating only.
- Sime Murelle HM ErP: Wall-hung condensing boiler for instantaneous hot water and central heating.
- Sime Murelle HT: Instantaneous wall-hung condensing boiler with high technology and heating only.
- Sime Murelle EQUIPE 70 ErP: Modular unit composed of multiple premixed condensing boilers.
Areas we Cover in London
| EC district:
EC1A EC1M EC1N EC1P EC1R EC1V EC1Y : Barbican, Clerkenwell, Finsbury WC district: WC1A WC1B WC1E WC1H WC1N WC1R WC1V WC1X: Bloomsbury, Gray’s Inn E district E1: Mile End, Stepney, Whitechapel N district N1: Barnsbury, Canonbury, Islington NW district NW1: Camden Town, Regent’s Park |
SE district
SE1: Bermondsey, Borough, Southwark, Waterloo SW district SW1: Belgravia, Pimlico, Westminster W district W1: Marylebone, Mayfair, Soho Outer London BR: Bromley |
Sime Combi Boiler Problems
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Sime Fault Code Help
Quick checks, common Sime boiler fault codes (AL and F codes), and when to call a Gas Safe engineer for Sime boiler repairs in London.
Safety First
Smell gas? Do not touch anything. Do not use switches. Open windows, leave the property, and call the National Gas Emergency Line: 0800 111 999.
CO alarm sounding? Treat it as real. Open windows and doors, get everyone out immediately (including pets), then call 0800 111 999 from outside.
If anyone feels unwell (headache, dizziness, nausea, confusion, chest pain, breathless, collapse), call 999.
More information: Carbon monoxide safety guide.
No gas smell, no alarm? Your Sime boiler may have locked out as a safety precaution. Try the quick checks below.
Quick Checks Before You Call
These take 60 seconds and fix many common lockouts:
- Check the pressure gauge – if below 1 bar, top up using the steps below. Full guide:
Boiler pressure guide. - Note the fault code – Sime boilers often show AL or F codes. Write it down exactly before calling.
- Check your fuse box – boilers need electricity. A tripped switch is an easy fix.
- Check thermostat and timer – settings can change after power cuts or clock changes.
- Freezing weather? – the condensate pipe may be frozen. See:
How to fix a frozen condensate pipe. - Reset once only – on many Sime models you turn the selector to RESET and release. If it locks out again, stop and call an engineer.
About Sime Boilers
Sime is an Italian manufacturer (founded in 1973) and many London properties still have Sime boilers installed from the 1990s and 2000s. Popular UK models included the Friendly, Super 90, and Format ranges. Parts are often available, but older boilers can become uneconomical if failures repeat. If your Sime is 15 to 25 years old, we normally assess repair value based on fault type, parts availability, and overall condition.
Important: Older Sime Model Safety Notice
If you have a Sime 80C, 100C, or 110C model (or you are not sure), do not keep resetting an overheat or lockout fault.
Stop using the boiler and arrange an inspection by a Gas Safe registered engineer. If your appliance is subject to a manufacturer safety update, we can advise on the correct route to get it checked.
Common Sime Boiler Fault Codes
Note: Sime uses AL and F codes depending on the model range. If you are unsure, call and read exactly what the display shows.
| Code | What it Usually Means | Urgency | Safe DIY Check? |
|---|---|---|---|
| F10 / AL10 | Low water pressure | Low | Yes – top up to 1.0 to 1.2 bar (or 1.2 to 1.5 bar on some sealed systems) |
| AL01 | Flow sensing / circulation detection issue (model dependent) | Medium | No – call engineer |
| F01 | Overheat / safety thermostat tripped | High | No – do not keep resetting |
| F02 | DHW (hot water) probe short circuit (model dependent wording) | Medium | No – call engineer |
| F04 | No flame / ignition failure | Medium | Check gas is on, reset once |
| AL02 | DHW sensor fault | Medium | No – call engineer |
| AL03 | Heating sensor fault | Medium | No – call engineer |
| AL05 | Fan / flue airflow fault | High | No – call engineer |
| AL06 | Condensate drain issue or condensate system blockage (common in freezing weather) | Medium | Check condensate pipe externally (do not dismantle the boiler) |
| AL37 | Low mains voltage / electrical supply irregularity | Medium | Check sockets/fuse box; call if it persists |
Tip: If the same Sime fault code returns after one reset, stop and book an engineer. Repeated resets can worsen ignition and overheat faults.
How to Top Up Boiler Pressure
If your gauge shows below 1 bar or you see F10 or AL10:
- Identify the filling method – Sime models vary. Some use a built-in/telescopic filling knob, others use a braided filling loop with two valves.
- Open slowly – you should hear water entering the system.
- Watch the gauge – stop at 1.0 to 1.2 bar (or follow your boiler’s guidance). Do not exceed 2 bar.
- Close fully – return the knob/valves to the closed position.
- Reset once if needed – turn the selector to RESET and release.
If pressure drops again within 24 to 48 hours, you likely have a leak or a component issue (PRV, expansion vessel, or air vent). More detail:
Complete pressure guide.
Frozen Condensate Pipe
If temperatures have been below freezing and your boiler shows F04 or AL06, the condensate pipe may be frozen or blocked:
- Find the plastic pipe (usually white or grey) exiting through an external wall near the boiler.
- Pour warm (not boiling) water over the frozen section, starting from the top.
- Alternatively, wrap with a hot water bottle or warm towel.
- Reset the boiler once after thawing.
If this happens every winter, we can reroute or insulate the pipe permanently. Full guide:
How to fix a frozen condensate pipe.
Is This Urgent?
Not every fault needs an emergency callout:
| Situation | Urgency |
|---|---|
| No heating but hot water works | Usually safe to wait |
| No heating or hot water, vulnerable person at home | Call now |
| Any smell of gas | Emergency – call 0800 111 999 |
| CO alarm sounding | Evacuate – call 0800 111 999 |
| Boiler leaking water | Call today |
| Fault clears after one reset | Book a service soon |
| Repeated lockouts (two or more times) | Call today |
| Overheat fault code (F01) | Call now – do not keep resetting |
Sludge, Kettling, or Cold Radiators?
Limescale and system sludge can contribute to overheating, noise, poor circulation and repeated lockouts. A
power flush cleans the system and helps protect your boiler.
Read our power flush guide.
Frequently Asked Questions
Is it worth repairing a Sime boiler over 15 years old?
It depends. Many Sime boilers from the 1990s and 2000s are now 15 to 25 years old. If this is the first major failure, a sensible repair can still be worth it.
If faults are recurring or parts are becoming difficult to source, replacement may be more cost-effective. We will give you an honest assessment.
More detail: Repair or replace guide.
How often should I service my Sime boiler?
Once a year, ideally before winter. Annual servicing improves safety, efficiency and reliability. See:
Boiler servicing.
My boiler keeps losing pressure. What should I do?
If you need to top up regularly, you likely have a leak or a component issue (PRV, expansion vessel, or an air vent). Do not ignore it. Read our
pressure guide or call us for a diagnosis.
Do I need a Gas Safety Certificate for my rental property?
Yes. Landlords must have all gas appliances checked annually by a Gas Safe registered engineer. See:
Landlord Gas Safety Certificates.
Renting This Property?
Tenants: Contact your landlord or letting agent first. They are responsible for arranging repairs. Keep a written record of your report.
Landlords: Stay compliant with our
landlord checklist and book your annual
Gas Safety Certificate.
Sime Boiler Repairs Across London
We repair Sime boilers across North, South, East, West and Central London. See our full
London coverage.
Book Your Sime Boiler Repair
Gas Safe engineers across London. No call centres.
Our Services
Boiler Servicing
New Boiler Installation
Gas Safety Certificates
Central Heating
Contact Us