Warmflow Boiler Repairs
Experienced Warmflow Boiler Repairs specialists
Available 24 hours a day, 7 days a week
Insurance approved
All parts guaranteed for a year
Fully Gas Safe trained engineers
Warmflow Boiler Repairs London
Gas Safe registered engineers • 24/7 call handling • London wide
Call Now: 0203 868 6251 | Request a Call Back
Tell us the model and whether it is oil-fired or gas, plus any code or lights showing. We will advise the safest next step.
We cover Warmflow boiler repairs in London, including burner lockouts, no heating, no hot water, low pressure, leaks and control panel fault indicators. This includes Warmflow oil boiler repairs in London, especially burner lockout faults on older systems.
Quick Navigation
Safety First
Smell gas or strong fumes? Turn off the supply at the isolation valve or oil tank valve if it is safe to do so. Open windows. Leave the property. For gas, call the National Gas Emergency Service on 0800 111 999. For oil-fired appliances, OFTEC registration is required. Call us and we will advise the safest next step. Do not use switches, and do not use naked flames.
CO alarm sounding? Open windows immediately. Leave the property. Call 999. Do not re-enter until cleared by emergency services.
Boiler leaking heavily? Turn off the boiler at the controls. If safe, turn off the water supply. Call an engineer.
Quick Checks Before You Call
Before calling an engineer, these safe checks may resolve simple issues with your Warmflow boiler.
Check your fuel supply
For gas: is gas working at other appliances? Check your meter and any prepayment credit. For oil: check your tank level and that the isolation valve is open.
Check the pressure gauge
Warmflow boilers show pressure on a gauge or display. It should read between 1 and 1.5 bar when cold. If below 1 bar, you may need to re pressurise using the filling loop.
Check the thermostat
Is the room thermostat set above current room temperature? Are the batteries working?
Check the timer or programmer
Is the heating scheduled to be on? Check the clock is set correctly.
Try a single reset
Locate the reset button on your Warmflow boiler or burner. Press once and wait. If the fault returns, do not keep resetting. Call an engineer. If a lockout returns after one reset, stop. Repeated resets can worsen underlying faults.
Check what type of Warmflow you have
Warmflow manufacture both oil-fired and gas boilers. Oil-fired models will not have a condensate pipe like a modern gas condensing boiler. If you do have a white condensate pipe outside, it can freeze in cold weather. Thaw gently with warm water, not boiling.
Warmflow Fault Codes and Warning Lights Explained
Warmflow boilers include both oil-fired and gas models. Fault indicators vary by model and control type. Many Warmflow oil boilers use burner lockout lights or control panel indicators rather than digital codes. The table below is a guide to common symptoms. Tell us exactly what you see.
If you smell gas, oil fumes, or suspect carbon monoxide, do not reset. Follow the Safety First steps above and call for help.
| Example symptom / indicator |
Common meaning |
What to do |
| Burner lockout light |
Burner failed to ignite or flame lost. Common on oil-fired models. |
Check fuel supply. Reset once only. If it returns, call an engineer. |
| Flashing red light |
Ignition lockout on some models. |
Check fuel supply. Reset once only. If it returns, call an engineer. |
| Steady red light |
Safety lockout. Overheat or other safety fault. |
Do not keep resetting. Call an engineer to check circulation and safety controls. |
| Low pressure warning |
Low water pressure in the system. |
Check gauge and re pressurise if confident. If it drops again, call an engineer. |
| No lights / no power |
No power to boiler or control fault. |
Check power supply and fuse. Call an engineer. |
| Boiler fires but no heat |
Circulation issue or pump fault. |
Call an engineer to check circulation and controls. |
Need help now? Call 0203 868 6251 and tell us the model, fuel type, and what you see.
Most Searched Warmflow Problems
If you are seeing a Warmflow burner lockout, loss of hot water, or your boiler keeps resetting, tell us the model and fuel type and we will confirm the safest next step.
Burner lockout
Burner lockouts are common on Warmflow oil-fired boilers. The burner tries to ignite but fails, triggering a lockout light. Common causes include fuel supply issues, a dirty or worn burner nozzle, or photocell faults. On oil boilers, check your tank level and that the isolation valve is open. Try one reset. If the lockout returns, stop and call an engineer for Warmflow boiler repair.
Low pressure
Low pressure faults appear when system pressure drops below the minimum threshold. You can re pressurise using the filling loop if your system has one. If you top up and pressure falls again within days, there may be a leak in the system or a failing expansion vessel. Do not keep topping up. Call an engineer to find the cause.
No hot water but heating works
On Warmflow system boilers with a separate hot water cylinder, you may get heating but no hot water. This can point to a motorised valve issue, cylinder thermostat fault, or circulation problem. Call an engineer for diagnosis.
Why Warmflow Boilers Develop Faults
Warmflow is a Northern Ireland based manufacturer producing both oil-fired and gas boilers. Many Warmflow installations are oil-fired. Here is what we commonly see.
Burner and nozzle issues (oil boilers)
On oil-fired Warmflow boilers, burner lockouts are often caused by a dirty or worn nozzle, photocell contamination, or fuel supply issues. Regular servicing helps prevent these faults.
Ignition faults (gas boilers)
On gas-fired Warmflow models, ignition faults are common after 5 years. The ignition electrode creates the spark, and over time it wears or becomes coated with carbon.
Expansion vessel and pressure issues
Low pressure faults often point to a failing expansion vessel. The expansion vessel absorbs pressure changes as water heats and cools. If the diaphragm fails or the air charge is lost, pressure drops occur frequently.
PCB and electrical faults
The printed circuit board controls boiler functions. On older Warmflow models, PCB faults become more common after 8 to 10 years. Symptoms include erratic displays or random lockouts.
Warmflow Models We Repair
We repair Warmflow boilers in London where parts are available. If you can, tell us the model name and whether it is oil-fired or gas, plus any code, lights, or burner lockout showing. We will advise the safest next step and check parts availability before booking where possible.
Important: Gas Safe registration applies to gas appliances. Oil-fired Warmflow boilers require OFTEC registration. Please confirm your fuel type when you call so we can book the right engineer or advise the correct next step.
Repair or Replace Your Warmflow Boiler?
We help you decide based on age, reliability, and parts availability.
Repair makes sense when
- Boiler is under 10 years old
- This is the first major fault
- Parts are readily available
- Boiler has been regularly serviced
Replacement may be better when
- Boiler is 12 to 15 years old or more
- You have had multiple breakdowns recently
- Parts are obsolete or hard to source
- The boiler is undersized for the property
- Energy bills are higher than expected
Our engineers give honest assessments. If we cannot source parts or the repair is not cost effective, we will tell you.
Warmflow Boiler Servicing
Regular servicing reduces breakdown risk and keeps your Warmflow boiler running efficiently. We recommend annual servicing for all boilers. Oil boilers require OFTEC-registered servicing.
A service visit includes inspection of key components, combustion analysis where appropriate, pressure checks, and cleaning where needed. We provide written service records.
Landlords and Letting Agents
We provide boiler repairs and gas safety certification for landlords across London.
Gas Safety Certificates (CP12)
Annual gas safety checks are a legal requirement for rental properties with gas appliances. We issue CP12 certificates and can send documentation directly to managing agents.
Repair and compliance
We can invoice agents directly and provide records for compliance files.
Warmflow Repairs Across London
London wide coverage for Warmflow boiler repairs where parts are available. Book an engineer or view our London areas page.
Other Boiler Brands We Repair
Worcester • Vaillant • Ideal • Baxi • Glow worm • Viessmann • Potterton • Vokera • Alpha • Ferroli
View all brands
Warmflow Boiler Repair FAQs
Do you repair Warmflow oil boilers?
Gas Safe registration applies to gas appliances. Oil-fired Warmflow boilers require OFTEC registration. Please confirm your fuel type when you call so we can book the right engineer or advise the correct next step.
How quickly can you attend for a Warmflow breakdown?
We offer same day attendance where slots are available. For no heating or hot water, we prioritise urgent breakdowns. Call our 24/7 line and we will advise availability.
Is it safe to reset my Warmflow boiler after a lockout?
A single reset is generally safe. If the lockout returns after resetting, stop and call an engineer. Repeated resets can worsen underlying faults. If you smell gas or strong fumes, do not reset.
How much does a Warmflow boiler repair cost?
Costs vary depending on the fault and parts required. We diagnose first and quote before any repair work begins.
Speak to Our Team
For safe next steps, call now or request a call back.
Call 0203 868 6251 | Book an Engineer
Gas Safe registered • 24/7 call handling • Quote before work
