Myson Boiler Repairs
Experienced Myson 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
Myson 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 symptoms and model. We will advise the safest next step.
Common searches include Myson boiler not working, Myson boiler lockout, Myson Apollo fault, Myson Midas no hot water, Myson Marathon problems, and Myson boiler reset. If you can, tell us the model name from the data badge and describe what the boiler is doing.
We cover Myson boiler repairs in London, including lockouts, no heating, no hot water, ignition faults and pilot light problems. We also offer boiler servicing and boiler installation across London.
Quick Navigation
Safety First
Smell gas? Turn off the gas supply at the meter if it is safe to do so. Open windows. Leave the property. Call the National Gas Emergency Service on 0800 111 999. 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 Myson boiler.
Check the gas supply
Is gas working at other appliances in your home? If not, check your meter and any prepayment credit.
Check the pressure gauge
On sealed system models, pressure should read around 1.0 to 1.5 bar when cold. If it is low, you may need to top up using the filling loop (location varies by installation).
Check the thermostat
Is the room thermostat set above current room temperature? Is the boiler thermostat turned up?
Check the timer or programmer
Is the heating scheduled to be on? Check the clock is set correctly.
Check the pilot light
On older Myson models with a permanent pilot, look through the inspection window. If the pilot is out, follow the lighting instructions on the boiler. If it will not stay lit, call an engineer.
Try a reset (if lockout)
If the boiler has locked out, turn the thermostat to minimum, wait 30 seconds, then turn back up. On some models, there is a reset button on the control box. Do not reset more than twice. If it keeps locking out, call an engineer.
Myson Fault Indicators Explained
Most Myson boilers do not have digital fault code displays. Instead, they use indicator lights and lockout conditions. The meaning varies by model (Apollo, Midas, Marathon, Velaire). Use the table below as a quick guide only.
If you smell gas, do not reset. Follow the Safety First steps above and call for help.
| Indicator / symptom |
Typical meaning |
Safest next step |
| Pilot light out |
Pilot has extinguished. May be thermocouple, gas valve, or draught issue. |
Try relighting following boiler instructions. If it won’t stay lit, call an engineer. |
| Lockout (no ignition) |
Boiler attempted to light but failed. May be ignition electrode, gas valve, or air pressure switch. |
Try one reset. If it locks out again, call an engineer. |
| Fan runs but no ignition |
Air pressure switch or ignition circuit fault. |
Do not keep resetting. Call an engineer. |
| Overheat lockout |
Boiler overheated and shut down for safety. May be circulation, pump, or thermostat issue. |
Allow to cool. Try one reset. If it returns, call an engineer to check circulation. |
| No power / no lights |
Electrical supply issue or fuse blown. |
Check the fused spur and boiler fuse. If power is present, call an engineer. |
| Symptom not listed |
Myson boilers vary by model and age. |
Call us with the model name and symptoms and we will advise the safest next step. |
Most Searched Problems
Myson boiler not firing
Often caused by air pressure switch failure (common on balanced flue models), ignition electrode wear, or gas valve faults. The fan may run but the boiler fails to ignite. Try one reset. If the boiler still fails to ignite, call an engineer.
Myson pilot light keeps going out
Usually caused by a faulty thermocouple. The thermocouple senses the pilot flame and allows gas to flow. If worn or dirty, it fails to detect the flame and shuts off the gas. An engineer can test and replace it.
Myson boiler no hot water
On combi models (Midas), the diverter valve switches water between heating and hot water. If stuck, you may have heating but no hot water. On system boilers (Apollo, Marathon), check the cylinder thermostat and motorised valves.
Myson boiler making noise
Banging or kettling noises often indicate limescale buildup in the heat exchanger. Gurgling may suggest air in the system. Both require engineer investigation.
Why Myson Boilers Develop Faults
Age
Myson boilers were manufactured from the late 1980s to late 1990s. Most units still in service are now 25 to 35 years old. Component failure is increasingly common.
Parts availability
Some Myson parts are now obsolete or hard to source. Common spares like thermocouples, ignition electrodes, and diaphragms are usually available. PCBs and gas valves may require refurbished or pattern parts.
Lack of servicing
Skipping annual services allows small problems to become bigger faults. Servicing keeps components clean and calibrated.
System sludge
Dirty system water circulates debris through the boiler. This clogs heat exchangers and damages pumps. A powerflush can help extend boiler life.
Myson Models We Repair
Our engineers work on all Myson gas boiler models including:
Apollo range: Apollo 15/30 Si, Apollo 30 Si, Apollo 40 Si, Apollo 50 Si, Apollo 60B, Apollo Fanfare
Midas range: Midas Si, Midas SFi, Midas b (combi models)
Marathon range: Marathon 400 to 1500 (floor standing)
Other models: Velaire, Housewarmer, Orion, and older Myson units
Myson boilers were manufactured in the UK and later became part of Baxi. If you are unsure of your model, check the data badge on the front or underside of the boiler casing. It will show the model name and GC number.
Repair or Replace
Myson boilers are no longer manufactured and most are now over 25 years old. A repair may make sense if the fault is straightforward and parts are available (thermocouple, ignition electrode, diaphragm). However, repeated breakdowns, major component failures (heat exchanger, PCB, gas valve), or difficulty sourcing parts typically make replacement the better option.
Modern boilers are significantly more efficient. Replacing an old Myson with a new condensing boiler could reduce your gas bills by 20 to 30 percent.
We can advise whether repair or replacement is the better option for your situation. If a new boiler is needed, we offer boiler installation with a range of manufacturers.
Annual Servicing
Annual servicing keeps your Myson boiler running safely and extends its working life. We recommend servicing every 12 months to catch problems early. Book a service here.
Landlord Gas Safety Certificates
Landlords must have gas appliances checked annually by a Gas Safe registered engineer. We provide CP12 certificates for landlords across London.
Call Us
Call Now: 0203 868 6251
Lines are open 24 hours. Tell us the model and symptoms. We will advise the safest next step and, if needed, send an engineer.
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