9 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Megaflo System ErP
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.
| GC number | Appliance (register name) | Produced |
|---|---|---|
| 41-075-52 | Megaflo System 15 HE | 2007–2008 |
| 41-075-53 | Megaflo System 18 HE | 2007–2008 |
| 41-075-54 | Megaflo System 32 HE | 2007–2008 |
| 41-470-18 | Megaflo 15 System ErP | 2015–present |
| 41-470-19 | Megaflo 18 System ErP | 2015–present |
| 41-470-20 | Megaflo 24 System ErP | 2015–present |
| 41-470-21 | Megaflo 28 System ErP | 2015–present |
| 41-470-22 | Megaflo 32 System ErP | 2015–present |
| 47-075-47 | Megaflo System 24 HE | 2006–2008 |
| 47-075-48 | Megaflo System 28 HE | 2006–2008 |
| 41-075-55 | Megaflo System 15 HE A | 2008–2015 |
| 41-075-56 | Megaflo System 18 HE A | 2008–2015 |
| 41-075-57 | Megaflo System 24 HE A | 2008–2015 |
| 41-075-58 | Megaflo System 28 HE A | 2008–2015 |
| 41-075-59 | Megaflo System 32 HE A | 2008–2015 |
| 47-075-61 | Megaflo System 18 HE LPG | 2009–2012 |
| 47-075-62 | Megaflo System 28 HE LPG | 2009–2012 |
| 47-075-63 | Megaflo System 32 HE LPG | 2009–2012 |
| 41-075-74 | Megaflo 2 System 28 Compact GA | 2011–2015 |
| 41-075-75 | Megaflo 2 System 32 Compact GA | 2011–2015 |
| 41-075-73 | Megaflo 2 System 24 Compact GA | 2011–2015 |
| 41-075-72 | Megaflo 2 System 18 Compact GA | 2011–2015 |
| 41-075-71 | Megaflo 2 System 15 Compact GA | 2011–2015 |
| 41-075-70 | Megaflo 2 System 12 Compact GA | 2011–2015 |
Tap any card for details
Your boiler has lost the ability to accurately measure the temperature of the central heating water, so it has shut down to prevent overheating.
Your boiler has detected an issue with its internal airflow or exhaust system, causing it to shut down for safety reasons.
Your boiler has detected that it is overheating and has automatically switched itself off to prevent damage.
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Your boiler is struggling to pump water around your heating system correctly, which is preventing it from heating your home or water safely.
Your boiler has detected that the temperature of the exhaust gases leaving the flue is too high, causing it to shut down to prevent overheating.
Your boiler has stopped working because it cannot light its internal flame, which is likely due to an issue with the gas supply or the ignition process.
Your boiler has detected an issue with the internal ventilation system that prevents it from starting up safely.
Your boiler is struggling to get water moving through the system properly before it attempts to fire up.
BoilerFaultCodes