21 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Promax Ultra Store
This boiler uses LED flash patterns
Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. 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 |
|---|---|---|
| 41-591-76 | Promax HE Store 115 Litre | 2006–2015 |
| 41-591-77 | Promax HE Store 150 Litre | 2006–2015 |
| 41-601-24 | Promax HE Store 90 Litre | 2006–2015 |
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Your boiler has stopped working because it cannot properly clear exhaust gases, so it has safely shut itself down to prevent any risk.
Your boiler is not receiving enough electricity to power itself properly, so it has shut down to protect its internal electronics.
Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.
Your boiler's internal computer has developed a fault and is failing to communicate properly, meaning it cannot safely start up or provide heating and hot water.
Your boiler's internal computer has encountered a critical error preventing it from operating effectively.
Your boiler has stopped working because the internal component responsible for moving air and gases through the system has failed to start correctly.
Your boiler is failing to start because it is not receiving enough electrical power from your home's main supply.
Your boiler has detected that it is getting too hot and has automatically shut down for safety reasons to prevent internal damage.
Your boiler has detected an internal computer error and needs a professional repair to function again.
Your boiler’s internal control system has detected a critical electronic failure, meaning it can no longer safely operate or heat your home.
Your boiler has detected that there is not enough water inside the system to operate safely, which has caused it to shut down to prevent damage.
Your boiler is detecting that the electrical wires providing its power have been swapped around, which is preventing it from starting safely.
Your boiler's electronic command center has encountered a critical internal error and can no longer safely control the heating or hot water system.
Your boiler has detected that there is not enough water inside the system to operate safely, which triggers a protective shutdown to prevent internal damage.
Your boiler is struggling to accurately measure its own temperature, so it has stopped working to prevent potential damage.
Your boiler has detected that the electricity supply wires have been connected the wrong way round.
Your boiler's internal computer has developed a fault and is no longer able to control the heating or hot water functions.
Your boiler has failed to start because it cannot detect a flame, so it has safely shut itself off to prevent gas being released.
Your boiler has lost all power and is completely unresponsive as if it has been unplugged.
Your boiler is failing to light the flame properly and has safely shut itself down to prevent a gas build-up.
Your boiler's internal communication system is experiencing a connection error, meaning the main control board cannot properly talk to the internal components.
BoilerFaultCodes