BoilerFaultCodes 6
Flame Failure or Blocked Condensate Drain
Potterton Performa 24i HE Fault codes & diagnostics
18 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Combi Natural Gas 24 kW 2004-2008 Discontinued
GC Number 47-393-12
Replaced by: Potterton Titanium
Download the Potterton Performa 24i HE manual
PDF
Versions & GC numbers
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Severity at a glance
Each cell = one fault code. Hover to identify. 2 Emergency
10 High
6 Unrated
Which version do you have?
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 |
|---|---|---|
| 47-393-12 | Performa 24i HE | 2004–2008 |
Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.
Just want the most common Potterton Performa 24i HE faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 18 documented codes
Tap any card for details
7
Safety Thermostat Activated (Boiler or Flue)
8
Fault on Fan or Flue
9
Fault on Pump or Low System Pressure
10 Your boiler has stopped providing hot water because it is having trouble reading the temperature of the water inside the unit.
Your boiler has stopped providing hot water because it is having trouble reading the temperature of the water inside the unit.
Parts commonly replaced
- Domestic Hot Water (DHW) NTC Thermistor
- Wiring harness
11
Fault on Central Heating Sensor
24 Your boiler has stopped working because it cannot light its burner properly, which is often caused by a blockage in the pipe that drains away waste water.
Your boiler has stopped working because it cannot light its burner properly, which is often caused by a blockage in the pipe that drains away waste water.
Parts commonly replaced
- Condensate trap
- Ignition electrode
- Gas valve
Related codes
25 Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.
Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.
Parts commonly replaced
- Safety limit thermostat
- Central heating pump
- Diverter valve
- Primary heat exchanger
26 Your boiler is currently unable to safely remove waste gases, so it has shut itself down to prevent any risk to your home.
Your boiler is currently unable to safely remove waste gases, so it has shut itself down to prevent any risk to your home.
Parts commonly replaced
- Fan unit
- Flue pressure switch
- Printed Circuit Board (PCB)
Related codes
27 Your boiler has detected that water is either not moving around the system correctly or that the pressure of the water inside the unit is too low to run safely.
Your boiler has detected that water is either not moving around the system correctly or that the pressure of the water inside the unit is too low to run safely.
What to check first
- Locate the pressure gauge on the front of your boiler.
- Check if the needle is below the 1 bar mark.
- Use the filling loop (a metal braided hose or key under the boiler) to slightly open the valves and top up the system until the needle reaches 1.5 bar.
Parts commonly replaced
- Central heating pump
- Pressure relief valve
- Pressure sensor
Related codes
28 Your boiler has detected an issue with the sensor that monitors the temperature of the exhaust gases, causing it to stop working for your safety.
Your boiler has detected an issue with the sensor that monitors the temperature of the exhaust gases, causing it to stop working for your safety.
Parts commonly replaced
- Flue NTC Sensor
- Wiring harness
Related codes
29 Your boiler has stopped working because it is unable to accurately measure the temperature of the water used for your radiators.
Your boiler has stopped working because it is unable to accurately measure the temperature of the water used for your radiators.
Parts commonly replaced
- Central Heating NTC Thermistor
- Wiring Harness
Related codes
Air Flow Monitor Your boiler is struggling to breathe because the flue vent outside is blocked or the internal fan isn't pushing air correctly.
Your boiler is struggling to breathe because the flue vent outside is blocked or the internal fan isn't pushing air correctly.
Parts commonly replaced
- Flue fan
- Air pressure switch
- Venturi tube
Related codes
Flame Failure Your boiler is struggling to start because it cannot successfully ignite the gas flame or keep it running reliably.
Your boiler is struggling to start because it cannot successfully ignite the gas flame or keep it running reliably.
Parts commonly replaced
- Ignition electrode
- Gas valve
- Condensate trap
- Printed Circuit Board (PCB)
Related codes
Pump Fault or Low Pressure Your boiler has stopped working because the water pressure inside the system is too low or the internal water pump has failed to move heat around your home.
Your boiler has stopped working because the water pressure inside the system is too low or the internal water pump has failed to move heat around your home.
What to check first
- Check your boiler's pressure gauge; if it is below 1 bar, top it up using the filling loop
- Once the pressure is between 1 and 1.5 bar, switch the boiler off and back on at the mains to reset it
- If the pressure was normal, turn the heating thermostat up to check if the pump hums
Parts commonly replaced
- Central heating pump
- Pressure relief valve
- Pressure sensor
Related codes
Safety Thermostat Your boiler has detected that it is getting too hot and has automatically switched itself off to prevent any damage or safety hazards.
Your boiler has detected that it is getting too hot and has automatically switched itself off to prevent any damage or safety hazards.
Parts commonly replaced
- Pump
- Diverter valve
- Primary heat exchanger
- System filter
Related codes
Sensor Fault Your boiler is struggling to accurately detect the temperature of the water, which is preventing it from heating your home or water reliably.
Your boiler is struggling to accurately detect the temperature of the water, which is preventing it from heating your home or water reliably.
Parts commonly replaced
- NTC Thermistor
- Temperature sensor
Related codes
System Pressure (3 bar or greater)
A pressure of 3 or greater indicates a fault. The safety pressure relief valve will operate