BoilerFaultCodes E01 Your boiler has failed to light its burner and safely start up.
Your boiler has failed to light its burner and safely start up.
Parts commonly replaced
- Ignition electrode
- Gas valve
- Printed circuit board
ECA Proteus Premix 24 HCH Fault codes & diagnostics
28 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Regular Natural GasLPG 24 kW 2017-present
GC Number 41-814-01
Download the ECA Proteus Premix 24 HCH manual
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Versions & GC numbers
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Severity at a glance
Each cell = one fault code. Hover to identify. 2 Emergency
19 High
5 Medium
2 Low
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 |
|---|---|---|
| 41-814-01 | PROTEUS PREMIX 24 HCH NG ERP UK | 2017–present |
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 ECA Proteus Premix 24 HCH faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 28 documented codes
Tap any card for details
E02 Your boiler is temporarily locked out because it thinks it detects a flame burning inside before it has even tried to turn on.
Your boiler is temporarily locked out because it thinks it detects a flame burning inside before it has even tried to turn on.
Parts commonly replaced
- Flame sensor electrode
- Printed circuit board (PCB)
Related codes
E03 Your boiler has temporarily shut down because the water inside it has become too hot, triggering a vital safety cutoff to prevent overheating.
Your boiler has temporarily shut down because the water inside it has become too hot, triggering a vital safety cutoff to prevent overheating.
Parts commonly replaced
- High limit thermostat
- NTC temperature sensor
- Circulating pump
- PCB
Related codes
E05 Your boiler has stopped working because it cannot detect that the internal fan is spinning correctly to clear exhaust gases safely.
Your boiler has stopped working because it cannot detect that the internal fan is spinning correctly to clear exhaust gases safely.
Parts commonly replaced
- Fan Assembly
- Printed Circuit Board (PCB)
Related codes
E08 Your boiler has detected an issue with the flame during operation and safely shut itself down to prevent any hazards.
Your boiler has detected an issue with the flame during operation and safely shut itself down to prevent any hazards.
Parts commonly replaced
- Ignition Lead
- Electrodes
- Gas Valve
- PCB
Related codes
E09 Your boiler is failing to register that the internal gas valve is operating correctly, meaning it will lock out for safety and stop providing heating and hot water.
Your boiler is failing to register that the internal gas valve is operating correctly, meaning it will lock out for safety and stop providing heating and hot water.
Parts commonly replaced
- Gas Valve
- Wiring Harness
- Printed Circuit Board (PCB)
Related codes
E12 Your boiler has detected a memory error within its main control board, meaning it cannot safely store or read its internal settings.
Your boiler has detected a memory error within its main control board, meaning it cannot safely store or read its internal settings.
Parts commonly replaced
- Printed Circuit Board (PCB)
Related codes
E15 Your boiler has detected an inconsistent temperature reading between its internal sensors, meaning it cannot accurately monitor how hot the water is getting.
Your boiler has detected an inconsistent temperature reading between its internal sensors, meaning it cannot accurately monitor how hot the water is getting.
Parts commonly replaced
- NTC Temperature Sensor
- Central Heating Thermistor
Related codes
E16 Your boiler has temporarily stopped working because it cannot accurately read the temperature of the water heading into your heating system.
Your boiler has temporarily stopped working because it cannot accurately read the temperature of the water heading into your heating system.
Parts commonly replaced
- Central Heating NTC Temperature Sensor
- Wiring harness
Related codes
E17 Your boiler has detected a problem with the sensor that measures the temperature of the water returning from your radiators.
Your boiler has detected a problem with the sensor that measures the temperature of the water returning from your radiators.
Parts commonly replaced
- Central Heating Return Temperature Sensor
- Wiring harness
Related codes
Showing 11–20 of 28
E18 Your boiler has temporarily stopped working because it cannot accurately read the temperature of the water inside.
Your boiler has temporarily stopped working because it cannot accurately read the temperature of the water inside.
Parts commonly replaced
- NTC Temperature Sensor
- Wiring Harness
Related codes
E21 Your boiler's internal computer is experiencing a critical electronic failure and cannot properly process its internal signals.
Your boiler's internal computer is experiencing a critical electronic failure and cannot properly process its internal signals.
Parts commonly replaced
- Printed Circuit Board (PCB)
E33 Your boiler has temporarily stopped working because it cannot accurately read the temperature of the water returning from your radiators.
Your boiler has temporarily stopped working because it cannot accurately read the temperature of the water returning from your radiators.
Parts commonly replaced
- Central Heating Return Temperature Sensor
- Wiring Harness
Related codes
E35 Your boiler has temporarily stopped working because it cannot accurately read the temperature of the water flowing into your central heating system.
Your boiler has temporarily stopped working because it cannot accurately read the temperature of the water flowing into your central heating system.
Parts commonly replaced
- Central Heating Flow Temperature Sensor
- Wiring Harness
Related codes
E80 Your boiler is temporarily pausing because it has detected an unusual temperature difference between the water leaving the boiler and the water returning to it.
Your boiler is temporarily pausing because it has detected an unusual temperature difference between the water leaving the boiler and the water returning to it.
Parts commonly replaced
- CH Return Temperature Sensor
- CH Flow Temperature Sensor
- Circulating Pump
Related codes
E82 Your boiler has stopped working because the flame kept going out repeatedly in a short space of time.
Your boiler has stopped working because the flame kept going out repeatedly in a short space of time.
Parts commonly replaced
- Flame sensor/electrode
- Gas valve
- Ignition lead
Related codes
F07 Your boiler has automatically shut down because the exhaust gases getting rid of the smoke and fumes have become dangerously hot.
Your boiler has automatically shut down because the exhaust gases getting rid of the smoke and fumes have become dangerously hot.
Parts commonly replaced
- Flue gas sensor
- NTC thermistor
- Heat exchanger
- Main PCB
Related codes
F13 Your boiler has locked itself out because the reset button has been pressed too many times in a short period.
Your boiler has locked itself out because the reset button has been pressed too many times in a short period.
What to check first
- Turn off the boiler at the main power switch or unplug it from the wall.
- Wait for approximately 5 to 10 minutes to let the internal system and electronics clear.
- Turn the power back on and, if necessary, press the reset button once to see if normal operation resumes.
Related codes
F34 Your boiler has detected that the electrical supply voltage coming from your home's mains is too low to run it safely.
Your boiler has detected that the electrical supply voltage coming from your home's mains is too low to run it safely.
Parts commonly replaced
- Main PCB
- Internal wiring fuse
Related codes
F37 Your boiler has stopped working because the water pressure inside the system has dropped too low.
Your boiler has stopped working because the water pressure inside the system has dropped too low.
What to check first
- Locate the filling loop valves beneath your boiler.
- Open the valves gently to let water in, watching the pressure gauge on the front of the boiler.
- Stop filling when the needle reaches between 1.0 and 1.5 bar, then firmly close the valves.
Parts commonly replaced
- Pressure Relief Valve
- Pressure Sensor
- Expansion Vessel
Related codes
Showing 21–28 of 28
F39 Your boiler is having trouble communicating with the optional sensor that measures the temperature outside your home.
Your boiler is having trouble communicating with the optional sensor that measures the temperature outside your home.
Parts commonly replaced
- Outdoor temperature sensor
- Wiring connection
F40 Your boiler has temporarily stopped working because the water pressure inside the system has risen higher than it should be.
Your boiler has temporarily stopped working because the water pressure inside the system has risen higher than it should be.
What to check first
- Locate the filling loop valves beneath your boiler and ensure they are fully closed.
- Bleed one or two of your radiators slightly using a radiator key to release excess water and pressure.
- Check the boiler pressure gauge until it drops back down into the normal green zone (usually between 1 and 1.5 bar).
Parts commonly replaced
- Pressure relief valve
- Expansion vessel
- Pressure sensor
Related codes
F47 Your boiler has temporarily stopped working because it cannot accurately read the water pressure inside the system.
Your boiler has temporarily stopped working because it cannot accurately read the water pressure inside the system.
Parts commonly replaced
- Water Pressure Sensor
- Pressure Sensor Wiring Harness
Related codes
F50 Your boiler is having trouble reading the temperature of your hot water cylinder, which means it may not be heating your water properly.
Your boiler is having trouble reading the temperature of your hot water cylinder, which means it may not be heating your water properly.
Parts commonly replaced
- NTC Sensor
- Wiring Harness
Related codes
F51 Your boiler has detected an issue with the external temperature sensor used for a solar heating system, meaning it cannot accurately read the solar panel temperature.
Your boiler has detected an issue with the external temperature sensor used for a solar heating system, meaning it cannot accurately read the solar panel temperature.
Parts commonly replaced
- PT1000 Solar Sensor
- Sensor Wiring Harness
Related codes
F52 Your boiler has detected an issue with the sensor that measures the temperature of your hot water, meaning you may currently have no hot water.
Your boiler has detected an issue with the sensor that measures the temperature of your hot water, meaning you may currently have no hot water.
Parts commonly replaced
- DHW Temperature Sensor
- Wiring Harness
Related codes
F53 Your boiler has temporarily stopped working because it has detected an issue with the sensor that monitors the temperature of the exhaust gases.
Your boiler has temporarily stopped working because it has detected an issue with the sensor that monitors the temperature of the exhaust gases.
Parts commonly replaced
- Flue gas temperature sensor
- Wiring harness
Related codes
F81 Your boiler has paused because its internal temperature sensors are reading different measurements, which is a safety check to prevent overheating.
Your boiler has paused because its internal temperature sensors are reading different measurements, which is a safety check to prevent overheating.
Parts commonly replaced
- NTC Temperature Sensor
- Flow and Return Thermistors
Related codes
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