ECA Confeo Premix HCH Fault codes & diagnostics

38 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Regular Natural Gas 2020-present
GC Numbers 41-814-2941-814-3041-814-3141-814-3241-814-3341-814-34
Download the ECA Confeo Premix HCH manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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Severity at a glance

Each cell = one fault code. Hover to identify.
35 High 3 Medium
Versions & GC numbers

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
41-814-31 Confeo Premix P 24 HCH NG ERP YBK UK 2020–present
41-814-32 Confeo Premix P 28 HCH NG ERP YBK UK 2020–present
41-814-33 Confeo Premix P 30 HCH NG ERP YBK UK 2020–present
41-814-34 Confeo Premix P 35 HCH NG ERP YBK UK 2020–present
Just want the most common ECA Confeo Premix HCH faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 38 documented codes

Tap any card for details

E01

Your boiler has failed to light because it cannot detect a gas supply or a flame, resulting in the system shutting down for safety.

High DIY-safe £100-280

What to check first

  1. Check that your gas meter is topped up and the emergency control valve is in the 'on' position
  2. Verify if other gas appliances in your home, such as a hob, are working correctly
  3. Press and hold the 'Reset' button for 3 to 5 seconds to clear the fault

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Printed Circuit Board (PCB)

Related codes

Full explanation for E01
E02

Your boiler thinks a flame is burning even though it hasn't released any gas yet, which has caused it to shut down for safety.

High DIY-safe £120-280

What to check first

  1. Locate the 'Reset' button on the boiler control panel.
  2. Press and hold the Reset button for 3 seconds.
  3. Wait to see if the boiler restarts; if the error returns immediately, call a gas safe engineer.

Parts commonly replaced

  • Ionisation Electrode
  • Gas Valve
  • Main PCB

Related codes

Full explanation for E02
E03

Your boiler has shut down because the water inside has become too hot, which is usually caused by a blockage or restricted water flow.

High DIY-safe £100-350

What to check first

  1. Check that all radiator valves are fully open.
  2. Ensure the boiler's service valves (underneath) are in the open position.
  3. Press the 'Reset' button on the control panel to restart the system.

Parts commonly replaced

  • Circulation Pump
  • Overheat Thermostat
  • NTC Temperature Sensor

Related codes

Full explanation for E03
E15

Your boiler has shut itself down because it is receiving conflicting readings from its internal temperature sensors.

High DIY-safe £90-180

What to check first

  1. Press and hold the 'Reset' button for 3 seconds to clear the lockout
  2. Check if your radiators are bled and the system pressure is between 1.0 and 1.5 bar
  3. If the code returns immediately after resetting, you must call a Gas Safe engineer

Parts commonly replaced

  • NTC Temperature Sensor
  • Flow/Return Thermistor
  • Control Board (PCB)

Related codes

Full explanation for E15
E16

Your boiler has switched itself off because it cannot detect a temperature reading from the main pipe that sends hot water to your radiators.

High Engineer only £90-160

Parts commonly replaced

  • Supply water temperature sensor (NTC thermistor)
  • Sensor wiring harness

Related codes

Full explanation for E16
E17

Your boiler has stopped working because it cannot detect any temperature readings from the pipe that brings water back into the unit.

High Engineer only £90-180

What to check first

  1. Press the Reset button once to see if the error clears
  2. Check that any valves on the return pipe are fully open
  3. If the code returns immediately, contact a qualified engineer

Parts commonly replaced

  • Return temperature sensor (NTC thermistor)
  • Wiring harness / sensor connections

Related codes

Full explanation for E17
E18

Your boiler has detected an unusually rapid rise in temperature and has shut down as a safety precaution to prevent overheating.

High DIY-safe £120-250

What to check first

  1. Press the Reset button on the control panel once
  2. Check that all radiator valves are fully open to allow water to circulate
  3. Ensure your system pressure is topped up to between 1.0 and 1.5 bar

Parts commonly replaced

  • Temperature Sensor (NTC thermistor)
  • Circulation Pump
  • Heat Exchanger (cleaning or replacement)

Related codes

Full explanation for E18
E33

Your boiler has detected a problem with the sensor that monitors the water temperature returning to the unit, causing it to shut down for safety.

High Engineer only £90-160

What to check first

  1. Press the Reset button once to see if the error clears
  2. Ensure all radiator valves are open to allow water flow
  3. Check if the boiler pressure is within the green zone (1.0 to 1.5 bar)

Parts commonly replaced

  • Return temperature sensor (NTC thermistor)
  • Wiring harness / connector

Related codes

Full explanation for E33
E35

Your boiler has detected a problem with the sensor that monitors the temperature of the water leaving the unit, causing it to shut down for safety.

High Engineer only £90-160

What to check first

  1. Press the Reset button once to see if the error clears
  2. Check that the boiler pressure is between 1 and 1.5 bar
  3. If the code returns immediately, contact a Gas Safe registered engineer

Parts commonly replaced

  • Flow Temperature Sensor (NTC thermistor)
  • Wiring harness/connector

Related codes

Full explanation for E35
E38

Your boiler has detected that the water pressure has dropped too soon after someone last topped it up, which usually points to a leak in your pipes or the unit itself.

High Engineer only £120-350

Parts commonly replaced

  • Pressure sensor
  • Automatic air vent
  • Expansion vessel
  • Safety relief valve

Related codes

Full explanation for E38
Showing 11–20 of 38
E44

Your boiler has stopped working because the internal gas control valve is not communicating correctly with the main system.

High Engineer only £180-350

What to check first

  1. Locate the 'R' or Reset button on the control panel
  2. Press and hold the Reset button for 3 seconds
  3. Wait for the boiler to restart; if the code E44 reappears, you must call a Gas Safe engineer

Parts commonly replaced

  • Gas Valve
  • Printed Circuit Board (PCB)
  • Wiring harness

Related codes

Full explanation for E44
E64

Your boiler has detected an internal computer error that has caused it to stop working for safety reasons.

High DIY-safe £250-450

What to check first

  1. Locate the power switch or fused spur for the boiler.
  2. Turn the power off, wait for 30 seconds, and turn it back on.
  3. If the code returns immediately, do not attempt further DIY and call a technician.

Parts commonly replaced

  • Main Printed Circuit Board (PCB)

Related codes

Full explanation for E64
E65

Your boiler has encountered an internal electronic error and has locked itself down for safety.

High DIY-safe £280-550

What to check first

  1. Locate the main power switch for your boiler.
  2. Turn the power off, wait for 30 seconds, and turn it back on.
  3. If the code persists, you must call a Gas Safe registered engineer.

Parts commonly replaced

  • Main PCB (Printed Circuit Board)
  • Wiring Loom

Related codes

Full explanation for E65
E80

Your boiler has detected that the water coming back from your radiators is hotter than the water going out, which indicates a circulation problem or a sensor fault.

High Engineer only £120-280

Parts commonly replaced

  • Return temperature sensor
  • Flow temperature sensor
  • System pump

Related codes

Full explanation for E80
E82

Your boiler is struggling to keep its burner lit and has locked itself out for safety after losing the flame multiple times in an hour.

High DIY-safe £100-280

What to check first

  1. Check that you have a credit on your gas meter or that other gas appliances like a hob are working.
  2. Press the Reset button once to see if the boiler restarts.
  3. Ensure the white plastic condensate pipe leading outside isn't frozen if it is very cold weather.

Parts commonly replaced

  • Flame sensing electrode
  • Gas valve
  • Ignition lead

Related codes

Full explanation for E82
E83

Your boiler has shut down because the exhaust gases are getting too hot, indicating a potential blockage or buildup in the main heat exchanger.

High Engineer only £250-£650

What to check first

  1. Press the Reset button once to see if the boiler restarts
  2. Check that your radiators are turned on and the system pressure is between 1.0 and 1.5 bar
  3. If the code returns, do not attempt further resets and call a Gas Safe engineer

Parts commonly replaced

  • Main Heat Exchanger
  • Flue Gas Temperature Sensor
  • Flue Collector

Related codes

Full explanation for E83
E98

Your boiler has experienced an internal electronic failure that has caused it to shut down as a safety precaution.

High Engineer only £280-450

What to check first

  1. Switch the boiler off at the main power switch
  2. Wait for 30 seconds
  3. Switch the power back on and see if the error clears

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Electronic Control Unit

Related codes

Full explanation for E98
E99

Your boiler has encountered a computer or electronic hardware error and has shut itself down to prevent damage.

High DIY-safe £180-350

What to check first

  1. Locate the power switch or fused spur for the boiler.
  2. Switch the power off and wait for 60 seconds.
  3. Switch the power back on and see if the boiler restarts normally.

Parts commonly replaced

  • Main Control Board (PCB)
  • Wiring harness connectors

Related codes

Full explanation for E99
F05

Your boiler has stopped working because the internal fan, which safely exhausts fumes, isn't responding or spinning correctly.

High Engineer only £180-350

What to check first

  1. Press the Reset button once to see if the fault clears.
  2. Ensure there are no obvious blockages at the external flue terminal outside your home.
  3. If the error returns immediately, turn off the power and call a Gas Safe engineer.

Parts commonly replaced

  • Fan assembly
  • Wiring harness
  • Main PCB

Related codes

Full explanation for F05
F07

Your boiler has shut down because the exhaust fumes have become too hot, which is a safety measure to prevent internal damage.

High Engineer only £120-£350

Parts commonly replaced

  • Flue Gas NTC Sensor
  • Main Heat Exchanger
  • Gas Valve (Calibration)

Related codes

Full explanation for F07
Showing 21–30 of 38
F10

Your boiler has stopped working because water is not flowing through the system correctly, likely due to a blockage or a pump issue.

High DIY-safe £120-350

What to check first

  1. Check that the boiler pressure is between 1.0 and 1.5 bar
  2. Ensure all radiator valves are fully open
  3. Check if the main isolation valves under the boiler are open

Parts commonly replaced

  • Circulation pump
  • Central heating filter
  • Main heat exchanger

Related codes

Full explanation for F10
F13

Your boiler has locked itself because the reset button was pressed too many times in a short period, which is a safety feature to prevent further damage.

High Engineer only £80-250

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Ignition Electrode
  • Flame Sensor

Related codes

Full explanation for F13
F34

Your boiler has stopped working because the electrical power coming from your mains supply has dropped too low for it to run safely.

High Engineer only £100-350

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Voltage Regulator/Transformer

Related codes

Full explanation for F34
F36

Your boiler has detected an issue with the electrical power supply frequency coming into your home, causing it to shut down for safety.

High Engineer only £100-280

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Surge Protector

Related codes

Full explanation for F36
F37

Your boiler has switched itself off because the water pressure is too low for it to run safely.

High DIY-safe £0-160

What to check first

  1. Locate the filling loop (usually a flexible silver hose) underneath or near the boiler.
  2. Slowly open the valves until you hear water flowing and the pressure gauge rises.
  3. Close both valves tightly when the pressure reaches between 1.5 and 2.0 bar.

Parts commonly replaced

  • Water pressure sensor
  • Filling loop valve
  • Expansion vessel

Related codes

Full explanation for F37
F39

Your boiler has lost connection with its outdoor thermometer, which helps it decide how hard to work based on the weather.

Medium DIY-safe £90-160

What to check first

  1. Locate the Reset button on your boiler control panel
  2. Press and hold the Reset button for 3 to 5 seconds
  3. Wait for the boiler to restart; if the code returns, contact a professional to check the sensor wiring

Parts commonly replaced

  • Outdoor temperature sensor (NTC)
  • External sensor wiring

Related codes

Full explanation for F39
F40

Your boiler has shut down because the internal water pressure has risen too high, likely due to overfilling or a valve being left open.

High DIY-safe £80-160

What to check first

  1. Check that the filling loop valves under the boiler are fully closed.
  2. Bleed water from a radiator using a bleed key to lower the system pressure.
  3. Monitor the pressure gauge until it returns to between 1.0 and 1.5 bar.
  4. Restart the boiler using the reset button.

Parts commonly replaced

  • Filling loop valve
  • Pressure sensor
  • Expansion vessel

Related codes

Full explanation for F40
F41

Your boiler is continuously trying to fill itself with water automatically, which usually indicates the system cannot reach its required pressure or there is a sensor error.

High Engineer only £120-250

Parts commonly replaced

  • Automatic filling valve
  • Water pressure sensor
  • Control PCB

Related codes

Full explanation for F41
F42

Your boiler is unable to automatically refill itself with water, which could be due to low pressure in your home's water pipes or a faulty internal valve.

High DIY-safe £120-220

What to check first

  1. Check that your main property water stopcock is fully open
  2. Ensure there are no local water supply interruptions in your area
  3. Try to manually reset the boiler by pressing the 'Reset' button to see if it triggers a re-fill

Parts commonly replaced

  • Automatic filling valve
  • Water pressure sensor
  • Flow limiter

Related codes

Full explanation for F42
F43

Your boiler has tried to top up its internal water levels automatically but failed, meaning there isn't enough pressure to operate safely.

High DIY-safe £120-250

What to check first

  1. Check that your main water supply stopcock is fully open.
  2. Inspect the boiler area for any visible water leaks.
  3. Attempt to manually top up the pressure using the filling loop if the automatic valve has failed.
  4. Restart the boiler to see if the error clears once pressure is restored.

Parts commonly replaced

  • Automatic water filling valve
  • Water pressure sensor
  • Filling loop assembly

Related codes

Full explanation for F43
Showing 31–38 of 38
F47

Your boiler has stopped working because it cannot detect the water pressure sensor, meaning it won't run until it knows there is enough water in the system.

High DIY-safe £90-180

What to check first

  1. Press the 'Reset' button on the boiler control panel
  2. Check the digital or manual pressure gauge to ensure water level is between 1.0 and 1.5 bar
  3. If pressure is low, top up the system using the filling loop
  4. If the code returns immediately despite good pressure, call a gas safe engineer

Parts commonly replaced

  • Water Pressure Sensor
  • Wiring harness
  • Main PCB

Related codes

Full explanation for F47
F49

Your boiler is having trouble communicating with your room thermostat, which means it isn't receiving the signal to turn your heating on or off.

High DIY-safe £100-250

What to check first

  1. Switch the boiler power off and then back on again
  2. Press the 'Reset' button on the boiler control panel
  3. Check if your wireless thermostat needs new batteries

Parts commonly replaced

  • Room Thermostat
  • Receiver Unit
  • Control PCB

Related codes

Full explanation for F49
F50

Your boiler has lost communication with the temperature sensor in your hot water storage tank, meaning it cannot monitor or heat your water correctly.

High Engineer only £90-160

Parts commonly replaced

  • NTC Storage Tank Sensor
  • Wiring harness / Connector

Related codes

Full explanation for F50
F51

Your boiler has detected a problem with the sensor connected to your solar heating system, which is causing the unit to stop operating as a precaution.

Medium Engineer only £120-220

What to check first

  1. Press the Reset button once to see if the error clears
  2. Check that the solar system pump is running if applicable
  3. Contact a qualified engineer if the code reappears immediately

Parts commonly replaced

  • PT1000 Solar Temperature Sensor
  • Sensor wiring harness

Related codes

Full explanation for F51
F52

Your boiler has detected a problem with the sensor that monitors your hot water temperature, which means you may not have consistent hot water.

Medium Engineer only £90-160

Parts commonly replaced

  • Domestic Hot Water (DHW) NTC Sensor
  • Sensor wiring harness

Related codes

Full explanation for F52
F53

Your boiler has detected a fault with the sensor that monitors the temperature of the exhaust fumes, causing it to stop running as a safety precaution.

High Engineer only £110-190

Parts commonly replaced

  • Flue Gas Temperature Sensor (NTC)
  • Wiring Harness Connections

Related codes

Full explanation for F53
F81

Your boiler has paused itself because the internal temperature sensors are giving conflicting readings and cannot accurately tell how hot the water is.

High Engineer only £90-180

Parts commonly replaced

  • NTC Temperature Sensor
  • Wiring Harness

Related codes

Full explanation for F81
F201

Your boiler's internal computer parts are having trouble talking to each other, which means the control panel cannot tell the boiler to turn on.

High Engineer only £180-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • MMI Control Interface
  • Communication Ribbon Cable

Related codes

Full explanation for F201
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