Vokera Eclipse Fault codes & diagnostics

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

Combi Natural Gas Discontinued
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2 Emergency 72 High 1 Medium

All 75 documented codes

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00

Your boiler has detected a flame inside when it should be turned off, which is a safety mechanism preventing it from firing up again.

Emergency Engineer only £120-250

Parts commonly replaced

  • Gas valve
  • Printed Circuit Board (PCB)
  • Flame sensing electrode

Related codes

01

Your boiler has detected an electrical fault in its control system, which means it has safely shut itself down to prevent damage to its internal components.

High Engineer only £150-300

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring harness

Related codes

1 01

Your boiler has detected an electrical fault within its control system, preventing it from operating safely.

High Engineer only £150-300

Parts commonly replaced

  • Main printed circuit board (PCB)
  • Wiring harness
  • Internal fuse
02

Your boiler is attempting to start but cannot detect the flames necessary to heat your water or radiators.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Flame rectification probe

Related codes

03

Your boiler's main control computer is experiencing an internal error and cannot safely operate the system.

High Engineer only £250-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)

Related codes

04

Your boiler has detected a serious internal operating fault and has shut itself down completely for safety reasons.

High Engineer only £150-300

Parts commonly replaced

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

Related codes

4 03

Your boiler's internal computer is experiencing a critical error and can no longer control the system, meaning your heating and hot water will not work.

High Engineer only £250-450

Parts commonly replaced

  • Main Control PCB

Related codes

4 04

Your boiler's internal computer is experiencing a critical error and can no longer control the system, meaning your heating and hot water will not work.

High Engineer only £300-500

Parts commonly replaced

  • Main Control PCB

Related codes

4 05

Your boiler's internal computer is experiencing a critical error, which is preventing it from starting or running reliably.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

4 06

Your boiler’s main computer is experiencing an error, which means the system has stopped working to prevent further damage.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

Showing 11–20 of 75
4 07

Your boiler's main control computer is experiencing an internal error and cannot operate safely, meaning you currently have no heating or hot water.

High Engineer only £250-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)

Related codes

4 08

Your boiler has detected an internal computer error which prevents it from operating safely.

High Engineer only £250-450

Parts commonly replaced

  • Main Control PCB
  • Wiring harness

Related codes

4 09

Your boiler's internal computer is experiencing a critical error, which is preventing it from operating correctly.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

4 12

Your boiler's main control computer is experiencing an internal error and cannot safely operate the heating or hot water system.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

4 13

Your boiler's internal computer is experiencing a control error and cannot safely operate the heating or hot water system.

High Engineer only £250-450

Parts commonly replaced

  • Main PCB

Related codes

4 14

Your boiler's main control computer is experiencing an internal error, preventing it from operating safely or correctly.

High Engineer only £250-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
4 15

Your boiler’s main computer has encountered a serious internal error and cannot safely operate your heating or hot water.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

4 16

Your boiler's main control unit has identified a serious internal electronic error and cannot safely operate your heating or hot water.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

4 17

Your boiler has detected an internal electronic error within its main control system that is preventing it from operating correctly.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

4 24

Your boiler is confused because two temperature sensors have been accidentally swapped or are reading data in the wrong order.

High Engineer only £120-220

Parts commonly replaced

  • Flow sensor
  • Return sensor
  • Wiring harness

Related codes

Showing 21–30 of 75
4 26

Your boiler has detected an issue with its internal computer brain, meaning it has safely shut down to prevent incorrect operation.

High Engineer only £250-400

Parts commonly replaced

  • Main Control PCB
  • Wiring harness

Related codes

4 30

Your boiler has detected that the water leaving the unit is significantly hotter than the water returning, meaning your heating system is currently struggling to circulate heat effectively.

High Engineer only £120-250

Parts commonly replaced

  • Central heating pump
  • System filter
  • Diverter valve
4 31

Your boiler has detected an electrical fault in the sensor that monitors the water flow, preventing it from heating your home or providing hot water.

High Engineer only £150-250

Parts commonly replaced

  • Flow sensor
  • Wiring harness
  • PCB

Related codes

4 32

Your boiler has detected a faulty electrical signal from the sensor that monitors the temperature of the water returning to the unit, causing it to shut down for safety.

High Engineer only £120-200

Parts commonly replaced

  • Return NTC sensor
  • Wiring harness

Related codes

4 33

Your boiler's main internal computer has encountered a serious error and needs professional attention to restore function.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

05

Your boiler's internal computer has encountered an error it cannot recover from, meaning the boiler has stopped working to protect itself.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

5 28

Your boiler has stopped working because it cannot detect that the internal fan is spinning, which is a safety requirement for combustion.

High Engineer only £180-350

Parts commonly replaced

  • Fan assembly
  • Printed Circuit Board (PCB)
  • Wiring harness

Related codes

5 29

Your boiler has stopped working because it cannot detect that the internal air circulation fan is running, which is a safety requirement for it to ignite.

High Engineer only £180-350

Parts commonly replaced

  • Flue fan
  • Wiring harness
  • Printed Circuit Board (PCB)

Related codes

5 61

Your boiler has detected an internal error with its main control unit, meaning it has shut down as a safety precaution and cannot operate.

High Engineer only £250-450

Parts commonly replaced

  • Main PCB (Printed Circuit Board)
5 65

Your boiler is struggling to push air through the system correctly, which is preventing it from lighting safely.

High Engineer only £150-250

Parts commonly replaced

  • Fan unit
  • Venturi
  • Printed Circuit Board (PCB)

Related codes

Showing 31–40 of 75
06

Your boiler's main control computer is experiencing an internal error and cannot operate safely.

High Engineer only £250-450

Parts commonly replaced

  • Main PCB

Related codes

07

Your boiler's electronic brain has detected a critical internal error and has shut down for safety.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

08

Your boiler has detected a failure within its main internal computer, preventing it from operating safely.

High Engineer only £250-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)

Related codes

09

Your boiler's main control computer is experiencing an internal error and cannot safely operate your heating or hot water.

High Engineer only £250-450

Parts commonly replaced

  • Main PCB

Related codes

9 12

Your boiler is unable to drain away the water it creates during normal operation because the internal drainage pipework is blocked or restricted.

High Engineer only £90-160

Parts commonly replaced

  • Condensate trap
  • Condensate hose

Related codes

9 25

Your boiler is shutting down because it detects that water is heating up far too quickly, which indicates that heat is not circulating properly through your radiators or pipes.

High Engineer only £150-350

Parts commonly replaced

  • Central heating pump
  • System filter
  • Diverter valve
10

Your boiler's main internal computer has detected a serious internal error and has shut down for safety.

High Engineer only £250-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)

Related codes

11

Your boiler's main computer control panel is failing to process instructions correctly, which has caused the system to shut down for safety reasons.

High Engineer only £250-450

Parts commonly replaced

  • Main PCB
  • Wiring harness

Related codes

12

Your boiler is unable to clear away the water it creates during normal operation because the internal drainage pipe is blocked.

High Engineer only £90-160

Parts commonly replaced

  • Condensate trap
  • Siphonic drain pipe
  • Condensate hose

Related codes

13

Your boiler's internal computer is experiencing a critical error and cannot safely operate the system.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

Showing 41–50 of 75
14

Your boiler's internal computer is experiencing a critical error and can no longer safely control the system, meaning your heating and hot water will not function.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

15

Your boiler's main control computer is experiencing an internal error and cannot safely operate the heating or hot water system.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

16

Your boiler has detected an internal electronic error within its main control brain, meaning it has safely shut down to prevent incorrect operation.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

17

Your boiler's main control computer is experiencing an internal error and cannot operate safely.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

18

Your boiler has detected that the water inside the system has become dangerously overheated and has shut itself down to prevent damage.

High Engineer only £150-250

Parts commonly replaced

  • NTC thermistor
  • Primary heat exchanger
  • Pump

Related codes

19

Your boiler has detected that the water returning to it is dangerously hot, causing it to shut down to prevent damage or overheating.

High Engineer only £150-250

Parts commonly replaced

  • Return NTC sensor
  • Primary heat exchanger
  • Pump

Related codes

24

Your boiler has detected that the water temperature sensors are reading the pipes in the wrong order, preventing it from safely heating your home.

High Engineer only £120-200

Parts commonly replaced

  • NTC Thermistor
  • Wiring harness
  • PCB

Related codes

25

Your boiler is overheating because water is not flowing through it properly, so it has shut itself down to prevent damage.

High Engineer only £150-300

Parts commonly replaced

  • Pump
  • Diverter Valve
  • Primary Heat Exchanger

Related codes

26

Your boiler's internal computer is experiencing a critical error and cannot safely operate the heating or hot water processes.

High Engineer only £250-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)

Related codes

28

Your boiler has stopped working because it cannot detect that the internal air circulation fan is running, which is a key safety requirement for operation.

High Engineer only £150-300

Parts commonly replaced

  • Fan assembly
  • Wiring harness
  • PCB (Printed Circuit Board)

Related codes

Showing 51–60 of 75
29

Your boiler has stopped working because it cannot communicate with the internal air-moving fan that is essential for safe operation.

High Engineer only £150-250

Parts commonly replaced

  • Fan unit
  • Wiring harness
  • Printed Circuit Board

Related codes

30

Your boiler has detected an abnormal temperature difference between the water leaving and returning to it, suggesting a major circulation issue like a blockage or a pump failure.

High Engineer only £150-300

Parts commonly replaced

  • Central heating pump
  • Return temperature sensor
  • System filter

Related codes

31

Your boiler's water flow sensor is reporting an internal electrical fault, which means the system cannot safely detect if water is moving through the pipes, causing it to shut down to prevent damage.

High Engineer only £150-250

Parts commonly replaced

  • Flow sensor
  • Wiring harness

Related codes

32

Your boiler has stopped working because it is unable to accurately measure the temperature of the water returning to it, causing the system to shut down for safety.

High Engineer only £120-220

Parts commonly replaced

  • Return temperature sensor
  • Wiring harness

Related codes

33

Your boiler has detected an electrical fault in a temperature sensing component, causing it to stop working to ensure your safety.

High Engineer only £120-220

Parts commonly replaced

  • NTC temperature sensor
  • Wiring harness

Related codes

36

Your boiler has lost the ability to detect the flow of water, meaning it cannot safely heat your home or provide hot water.

High Engineer only £150-250

Parts commonly replaced

  • Flow sensor
  • Wiring harness

Related codes

37

Your boiler has lost the connection to the sensor that monitors the water temperature returning to the unit, causing it to stop heating as a safety precaution.

High Engineer only £120-220

Parts commonly replaced

  • Return temperature sensor
  • Wiring harness

Related codes

38

Your boiler has lost the connection to a sensor responsible for monitoring the cold water entering the system, meaning it cannot accurately judge the temperature and has shut down as a precaution.

High Engineer only £120-220

Parts commonly replaced

  • Inlet sensor
  • Wiring harness

Related codes

41

Your boiler's main control computer is experiencing an internal error and cannot safely operate the system.

High Engineer only £250-450

Parts commonly replaced

  • Main PCB

Related codes

42

Your boiler's main control computer is experiencing an internal error and cannot safely operate the system.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

Showing 61–70 of 75
44

Your boiler's main control computer is experiencing an internal error, meaning the system has stopped working to prevent further damage.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

60

Your boiler's internal computer has encountered a critical error and can no longer safely control the heating or hot water functions.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

61

Your boiler's internal computer has encountered a serious error and is unable to operate safely, meaning you currently have no heating or hot water.

High Engineer only £250-450

Parts commonly replaced

  • Main Control PCB

Related codes

65

Your boiler is struggling to push air through its system because the internal fan is not spinning at the right speed, causing the unit to stop working for safety reasons.

High Engineer only £150-300

Parts commonly replaced

  • Flue fan assembly
  • Fan wiring harness
  • Printed Circuit Board (PCB)

Related codes

202

Your boiler is failing to ignite because it cannot detect a steady flow of gas.

High Engineer only £120-250

Parts commonly replaced

  • Gas valve
  • Ignition electrode
  • Gas supply regulator

Related codes

436

Your boiler has lost the connection to the part that monitors water movement, so it has safely shut down to prevent overheating.

High Engineer only £120-200

Parts commonly replaced

  • Flow sensor harness
  • Flow sensor assembly

Related codes

437

Your boiler has lost the signal from a temperature sensor that monitors the water returning to the system, causing the unit to stop working as a safety precaution.

High Engineer only £120-220

Parts commonly replaced

  • Return temperature sensor
  • Wiring harness

Related codes

438

Your boiler has lost the connection to the sensor that monitors your incoming cold water, meaning it cannot properly regulate the temperature of your hot water supply.

Medium Engineer only £120-200

Parts commonly replaced

  • Cold water sensor wiring harness
  • NTC sensor

Related codes

918

Your boiler is unable to move water around your heating system because the internal pump is stuck or the valves that let water flow to your radiators are shut.

High Engineer only £150-300

Parts commonly replaced

  • Central heating pump
  • Isolation valves

Related codes

E 18

Your boiler has detected that the water inside the unit is dangerously hot and has shut itself down to prevent damage or overheating.

Emergency Engineer only £150-300

Parts commonly replaced

  • NTC thermistor
  • Primary heat exchanger
  • Central heating pump
Showing 71–75 of 75
E 19

Your boiler has detected that the water returning from your radiators is dangerously hot, causing it to shut down to prevent damage.

High Engineer only £120-250

Parts commonly replaced

  • Return NTC sensor
  • Pump
  • Primary heat exchanger

Related codes

E 24

Your boiler has detected that the water is cooling down as it travels through the system instead of heating up, indicating a communication issue between the sensors or a circulation problem.

High Engineer only £150-250

Parts commonly replaced

  • NTC thermistor
  • PCB Control Board
  • Pump
E 30

Your boiler has detected that the water leaving the heater is much hotter than the water coming back, suggesting the internal pump isn't moving water through your radiators efficiently.

High Engineer only £180-350

Parts commonly replaced

  • Circulating pump
  • Flow sensor
  • Primary heat exchanger
E 65

Your boiler has detected that the internal fan is not spinning fast enough to safely remove exhaust gases, so it has shut down to prevent a safety hazard.

High Engineer only £180-350

Parts commonly replaced

  • Flue fan
  • PCB
  • Fan wiring harness
E26

Your boiler is failing to light the flame or maintain it, meaning you likely have no heating or hot water at the moment.

High Engineer only £150-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB