Alpha E-Tec Plus 33 Fault codes & diagnostics

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

Combi Natural Gas 33 kW 2019-present
Download the Alpha E-Tec Plus 33 manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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Each cell = one fault code. Hover to identify.
4 Emergency 49 High 3 Medium

All 56 documented codes

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01

Your boiler has failed to light the flame needed to generate heat, and it will keep trying to restart until the fault is cleared.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB

Related codes

02

Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent any damage or danger.

High Engineer only £120-250

Parts commonly replaced

  • NTC sensor
  • Pump
  • Diverter valve
  • Heat exchanger

Related codes

03

Your boiler has automatically shut down because the exhaust gases escaping through your flue pipe have become dangerously hot, suggesting a potential internal blockage or a cooling issue.

Emergency Engineer only £150-300

Parts commonly replaced

  • Flue sensor
  • Primary heat exchanger
  • Pump

Related codes

04

Your boiler has lost the secure electrical connection required to safely control its gas supply, so it has shut down to prevent any unsafe operation.

High Engineer only £150-250

Parts commonly replaced

  • Gas valve wiring harness
  • Gas valve assembly
  • Printed circuit board (PCB)

Related codes

05

Your boiler is struggling to detect the temperature of the water flowing through your heating system, which is preventing it from heating your home properly.

High Engineer only £150-250

Parts commonly replaced

  • NTC sensor
  • Wiring harness

Related codes

06

Your boiler is struggling to detect the temperature of the water being heated for your taps, which means it has stopped providing hot water to prevent overheating.

High Engineer only £120-200

Parts commonly replaced

  • DHW NTC thermistor sensor
  • Wiring harness

Related codes

08

Your boiler has attempted to restart itself too many times after encountering a series of underlying issues and has now locked itself out for safety.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB
  • Flame sensor

Related codes

10

Your boiler has stopped working because the water pressure inside the heating system has dropped too low.

High DIY-safe £0-£120

What to check first

  1. Locate the external filling loop, usually two silver valves connected by a braided metal hose underneath the boiler.
  2. Open the valves slowly to allow water into the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.
  3. Close both valves firmly and ensure they are fully tightened.

Parts commonly replaced

  • Filling loop
  • Pressure relief valve
  • Pressure gauge

Related codes

12

Your boiler's computer system is currently confused about how your internal heating setup is configured, which prevents it from operating safely.

High Engineer only £120-250

Parts commonly replaced

  • PCB (Printed Circuit Board)
15

Your boiler's computer is confused because its internal settings do not match how the system is physically connected or configured.

High Engineer only £120-250

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring harness

Related codes

Showing 11–20 of 56
16

Your boiler has stopped working because it cannot properly circulate the air it needs to burn gas safely.

High Engineer only £180-350

Parts commonly replaced

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

Related codes

20

Your boiler has detected a flame signal when it shouldn't be there, so it has purposefully shut itself down to keep your home safe.

High Engineer only £150-300

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Flame rectification probe
  • Gas valve

Related codes

23

Your boiler's computer is confused because it has detected a mismatch in its internal settings, meaning it cannot safely start your heating or hot water.

High Engineer only £120-250

Parts commonly replaced

  • Main Control PCB
  • Configuration Key

Related codes

24

Your boiler's control panel has detected that one of its buttons is permanently held down or jammed, preventing the system from operating normally.

High DIY-safe £100-200

What to check first

  1. Switch off the boiler power at the fused spur or mains switch.
  2. Carefully inspect the control panel buttons or digital interface for any dirt, debris, or sticky residue that might be holding a button in place.
  3. Gently press or wiggle the buttons to see if they can be un-stuck, then power the boiler back on to see if the code clears.

Parts commonly replaced

  • User interface (UI) board
  • Control panel assembly membrane
25

Your boiler's computer has encountered an internal error and cannot communicate properly, which means it will not be able to provide heating or hot water.

High Engineer only £200-350

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

27

Your boiler is struggling to pump water around your heating system effectively, causing it to overheat and shut down to protect itself.

High Engineer only £150-300

Parts commonly replaced

  • Central heating pump
  • System filter
  • Diverter valve

Related codes

29

Your boiler has detected an issue with the sensor that monitors the temperature of the gases leaving your flue, meaning it has safely shut down to prevent potential overheating.

High Engineer only £120-220

Parts commonly replaced

  • Flue gas sensor
  • Wiring harness
31

Your boiler has lost its connection to your smart thermostat or wall controller, meaning it does not know when to turn the heating on.

Medium Engineer only £120-250

Parts commonly replaced

  • Alpha Climatic central unit
  • PCB
  • Wiring loom
36

Your boiler's electronic control system is showing an error that doesn't apply to this specific model, suggesting a potential software glitch or a loose internal communication wire.

High Engineer only £120-250

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring harness

Related codes

37

Your boiler is struggling because it is not receiving enough electricity from your home's mains power supply.

High Engineer only £120-250

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring harness
  • External power supply/fused spur

Related codes

Showing 21–30 of 56
38

Your boiler is struggling to keep its flame lit, so it is automatically turning itself off and trying to restart to keep you safe.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Ionisation probe
  • Gas valve

Related codes

43

Your boiler is repeatedly shutting down because it cannot consistently keep the flame lit, often caused by strong winds affecting the flue outside.

High Engineer only £120-250

Parts commonly replaced

  • Flame rectification electrode
  • Ignition lead
  • Gas valve

Related codes

44

Your boiler has detected a safety concern and has automatically shut down to protect your home, preventing it from producing heating or hot water.

High Engineer only £150-300

Parts commonly replaced

  • Flow and return sensors
  • PCB
  • Wiring harness

Related codes

45

Your boiler has detected that the water is heating up or circulating much faster than it should, which often points to a blockage or a pump issue.

High Engineer only £150-300

Parts commonly replaced

  • Central heating pump
  • Plate heat exchanger
  • System filter

Related codes

46

Your boiler has stopped working because a safety link that tells the unit it is safe to operate has been disconnected or triggered.

High Engineer only £100-200

Parts commonly replaced

  • External safety link
  • External safety device

Related codes

47

Your boiler is getting too hot inside its exhaust path, so it has automatically turned down its power to prevent any internal damage.

High Engineer only £150-300

Parts commonly replaced

  • Flue gas sensor
  • Heat exchanger
  • PCB

Related codes

51

Your boiler has lost its wireless connection to your room thermostat or controller, meaning it doesn't know when to turn the heating on or off.

Medium DIY-safe £100-200

What to check first

  1. Check if the batteries in your remote thermostat controller are dead and replace them if necessary.
  2. Switch the boiler off at the fused spur for 60 seconds, then turn it back on to force a signal resync.
  3. Ensure there are no large metal objects or new electronic devices placed between the boiler and the thermostat causing interference.

Parts commonly replaced

  • Climatic RF receiver module
  • RF transmitter unit
59

Your boiler is struggling because the electricity supply coming from your mains is not stable or is fluctuating outside of the normal range it expects.

High Engineer only £120-250

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring Harness
60

Your boiler has stopped circulating water because the internal pump that pushes water around your heating system is currently not spinning.

High Engineer only £180-350

Parts commonly replaced

  • Central heating pump
  • Wiring harness
  • PCB

Related codes

61

Your boiler is struggling to push water around your heating system because there is trapped air bubbles inside the pump or a blockage in the pipes.

High DIY-safe £90-180

What to check first

  1. Check your boiler pressure gauge to ensure it is between 1.0 and 1.5 bar
  2. Bleed all radiators in your home starting from the downstairs and moving upstairs
  3. Top up the system pressure to 1.5 bar using the filling loop if it dropped after bleeding

Parts commonly replaced

  • Central heating pump
  • Automatic air vent
  • System filter

Related codes

Showing 31–40 of 56
70

Your boiler is struggling to detect water temperature correctly, which is likely caused by a blocked system, loose wiring, or a faulty sensor prevented it from heating properly.

High Engineer only £120-250

Parts commonly replaced

  • NTC Temperature Sensor
  • Wiring harness
  • System magnetic filter

Related codes

73

Your boiler has detected an inconsistent temperature reading between its internal sensors, causing it to shut down for safety.

High Engineer only £150-250

Parts commonly replaced

  • NTC Sensor
  • Wiring harness

Related codes

74

Your boiler has detected a faulty reading from a sensor that monitors the internal temperature, causing it to shut down for safety.

High Engineer only £150-250

Parts commonly replaced

  • Safety NTC sensor
  • Wiring harness
  • Main PCB

Related codes

75

Your boiler is struggling to accurately read its own internal water temperatures because its primary thermometers are likely sending conflicting or faulty signals.

High Engineer only £120-220

Parts commonly replaced

  • NTC Temperature Sensor
  • Wiring Harness

Related codes

77

Your boiler has detected an issue with the internal component that controls the gas supply, meaning it has safely shut down to prevent unsafe operation.

High Engineer only £150-300

Parts commonly replaced

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

Related codes

78

Your boiler has detected an issue with the internal component that manages the gas supply, meaning it has safely switched itself off to prevent unsafe operation.

Emergency Engineer only £150-300

Parts commonly replaced

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

Related codes

79

Your boiler has detected an issue with the internal component that regulates gas flow, meaning it has safely shut itself down to prevent unsafe operation.

High Engineer only £180-350

Parts commonly replaced

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

Related codes

80

Your boiler has detected an internal electrical fault preventing it from safely controlling the gas supply, so it has shut down to keep your home safe.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring harness

Related codes

84

Your boiler is struggling because it is not receiving enough gas to work properly, so it has automatically limited its power to stay safe.

High Engineer only £120-250

Parts commonly replaced

  • Gas valve
  • Gas meter regulator
  • Gas supply pipework

Related codes

87

Your boiler has detected an internal issue with the part that manages the gas supply, so it has safely shut itself down to prevent unsafe operation.

High Engineer only £250-450

Parts commonly replaced

  • Gas valve
  • Printed Circuit Board (PCB)
Showing 41–50 of 56
88

Your boiler has detected an internal communication error with its gas supply system and has safely shut down to prevent unsafe operation.

High Engineer only £180-350

Parts commonly replaced

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

Related codes

89

Your boiler is struggling to keep a steady flame, causing it to shut down for safety reasons.

High Engineer only £150-350

Parts commonly replaced

  • Flame rectification electrode
  • Gas valve
  • Burner seal
  • PCB

Related codes

90

Your boiler has detected an issue with the flame detection system, forcing a safety shutdown to prevent improper operation.

High Engineer only £150-300

Parts commonly replaced

  • Flame rectification electrode
  • Ignition lead
  • Printed circuit board

Related codes

91

Your boiler is failing to stay lit because it cannot reliably detect the flame needed to produce heat.

High Engineer only £150-300

Parts commonly replaced

  • Ignition electrode
  • Flame rectification probe
  • Gas valve
  • PCB

Related codes

92

Your boiler's air management system is struggling to function properly and has hit its limit, causing it to stop for safety reasons.

High Engineer only £150-300

Parts commonly replaced

  • Fan assembly
  • Air pressure switch
  • Flue system components

Related codes

93

Your boiler has detected an issue with the flame intensity that falls outside of its normal operating settings, causing it to shut down for safety reasons.

High Engineer only £120-250

Parts commonly replaced

  • Flame rectification electrode
  • Gas valve
  • PCB

Related codes

94

Your boiler has detected an issue with the air or exhaust flow, meaning it cannot safely burn gas, so it has shut down to protect your home.

Emergency Engineer only £150-350

Parts commonly replaced

  • Fan assembly
  • Flue seal
  • Air pressure switch
  • Venturi

Related codes

95

Your boiler is struggling to maintain a steady flame, causing it to shut down for safety reasons.

High Engineer only £150-350

Parts commonly replaced

  • Ignition electrode
  • Flame rectification probe
  • Gas valve
96

Your boiler has detected an obstruction in the pipe that removes exhaust gases, meaning it cannot safely vent and has shut down to prevent a carbon monoxide hazard.

Emergency Engineer only £120-250

Parts commonly replaced

  • Flue terminal
  • Fan assembly
  • Air pressure switch

Related codes

98

Your boiler's computer system has encountered too many internal errors and has safely locked itself to prevent further issues.

High Engineer only £150-300

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Control wiring harness
Showing 51–56 of 56
99

Your boiler has detected a general internal fault that is preventing it from operating safely.

High Engineer only £150-300

Parts commonly replaced

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

Related codes

CE

Your boiler is receiving an unusual temperature reading from an external sensor, preventing it from heating your home correctly.

Medium Engineer only £120-200

Parts commonly replaced

  • External weather compensation sensor
  • Wiring loom

Related codes

E03

Your boiler has detected that it is running too hot and has automatically shut down to prevent damage to its internal components.

High Engineer only £120-250

Parts commonly replaced

  • NTC temperature sensor
  • Primary heat exchanger
  • Pump

Related codes

E38

Your boiler has stopped working because it cannot stay lit, meaning your heating and hot water have turned off as a safety precaution.

High Engineer only £150-300

Parts commonly replaced

  • Ignition electrode
  • Flame rectification probe
  • Gas valve

Related codes

E62

Your boiler has lost its internal settings regarding the type of gas it uses and needs a professional to recalibrate the system before it can safely operate.

High Engineer only £100-200
E72

Your boiler has lost its fine-tuning settings and needs to recalibrate itself to burn gas correctly.

High Engineer only £120-220

Parts commonly replaced

  • Gas valve
  • PCB

4 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

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