Vokera Pinnacle Fault codes & diagnostics

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

System Natural GasLPG 30-40 kW 2005-2010 Discontinued
GC Number 41-311-73

Replaced by: Mynute i

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53 High 1 Low
Just want the most common Vokera Pinnacle faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 54 documented codes

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b/E 18

Your boiler is unable to move water around the system, which is likely caused by a stuck internal pump or a closed valve blocking the flow.

High DIY-safe £180-350

What to check first

  1. Check that the service valves underneath the boiler (usually handle-style taps) are fully open and parallel to the pipework.
  2. Ensure all radiator valves are turned to their highest setting to allow water to flow.
  3. Try resetting the boiler to see if the pump clears its own blockage.

Parts commonly replaced

  • Circulating Pump
  • Pump Capacitor
  • Flow/Return Valves

Related codes

Full explanation for b/E 18
b18

Your boiler has reached an excessively high temperature and has shut down as a safety precaution to prevent overheating.

High DIY-safe £120-£350

What to check first

  1. Check that your radiator valves are open to allow water to circulate
  2. Check that the system pressure is between 1.0 and 1.5 bar on the gauge
  3. Turn the boiler off and wait 30 minutes for it to cool down before resetting

Parts commonly replaced

  • Circulation Pump
  • Flow Temperature Sensor (NTC)
  • Main Heat Exchanger

Related codes

Full explanation for b18
b19

Your boiler has detected that the water returning to the unit is much too hot, suggesting it isn't circulating properly through your radiators or pipes.

High DIY-safe £100-280

What to check first

  1. Check that all radiator valves are fully open
  2. Ensure the boiler pressure is between 1.0 and 1.5 bar
  3. Check if any bypass valves are closed or if there is a blockage in the system

Parts commonly replaced

  • Circulation pump
  • Return thermistor (NTC sensor)
  • Main heat exchanger (if blocked)

Related codes

Full explanation for b19
b24

Your boiler has detected that the water temperatures are the wrong way around, usually because the water is not flowing through the pipes correctly.

High Engineer only £120-350

Parts commonly replaced

  • Circulation Pump
  • Flow NTC Sensor
  • Return NTC Sensor

Related codes

Full explanation for b24
b25

Your boiler has detected that the water is heating up too quickly, which usually means it can't circulate water through the system properly.

High DIY-safe £120-£350

What to check first

  1. Check that your radiator valves are open and not turned to zero.
  2. Ensure your boiler pressure is between 1 and 1.5 bar on the gauge.
  3. Try resetting the boiler to see if the fault clears.

Parts commonly replaced

  • Circulation pump
  • Main heat exchanger
  • NTC temperature sensor

Related codes

Full explanation for b25
b26

Your boiler has stopped working because the waste water pipe or trap is full and cannot drain away properly.

High DIY-safe £80-140

What to check first

  1. Locate the white plastic condensate pipe leading away from the boiler.
  2. If the pipe runs outside, check if the end is frozen and pour warm (not boiling) water over it to melt any ice.
  3. Check for any obvious kinks or blockages in the visible sections of the plastic drainage pipe.

Parts commonly replaced

  • Condensate trap assembly
  • Condensate discharge pipework
  • Float switch
Full explanation for b26
b28

Your boiler has stopped working because the internal fan, which safely clears waste gases, is not spinning or communicating with the main control board.

High Engineer only £180-£350

Parts commonly replaced

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

Related codes

Full explanation for b28
b29

Your boiler has stopped working because the fan used to clear out waste gases is not communicating correctly with the main control board.

High Engineer only £180-450

Parts commonly replaced

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

Related codes

Full explanation for b29
b30

Your boiler has detected that water is heating up too quickly or not circulating properly through the system, causing it to shut down for safety.

High DIY-safe £120-£350

What to check first

  1. Check that all radiator valves are fully open
  2. Ensure your boiler pressure is between 1.0 and 1.5 bar
  3. Bleed all radiators to remove trapped air pockets

Parts commonly replaced

  • Circulation pump
  • Heat exchanger
  • Temperature thermistors (NTC sensors)

Related codes

Full explanation for b30
b65

Your boiler's fan is not spinning fast enough to clear the pipes, which prevents the system from safely lighting the gas to provide heating or hot water.

High Engineer only £180-350

Parts commonly replaced

  • Fan assembly
  • Printed Circuit Board (PCB)
  • Air pressure switch

Related codes

Full explanation for b65
Showing 11–20 of 54
E00

Your boiler thinks it sees a flame even though it isn't currently firing, which is a safety conflict that prevents it from starting up.

High Engineer only £120-£350

Parts commonly replaced

  • Ionisation electrode
  • Printed Circuit Board (PCB)
  • Gas Valve

Related codes

Full explanation for E00
E01

Your boiler has tried to light but failed to start, which means you currently have no heating or hot water.

High DIY-safe £120-350

What to check first

  1. Check that your gas supply is turned on at the meter
  2. If you have a prepaid meter, ensure you have credit available
  3. Press the Reset button on the control panel to see if the boiler restarts

Parts commonly replaced

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

Related codes

Full explanation for E01
E02

Your boiler is failing to light the gas, which means your heating and hot water will not work until the system is reset or repaired.

High DIY-safe £100-£350

What to check first

  1. Check if other gas appliances, like a hob, are working to ensure gas is being supplied to the property.
  2. Ensure your gas meter has credit if you use a prepay meter.
  3. Press the 'Reset' button on the boiler control panel once to see if the system restarts.

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Spark generator
  • Ionisation probe

Related codes

Full explanation for E02
E03

Your boiler's internal computer has developed a fault and can no longer talk to the rest of the system.

High Engineer only £250-£450

Parts commonly replaced

  • Main PCB (Control Board)
  • Wiring Harness

Related codes

Full explanation for E03
E04

Your boiler has shut down completely because its internal computer has lost power or suffered a serious electrical fault.

High DIY-safe £100-£350

What to check first

  1. Check if your home has had a power cut or if a fuse has tripped in your consumer unit
  2. Ensure the boiler's fused spur switch (usually nearby) is turned on
  3. Press the Reset button or turn the control knob to 'OFF/RESET' for 10 seconds, then back to the heater icon

Parts commonly replaced

  • Main PCB (Printed Circuit Board)
  • Wiring harness
  • Fuse

Related codes

Full explanation for E04
E05

Your boiler's main internal computer has developed a malfunction and can no longer control the heating system safely.

High Engineer only £280-550

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Wiring Harness

Related codes

Full explanation for E05
E06

Your boiler's internal computer has encountered a critical error and needs a professional to inspect or replace it.

High Engineer only £250-450

Parts commonly replaced

  • Main PCB (Printed Circuit Board)

Related codes

Full explanation for E06
E07

Your boiler's main control board has encountered an internal electronic error, meaning the 'brain' of the system is unable to function correctly.

High Engineer only £250-£450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)

Related codes

Full explanation for E07
E08

Your boiler's internal temperature sensors have developed a fault, meaning the system cannot safely monitor the water temperature and has shut down as a precaution.

High Engineer only £90-160

Parts commonly replaced

  • NTC Temperature Sensor
  • Wiring Harness
  • Main PCB

Related codes

Full explanation for E08
E09

Your boiler's computer control board has developed a serious electronic fault and can no longer manage the system safely.

High Engineer only £250-£450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • PCB Wiring Harness

Related codes

Full explanation for E09
Showing 21–30 of 54
E10

Your boiler has detected that waste water cannot drain away properly, which is causing it to shut down to prevent internal water damage.

High DIY-safe £90-180

What to check first

  1. Locate the white plastic condensate pipe emerging from the bottom of the boiler or going through your external wall.
  2. Check the end of the pipe outside for any blockages like ice, dirt, or debris.
  3. If the pipe is frozen, pour warm (not boiling) water over the external section to melt the ice before resetting the boiler.

Parts commonly replaced

  • Condensate trap
  • Pressure switch
Full explanation for E10
E11

Your boiler's main control board has encountered an internal electronic error and can no longer manage the system safely.

High Engineer only £250-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Wiring Harness

Related codes

Full explanation for E11
E12

Your boiler has become too hot and has shut itself down for safety to prevent damage.

High DIY-safe £100-280

What to check first

  1. Check that all radiator valves are fully open
  2. Ensure the system pressure is between 1 and 1.5 bar
  3. Press the 'Reset' button on the control panel
  4. Wait 20 minutes for the unit to cool down before trying to restart

Parts commonly replaced

  • Circulation pump
  • Overheat thermostat
  • Main heat exchanger (de-scale)

Related codes

Full explanation for E12
E13

Your boiler's main control board has suffered an internal electronic failure and can no longer manage the system's functions.

High Engineer only £250-450

Parts commonly replaced

  • Main PCB (Printed Circuit Board)
  • Wiring harness

Related codes

Full explanation for E13
E14

Your boiler's electronic control board has experienced an internal failure, meaning the main computer cannot communicate with the rest of the system.

High Engineer only £280-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Wiring Harness

Related codes

Full explanation for E14
E15

Your boiler's main internal computer has developed a fault and is no longer able to control the heating process safely.

High Engineer only £280-550

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Wiring Harness

Related codes

Full explanation for E15
E16

Your boiler's main control board has encountered a software or electrical error and is unable to operate the system safely.

High Engineer only £250-£450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Wiring Harness

Related codes

Full explanation for E16
E17

Your boiler’s main control centre has suffered an internal electronic failure and requires professional repair.

High Engineer only £250-£450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

Full explanation for E17
E18

Your boiler has sensed that the water inside is Getting too hot and has shut down to prevent damage.

High DIY-safe £90-250

What to check first

  1. Check all radiator valves are fully open to allow water flow
  2. Ensure the boiler pressure gauge is between 1.0 and 1.5 bar
  3. Restart the boiler using the reset dial or button

Parts commonly replaced

  • Circulation Pump
  • Flow Temperature Sensor (NTC thermistor)
  • Main Heat Exchanger cleaning

Related codes

Full explanation for E18
E19

Your boiler has detected that the water returning from your radiators is getting too hot, indicating a possible circulation or sensor issue.

High DIY-safe £100-220

What to check first

  1. Check that all radiator valves (TRVs) are fully open
  2. Ensure the boiler pressure is between 1.0 and 1.5 bar
  3. Restart the boiler using the reset dial

Parts commonly replaced

  • Return NTC Thermistor (Sensor)
  • Circulation Pump

Related codes

Full explanation for E19
Showing 31–40 of 54
E25

Your boiler is overheating because water isn't moving through the system quickly enough to carry the heat away.

High DIY-safe £150-350

What to check first

  1. Check that at least two or three radiators have their valves turned fully open
  2. Ensure the external heating pump (if visible) is running
  3. Reset the boiler once the system has cooled down

Parts commonly replaced

  • Circulation pump
  • Temperature thermistor (NTC sensor)
  • Main heat exchanger (flushing debris)

Related codes

Full explanation for E25
E28

Your boiler has stopped working because the internal fan, which safely clears away exhaust gases, is not communicating with the main control board.

High Engineer only £220-£450

Parts commonly replaced

  • Fan assembly
  • Main PCB
  • Wiring harness

Related codes

Full explanation for E28
E29

Your boiler has stopped working because the internal fan is not spinning at the correct speed or the system cannot communicate with it.

High Engineer only £180-£350

Parts commonly replaced

  • Fan assembly
  • Fan wiring loom
  • Printed Circuit Board (PCB)
Full explanation for E29
E30

Your boiler has sensed that the water is heating up too quickly or unevenly, causing it to shut down for safety.

High DIY-safe £100-£350

What to check first

  1. Check that your system water pressure is between 1 and 1.5 bar on the pressure gauge.
  2. Ensure all radiator valves and the boiler service valves are fully open.
  3. Gently bleed your radiators to remove any trapped air that might be blocking circulation.
  4. Press the reset button to see if the boiler restarts once it has cooled down.

Parts commonly replaced

  • Circulation Pump
  • Thermistor (NTC Sensor)
  • Main Heat Exchanger (if blocked with sludge)
Full explanation for E30
E31

Your boiler has detected an electrical fault with the internal sensor that monitors the temperature of the water leaving the unit, preventing it from heating up safely.

High Engineer only £90-180

Parts commonly replaced

  • Flow thermistor (NTC sensor)
  • Wiring harness connecting to the sensor

Related codes

Full explanation for E31
E32

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

High Engineer only £100-£190

Parts commonly replaced

  • Return NTC thermistor
  • Wiring harness

Related codes

Full explanation for E32
E33

Your boiler's internal computer has detected a communication error or a hardware failure within its own electronic control system.

High Engineer only £250-£450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Wiring Harness

Related codes

Full explanation for E33
E36

Your boiler has lost communication with a sensor that monitors water temperature, meaning it cannot operate safely and has shut down.

High Engineer only £100-180

Parts commonly replaced

  • Flow NTC thermistor
  • Wiring harness
  • Main circuit board (PCB)

Related codes

Full explanation for E36
E37

Your boiler has identified a communication problem with the sensor that monitors water returning from your radiators, preventing the system from operating correctly.

High Engineer only £90-160

Parts commonly replaced

  • Return thermistor (NTC sensor)
  • Sensor wiring harness

Related codes

Full explanation for E37
E38

Your boiler has experienced an internal communication error or hardware failure within its control system, causing it to shut down for safety.

High Engineer only £280-550

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Wiring harness

Related codes

Full explanation for E38
Showing 41–50 of 54
E44

Your boiler’s main computer brain has developed an internal electrical error and can no longer control the heating system safely.

High Engineer only £250-£450

Parts commonly replaced

  • Main PCB (Printed Circuit Board)
  • Wiring Harness
Full explanation for E44
E60

Your boiler's internal computer has encountered a settings error or a communication glitch between its electronic components.

High DIY-safe £100-£350

What to check first

  1. Turn the boiler power switch to the 'OFF' position.
  2. Wait for approximately 30 seconds.
  3. Switch the boiler back to 'ON' and see if the E 60 code clears.

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Display Interface
  • Wiring Loom
Full explanation for E60
E65

Your boiler is unable to blow out the waste gases properly because the fan is not spinning fast enough to stay safe.

High Engineer only £220-450

Parts commonly replaced

  • Fan motor
  • PCB (Main control board)
  • Fan wiring harness
Full explanation for E65
Fan fault

Your boiler is unable to safely move air through its system, so it has stopped working to prevent any potential risks.

High Engineer only £180-350

Parts commonly replaced

  • Fan/Flue Fan Assembly
  • Air Pressure Switch
  • Wiring Loom
Full explanation for Fan fault
Ignition fault

Your boiler is failing to light the flame needed to provide heating or hot water, meaning it has currently shut itself down to remain safe.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Printed Circuit Board (PCB)
Full explanation for Ignition fault
No display, boiler inactive

Your boiler has lost all power and is completely unresponsive, meaning it cannot provide any heating or hot water until the electrical connection is restored.

High Engineer only £120-250

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Internal Fuse
  • Power Supply Unit
Full explanation for No display, boiler inactive
No display, boiler working OK

Your boiler is continuing to provide heating and hot water as normal, but the digital screen has gone blank.

Low Engineer only £120-200

Parts commonly replaced

  • Interface display PCB
  • Display ribbon cable
Full explanation for No display, boiler working OK
No display, pump running

Your boiler has lost power to its control screen, but the internal water pump is stuck running, which suggests an electrical fault within the main control system.

High Engineer only £180-350

Parts commonly replaced

  • PCB
  • Wiring harness
  • Transformer
Full explanation for No display, pump running
Pump failure

Your boiler has detected that the water pump is not moving water through your radiators and taps properly, so it has shut down to prevent damage.

High Engineer only £200-350

Parts commonly replaced

  • Central Heating Pump
  • Pump PCB connector
  • Wiring harness
Full explanation for Pump failure
Test 1A

Your boiler has lost its display and controls, which usually means the main internal circuit board has failed while the pump is stuck in a backup safety mode.

High Engineer only £250-£450

Parts commonly replaced

  • Main PCB (Control Board)
  • Internal Fuse
  • Wiring Harness
Full explanation for Test 1A
Showing 51–54 of 54
Test1

Your boiler appears to have no power and is completely unresponsive to any commands.

High DIY-safe £100-350

What to check first

  1. Check if other appliances in the house are working to rule out a power cut
  2. Check your main consumer unit (fuse box) to see if a circuit has tripped
  3. Ensure the boiler's fused spur switch is turned on and the fuse inside has not blown

Parts commonly replaced

  • Main PCB (Printed Circuit Board)
  • Internal Glass Fuse
  • Display Interface
Full explanation for Test1
Test2

Your boiler's internal pump has stopped moving water around the system, which means your heating and hot water will not work.

High Engineer only £220-450

Parts commonly replaced

  • Circulating Pump
  • Pump Head
  • Main PCB

Related codes

Full explanation for Test2
Test3

Your boiler has identified an issue with the air fan, preventing it from safely clearing away exhaust gases and starting the ignition process.

High Engineer only £180-350

Parts commonly replaced

  • Fan assembly
  • Printed Circuit Board (PCB)
  • Air pressure switch

Related codes

Full explanation for Test3
Test4

Your boiler has failed to light the flame after several attempts, meaning it cannot provide you with any heating or hot water.

High DIY-safe £120-£350

What to check first

  1. Check that your gas prepayment meter has credit (if applicable)
  2. Check that other gas appliances in your home, like a hob, are working correctly
  3. Press the 'Reset' button on the boiler control panel to see if it clears the lockout

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Spark generator
  • Printed Circuit Board (PCB)
Full explanation for Test4