Ideal Vogue Combi Fault codes & diagnostics

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

Combi Natural Gas 26-40 kW 2013-present
Download the Ideal Vogue Combi 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.
2 Emergency 28 High 4 Medium 2 Low
Just want the most common Ideal Vogue Combi faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 36 documented codes

Tap any card for details

4.4

Your boiler is struggling to keep a flame lit, which means the system has safely shut itself down to prevent a fault.

High DIY-safe £100-£350

What to check first

  1. Check that your gas pre-payment meter (if you have one) has credit.
  2. Verify that other gas appliances, like a hob, are working correctly to rule out a gas supply issue.
  3. Restart the boiler by pressing the 'Reset' button on the display panel.

Parts commonly replaced

  • Ignition electrode
  • Flame sensing probe
  • Gas valve
  • Condensate trap (clearing a blockage)
Full explanation for 4.4
4.5

Your boiler has overheated to a critical level and a safety component has permanently cut the power to prevent serious damage.

High Engineer only £180-350

Parts commonly replaced

  • Main Heat Exchanger
  • Thermal Fuse
  • Heat Exchanger Wiring Harness
  • Overheat Thermostat
Full explanation for 4.5
4.6

Your boiler thinks it sees a flame before it has even started the ignition process, which is a safety conflict that prevents it from running.

High Engineer only £180-450

Parts commonly replaced

  • Flame sensing electrode
  • Gas valve
  • Main PCB (Printed Circuit Board)
Full explanation for 4.6
4.7

Your boiler has detected a problem with the internal sensor that measures the temperature of the water leaving the unit, preventing it from heating correctly.

High Engineer only £90-160

Parts commonly replaced

  • Flow Thermistor (NTC Sensor)
  • Wiring Harness

Related codes

Full explanation for 4.7
4.8

Your boiler has lost communication with the sensor that monitors the outdoor temperature, meaning it might not heat your home as efficiently as usual.

Low DIY-safe £90-160

What to check first

  1. Check the outdoor sensor for any obvious physical damage or loose wires
  2. Ensure the sensor is not covered by snow, debris, or overgrown plants
  3. Reset the boiler to see if the fault clears

Parts commonly replaced

  • Outdoor weather compensation sensor
  • External sensor wiring

Related codes

Full explanation for 4.8
4.9

Your boiler has lost its ability to measure the temperature of the water coming back from your radiators, often resulting in the system shutting down for safety.

High Engineer only £120-£210

Parts commonly replaced

  • Return Thermistor (NTC Sensor)
  • Connecting Wiring Harness

Related codes

Full explanation for 4.9
4.10

Your boiler has stopped working because the fan that safely removes exhaust gases isn't running at the correct speed.

High Engineer only £280-450

Parts commonly replaced

  • Extraction Fan
  • Main PCB
  • Wiring Loom
Full explanation for 4.10
4.11

Your boiler has detected that there is not enough water in the system to operate safely, causing it to shut down to prevent damage.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop valves on the pipework underneath the boiler.
  2. Slowly open the valves until you hear water entering the system.
  3. Watch the pressure gauge and close the valves once the needle reaches between 1.0 and 1.5 bar.

Parts commonly replaced

  • Filling loop
  • Expansion vessel
  • Pressure sensor

Related codes

Full explanation for 4.11
4.12

Your boiler has stopped working because it cannot detect water moving through the system to keep it from overheating.

High DIY-safe £100-£350

What to check first

  1. Check if the pressure gauge is below 1 bar and top it up using the filling loop
  2. Ensure all radiator valves and boiler isolation valves are fully open
  3. Check for any visible leaks around your radiators or the boiler itself
  4. Restart the boiler once the pressure is correct

Parts commonly replaced

  • Circulating Pump
  • Water Pressure Sensor
  • Flow Thermistor

Related codes

Full explanation for 4.12
4.13

Your boiler's internal computer parts are failing to talk to each other, meaning the system cannot receive the instructions it needs to start up.

High Engineer only £250-£550

Parts commonly replaced

  • Main PCB
  • Wiring Harness
  • Display PCB

Related codes

Full explanation for 4.13
Showing 11–20 of 36
4.14

Your boiler is providing hot water to your taps correctly, but there is a communication or mechanical fault preventing it from heating your radiators.

Medium Engineer only £120-£350

Parts commonly replaced

  • Diverter Valve Motor
  • Diverter Valve Cartridge
  • External Programmer

Related codes

Full explanation for 4.14
4.15

Your boiler is providing central heating as normal, but it has stopped producing hot water when you turn on your taps.

Medium Engineer only £180-350

Parts commonly replaced

  • Diverter Valve Motor
  • Diverter Valve Cartridge
  • DHW Plate Heat Exchanger
Full explanation for 4.15
4.16

Your boiler has lost power or the screen has stopped working, meaning you cannot see the status of your heating and hot water.

High DIY-safe £100-£450

What to check first

  1. Check if your home's main electrical consumer unit has a tripped circuit breaker
  2. Ensure the boiler's power switch or fused spur on the wall is turned on
  3. Check if any other appliances in the house have lost power

Parts commonly replaced

  • Display PCB
  • Main Control PCB
  • Internal Fuse
Full explanation for 4.16
BLANK DISPLAY

Your boiler has no power or the control screen has failed, meaning the heating and hot water will not work until electricity is restored to the unit.

High DIY-safe £100-350

What to check first

  1. Check if other appliances in the house are working to rule out a general power cut.
  2. Inspect your main fuse box/consumer unit to see if the heating circuit tripper switch has flipped to 'OFF'.
  3. Check the fused spur switch (usually a red neon light switch near the boiler) to ensure it is turned on and the fuse hasn't blown.

Parts commonly replaced

  • Internal Fuse
  • Main Printed Circuit Board (PCB)
  • Display User Interface (UI) Board
Full explanation for BLANK DISPLAY
FAN FAULT

Your boiler has detected a problem with its internal fan and has shut down as a safety precaution, meaning you will not have any heating or hot water.

High Engineer only £250-£450

Parts commonly replaced

  • Fan assembly
  • Printed Circuit Board (PCB)
  • Wiring harness
Full explanation for FAN FAULT
FLAME LOSS

Your boiler is struggling to keep its internal flame lit, which means it has automatically shut itself down to ensure your home remains safe.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Condensate trap assembly
  • Flame rectification probe
Full explanation for FLAME LOSS
FLAME ON BEFORE GV ON

Your boiler has detected a flame inside the unit when it shouldn't be there, which indicates a potential safety issue and has caused the system to lock out to protect your home.

Emergency Engineer only £150-350

Parts commonly replaced

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

Related codes

Full explanation for FLAME ON BEFORE GV ON
FLOW THERMISTOR FAULT

Your boiler has lost the ability to accurately measure the temperature of the water flowing through it, so it has shut down to prevent overheating.

High Engineer only £120-180

Parts commonly replaced

  • Flow NTC sensor
Full explanation for FLOW THERMISTOR FAULT
FLOW/RETURN REVERSED

Your boiler has detected that the hot water pipes carrying heat to your radiators have been connected in the wrong direction, which typically happens after recent plumbing work.

High Engineer only £150-300

Parts commonly replaced

  • Pipework reconfiguration
  • Flow/Return sensor
Full explanation for FLOW/RETURN REVERSED
FLOW/RETURN THERMISTOR FAULT

Your boiler is struggling to accurately measure the temperature of the water flowing through the system, so it has stopped working as a safety precaution.

High Engineer only £120-220

Parts commonly replaced

  • Flow/Return NTC Thermistor
  • Wiring harness
Full explanation for FLOW/RETURN THERMISTOR FAULT
Showing 21–30 of 36
IGNITION LOCKOUT

Your boiler has failed to start the flame five times in a row and has now stopped trying for safety reasons.

High Engineer only £150-300

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Spark generator
Full explanation for IGNITION LOCKOUT
LOW MAINS VOLTAGE

Your boiler is receiving less electrical power than it needs to operate, which may be due to a loose wire, a power supply issue in your home, or a fault with the supply line to the property.

High Engineer only £100-£250

Parts commonly replaced

  • External fuse spur
  • Wiring connections
  • Main PCB
Full explanation for LOW MAINS VOLTAGE
LOW WATER PRESSURE

Your boiler has stopped working because the amount of water in your heating system has dropped below the required level.

High DIY-safe £80-120

What to check first

  1. Locate the filling loop (a silver flexi-hose) beneath the boiler.
  2. Open the valves on the hose to let water into the system until the pressure gauge reads between 1.0 and 1.5 bar.
  3. Close the valves firmly and check for any visible leaks around your radiators or the boiler.

Parts commonly replaced

  • Filling loop
  • Pressure relief valve
  • Expansion vessel
Full explanation for LOW WATER PRESSURE
NO CH BUT DHW OK

Your boiler is working properly to provide hot water, but it is failing to turn on your radiators to heat your home.

Medium Engineer only £120-250

Parts commonly replaced

  • Diverter valve
  • Central heating pump
  • Room thermostat
Full explanation for NO CH BUT DHW OK
NO CONNECTION TO PRIMARY PCB

Your boiler's internal computer is failing to communicate with the main control board, which has caused the system to stop operating until the connection is restored.

High Engineer only £150-300

Parts commonly replaced

  • Wiring harness
  • Main PCB
  • Display interface
Full explanation for NO CONNECTION TO PRIMARY PCB
NO DHW BUT CH OK

Your boiler is working fine for your radiators, but a faulty sensor or valve is failing to detect when you turn on a hot tap.

Medium Engineer only £150-300

Parts commonly replaced

  • DHW Flow Sensor
  • Diverter Valve
  • DHW NTC Thermistor
Full explanation for NO DHW BUT CH OK
NO WATER FLOW FAULT

Your boiler is failing to detect the water flowing through it, which prevents it from firing up to provide hot water or heating.

High Engineer only £150-250

Parts commonly replaced

  • Flow turbine
  • Diverter valve cartridge
  • Flow sensor
Full explanation for NO WATER FLOW FAULT
OUTSIDE SENSOR FAULT

Your boiler is temporarily ignoring the weather sensor outside your house and will work using its internal safety settings instead.

Low Engineer only £120-200

Parts commonly replaced

  • External weather sensor
  • Outdoor sensor wiring
Full explanation for OUTSIDE SENSOR FAULT
OVERHEAT LOCKOUT

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

High Engineer only £120-250

Parts commonly replaced

  • Pump
  • System filter
  • Heat exchanger
  • NTC thermistor
Full explanation for OVERHEAT LOCKOUT
PCB FAULT

Your boiler's main internal computer has developed a critical software or hardware failure and can no longer control the heating or hot water safely.

High Engineer only £350-£550

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Wiring harness
Full explanation for PCB FAULT
Showing 31–36 of 36
PUMP LOW VOLTAGE FAULT

Your boiler's water pump is not receiving the correct electrical signal, which means it cannot circulate heat to your radiators or taps.

High Engineer only £250-450

Parts commonly replaced

  • Central Heating Pump
  • PCB (Printed Circuit Board)
  • Wiring Harness
Full explanation for PUMP LOW VOLTAGE FAULT
PUMP ROTOR BLOCKED

Your boiler's water pump is struggling to spin, which prevents hot water from circulating through your radiators and taps.

High Engineer only £180-350

Parts commonly replaced

  • Circulation pump
  • Pump head
Full explanation for PUMP ROTOR BLOCKED
RETURN THERMISTOR FAULT

Your boiler is struggling to accurately measure the temperature of the water returning to it, so it has stopped heating to prevent potential damage.

High Engineer only £120-200

Parts commonly replaced

  • Return NTC thermistor
  • Wiring harness
Full explanation for RETURN THERMISTOR FAULT
THERMAL FUSE LOCKOUT

Your boiler has detected that it is running too hot and has automatically shut down to prevent damage or dangerous overheating.

Emergency Engineer only £150-300

Parts commonly replaced

  • Thermal fuse link
  • Overheat thermostat
  • Primary heat exchanger
Full explanation for THERMAL FUSE LOCKOUT
TOO MANY RESETS

Your boiler has attempted to restart itself too many times in a short period and has now locked itself to prevent potential damage.

High Engineer only £120-250

Parts commonly replaced

  • Ignition lead
  • Spark generator
  • PCB
  • Flame sensing electrode
Full explanation for TOO MANY RESETS
TOO MANY RESTARTS

Your boiler has struggled to stay running and has automatically shut down to protect itself after multiple failed attempts to ignite.

High Engineer only £150-300

Parts commonly replaced

  • Ignition Lead
  • Spark Electrode
  • Printed Circuit Board (PCB)
  • Gas Valve

Related codes

Full explanation for TOO MANY RESTARTS
Status & diagnostic codes

2 operating states & engineer diagnostics

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

PCB REPLACED Status Your boiler has recently had its main circuit board replaced and simply needs to be rebooted to confirm the change. SERVICE DUE Diagnostic Your boiler is working correctly, but it has been a year since its last official check-up and it is now requesting its annual safety service.
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