Grant Vortex Eco External Floor Standing Fault codes & diagnostics

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

Regular Oil 2008-2016 Discontinued

Replaced by: Grant VortexBlue

Download the Grant Vortex Eco External Floor Standing manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

This boiler uses indicator light combinations

Note which lights are on, off, or flashing and at what speed. Match the combination to the cards below. Do not reset until you have noted the pattern. How to read fault codes →

Severity at a glance

Each cell = one fault code. Hover to identify.
2 Emergency 40 High 1 Medium 1 Low

All 44 documented codes

Tap any card for details

Blinking RED

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

Medium Engineer only £120-250

Parts commonly replaced

  • Circulating pump
  • Overheat thermostat
  • System filter

Related codes

BURNER (FLASHING)

Your boiler's electronic brain is unable to communicate correctly, which has caused it to lock out to prevent unsafe operation.

High Engineer only £250-450

Parts commonly replaced

  • Control PCB
  • Wiring loom

Related codes

BURNER indicator flashing

Your boiler's main control computer is experiencing an error, which has caused it to stop the burner from operating to prevent further issues.

High Engineer only £250-450

Parts commonly replaced

  • Control PCB
  • Wiring harness

Related codes

BURNER indicator Slow flash

Your boiler's electronic brain is malfunctioning and needs to be replaced by a professional to get your heating system running again.

High Engineer only £250-400

Parts commonly replaced

  • Printed Circuit Board (PCB)
CH PUMP indicator Slow flash

Your boiler's internal control brain is experiencing an electronics failure and can no longer reliably signal the system to move hot water around your home.

High Engineer only £250-450

Parts commonly replaced

  • Main PCB (Printed Circuit Board)
DHW PUMP (FLASHING)

Your boiler is struggling to detect the temperature of your hot water supply, which means it will likely stop heating your water until a faulty sensor or internal control board is replaced.

High Engineer only £150-300

Parts commonly replaced

  • Store thermistor
  • Printed Circuit Board (PCB)
DHW PUMP indicator Fast flash

Your boiler is struggling to accurately measure the temperature of the water inside its internal storage tank, which means it may fail to provide hot water correctly.

High Engineer only £120-220

Parts commonly replaced

  • DHW Store thermistor
DHW PUMP indicator FLASHING

Your boiler is having trouble communicating with one of its internal temperature sensors, which means it has stopped providing hot water as a safety precaution.

High Engineer only £150-300

Parts commonly replaced

  • DHW store thermistor
  • Main PCB
DHW PUMP indicator Slow flash

Your boiler's electronic brain is experiencing a minor internal error and needs a service visit to replace a faulty control component.

High Engineer only £250-400

Parts commonly replaced

  • Printed Circuit Board (PCB)
Showing 11–20 of 44
Flashes red

Your boiler has stopped heating because the internal water pump, which moves hot water around your house, has seized up or failed and cannot restart itself.

High Engineer only £250-450

Parts commonly replaced

  • Circulator pump
  • Pump capacitor
  • Wiring harness
Flashes red/green

Your boiler is struggling because the internal water pump is stuck or not receiving power, which prevents heat from circulating through your home.

High Engineer only £150-300

Parts commonly replaced

  • Central heating pump
  • Pump electrical cable
  • PCB
GREEN blinking

Your boiler is struggling to light itself correctly because the internal firing mechanism is becoming partially blocked or worn out.

High Engineer only £120-220

Parts commonly replaced

  • Oil nozzle
  • Ignition electrodes
  • Photocell
GREEN, RED blinking

Your boiler has detected an internal light source that shouldn't be there, so it has safely shut itself down to prevent ignition.

High Engineer only £120-250

Parts commonly replaced

  • UV sensor
  • Burner control box

Related codes

Green/Red flashing

Your boiler has detected light inside the combustion chamber when it should be dark, causing it to lock itself out as a safety precaution.

High Engineer only £120-250

Parts commonly replaced

  • Photocell sensor
  • Control box

Related codes

LOW PRESSURE indicator lit

Your boiler has stopped working because the amount of water in your heating system is too low to run safely.

High DIY-safe £0-£100

What to check first

  1. Locate the external filling loop, which is a flexible silver hose connecting your cold water mains to your heating pipes.
  2. Open the valves at both ends of the filling loop slowly to let water into the system until the pressure gauge reads between 1.0 and 1.5 bar.
  3. Close both valves tightly to prevent over-pressurizing the system.

Parts commonly replaced

  • Pressure Relief Valve
  • Pressure Gauge
  • Filling Loop

Related codes

RED blinking

Your boiler is failing to start because it detects light inside the combustion chamber when it should be completely dark, preventing it from igniting safely.

High Engineer only £120-220

Parts commonly replaced

  • Photocell
  • Burner control box

Related codes

RED blinking (0.5s)

Your boiler has detected a signal that it is already burning fuel even though it has not been told to start, so it has safely shut itself down to prevent an unsafe situation.

High Engineer only £150-300

Parts commonly replaced

  • Flame sensor
  • Control box
  • Wiring harness
RED fast blinking

Your boiler has stopped working because it failed to light the burner, meaning you currently have no heating or hot water.

High Engineer only £120-250

Parts commonly replaced

  • Photocell
  • Ignition transformer
  • Oil nozzle
  • Control box

Related codes

Showing 21–30 of 44
RED fast blinking (0.2s)

Your boiler has failed to start after several repeated attempts and has now automatically shut down for safety to prevent fuel buildup.

High Engineer only £120-250

Parts commonly replaced

  • Photocell
  • Oil nozzle
  • Ignition electrodes
  • Control box

Related codes

RED flashing (Reset button)

Your boiler has disabled itself for safety after multiple failed attempts to start the burner, and it now requires a specific cooling period or a professional reset to clear the lock.

High Engineer only £120-250

Parts commonly replaced

  • Control box
  • Photocell
  • Ignition electrodes
  • Oil nozzle

Related codes

RED, GREEN blinking inverted

Your boiler has detected an internal electrical issue affecting the fuel delivery system, which is preventing it from firing up safely.

High Engineer only £150-300

Parts commonly replaced

  • Control box
  • Oil solenoid valve
  • Wiring loom
RED, ORANGE blinking inverted

Your boiler is unable to safely vent exhaust gases because the air-moving fan inside the unit has failed or lost its electrical connection.

High Engineer only £200-400

Parts commonly replaced

  • Fan motor unit
  • Wiring harness
  • Control board
Slow flash

Your boiler's electronic brain is experiencing a communication error, which is preventing it from firing up reliably.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring Harness
10

Your boiler is struggling to push out fumes correctly when it tries to start, which can lead to dangerous exhaust gases leaking into the air supply.

Emergency Engineer only £120-250

Parts commonly replaced

  • Flue terminal
  • Burner combustion seal
  • Air intake filter
12

Your boiler is detecting that exhaust fumes are not properly contained, which means there is a potential risk of dangerous gases escaping into your home environment.

Emergency Engineer only £120-250

Parts commonly replaced

  • Combustion chamber seals
  • Flue outlet gasket
  • Burner head gasket
A2.2

Your boiler's water circulation pump has stopped working, which means the system cannot push hot water to your radiators or taps.

High Engineer only £150-300

Parts commonly replaced

  • Circulator pump
  • Pump cable harness
  • PCB

Related codes

A3.2

Your boiler's internal water pump is failing to circulate water correctly, which means your heating and hot water will not work until the issue is resolved.

High Engineer only £200-450

Parts commonly replaced

  • Circulator pump
  • Pump wiring harness
  • Printed Circuit Board (PCB)

Related codes

Showing 31–40 of 44
Burner lock-out

Your boiler has detected a temporary issue with the burner and has safely shut itself down to prevent any damage.

High DIY-safe £120-250

What to check first

  1. Check your oil tank to ensure you have enough fuel and that the supply valve is open
  2. Wait 60 seconds for the internal control unit to reset
  3. Gently press the illuminated red reset button located on the burner once

Parts commonly replaced

  • Photocell
  • Ignition electrodes
  • Oil nozzle
  • Control box
Constant RED

Your boiler has detected that the water inside it is getting too hot and has automatically paused to prevent overheating, but it should restart once it has cooled down sufficiently.

High Engineer only £120-250

Parts commonly replaced

  • Circulation pump
  • System filter
  • Thermostat sensor

Related codes

LED off

Your boiler has completely lost power and is unable to turn on, meaning it cannot provide any heating or hot water.

High Engineer only £120-250

Parts commonly replaced

  • Fuse
  • Control board
  • Power supply cable
Lock-out

Your boiler has detected a problem with the burner ignition and has safely shut itself down to prevent any issues.

High Engineer only £120-250

Parts commonly replaced

  • Photocell
  • Ignition electrodes
  • Oil pump solenoid coil
  • Control box
Lock-out (light on)

Your boiler has stopped itself from running as a safety precaution because the fuel failed to ignite properly.

High DIY-safe £120-250

What to check first

  1. Check your external oil tank has enough fuel and the isolation valve is fully open
  2. Locate the red reset button on the burner casing or control box
  3. Press and hold the reset button for 3 seconds then release to attempt a restart

Parts commonly replaced

  • Photocell
  • Ignition electrodes
  • Oil pump
  • Control box

Related codes

Lockout

Your boiler has stopped working to protect itself and needs a manual reset to try and start up again.

High DIY-safe £120-250

What to check first

  1. Locate the red reset button on the burner control box
  2. Press and hold the button for 3 seconds, then release
  3. Wait to hear if the burner ignites; if it locks out again, do not force further resets

Parts commonly replaced

  • Photocell
  • Ignition electrodes
  • Oil burner control box
  • Oil pump
Lockout button lit

Your boiler has detected an issue preventing it from lighting and has shut down for safety; it needs a manual reset to try and start again.

High Engineer only £120-250

Parts commonly replaced

  • Photocell
  • Ignition electrodes
  • Oil nozzle
  • Control box
LOW PRESSURE

The water pressure inside your heating system has dropped too low, so the boiler has turned itself off to prevent any damage.

High DIY-safe £80-150

What to check first

  1. Locate the external filling loop, which is usually a flexible silver hose connecting two valves near your boiler.
  2. Open the valves on both ends of the hose to allow water into the system until the pressure gauge needle reaches between 1.0 and 1.5 bar.
  3. Close both valves tightly and remove the hose if required by your specific installation.

Parts commonly replaced

  • Pressure relief valve
  • Expansion vessel
  • Pressure switch
OFF

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

High Engineer only £90-200

Parts commonly replaced

  • External fuse
  • Safety thermostat
  • Control PCB
ORANGE

Your boiler’s electrical supply is unstable, meaning the electricity coming from your home is not consistent enough for the boiler to operate safely.

High Engineer only £150-300

Parts commonly replaced

  • Control PCB
  • Wiring harness
Showing 41–44 of 44
Overheat

Your boiler has automatically turned itself off because it has become too hot, which is a safety feature to prevent damage or dangerous conditions.

High Engineer only £150-300

Parts commonly replaced

  • Overheat thermostat
  • Circulating pump
  • PCB
  • System filter
Overheat thermostat

Your boiler has switched itself off because it has become dangerously hot, likely due to a circulation problem or a system blockage.

High Engineer only £150-300

Parts commonly replaced

  • Overheat thermostat
  • Circulator pump
  • System filter
  • Primary heat exchanger

Related codes

RED

Your boiler has stopped working because it failed to ignite or stay lit, requiring an internal safety reset.

High Engineer only £120-250

Parts commonly replaced

  • Photocell
  • Control box
  • Oil nozzle
  • Ignition electrodes
RED steady ON

Your boiler has stopped working because it failed to light the fuel inside, likely due to a blockage in the oil supply or a dirty sensing component.

High Engineer only £150-300

Parts commonly replaced

  • Photocell sensor
  • Oil nozzle
  • Ignition electrode
  • Control box

Related codes

29 operating states & engineer diagnostics

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

GREEN blinking (0.5s) Status Your boiler is currently undergoing a safety timing delay, which typically occurs after it has failed to ignite successfully on the first attempt. GREEN ORANGE blinking (0.5s) Status Your boiler is currently preparing itself to ignite by clearing out the combustion chamber, which is a normal part of the startup cycle. ORANGE blinking Status Your boiler is currently just waking up and going through a brief safety check before it ignites the flame to start heating your home. 18 Diagnostic Your boiler is struggling to get enough fresh air to burn fuel properly, which is likely due to the ventilation openings in your wall or enclosure being blocked. 21.0 Diagnostic Your boiler is currently running at its maximum factory power setting and is showing this as an informational status code rather than a fault. 22 Diagnostic Your boiler is failing to get enough fresh air from outside, which is necessary for it to burn fuel safely and efficiently. 26.0 Diagnostic Your boiler is displaying a status code indicating it is currently running at its maximum heating capacity, which is a normal operational setting rather than a system error. 31 Diagnostic Your boiler is struggling to get the fresh air it needs to run safely and efficiently because its ventilation path is blocked or insufficient. 36 Diagnostic Your boiler is struggling because it does not have enough fresh air coming into the room to burn the fuel safely and efficiently. 36.0 Diagnostic Your boiler is operating at its maximum heat output setting, which is a configuration parameter rather than a system failure. 44 Diagnostic Your boiler is struggling to get enough fresh air for safe combustion, often due to an obstruction in the air intake or flue pipe. 54 Diagnostic Your boiler is failing to get enough fresh air, which is essential for it to burn fuel safely and efficiently. 61 Diagnostic Your boiler is failing to get enough fresh air from outside to burn its fuel safely and efficiently. 69 Diagnostic Your boiler is struggling because it is not receiving enough fresh air from outside, which is necessary for it to run safely and efficiently. 92 Diagnostic Your boiler is signalling that the dedicated air supply vent required for safe combustion is too small or restricted, which is preventing the boiler from drawing enough fresh air to operate safely. 116 Diagnostic Your boiler is struggling to get enough fresh air because the external ventilation opening is likely blocked or too small. 143 Diagnostic Your boiler is struggling because it cannot get enough fresh air from outside to burn its fuel safely. 198 Diagnostic Your boiler is struggling because it cannot draw in enough fresh air to burn fuel properly, which is essential for safe operation. 232 Diagnostic Your boiler is struggling because it does not have enough fresh air coming into the area where it is installed to burn fuel safely. 286 Diagnostic Your boiler is struggling to get enough fresh air for safe operation, which is typically caused by a blockage or an issue with the air intake vents. 348 Diagnostic Your boiler is struggling because it is not receiving enough fresh air from outside to burn its fuel safely and efficiently. 396 Diagnostic Your boiler is struggling to get enough fresh air for safe operation because the external ventilation opening is likely blocked or obstructed. 429 Diagnostic Your boiler is struggling to get enough fresh air for safe operation because the permanent ventilation opening in your external wall is likely blocked or obstructed. 594 Diagnostic Your boiler is struggling because it cannot get enough fresh air from the outside to burn fuel safely and efficiently. 727 Diagnostic Your boiler is displaying a recognition code because it is identifying its internal configuration settings, rather than indicating a system malfunction. 728 Diagnostic Your boiler is displaying its specific model identification code, which is an internal manufacturer setting rather than a functional fault or error. 729 Diagnostic Your boiler is displaying an internal identification code rather than an active fault, indicating the system's computer may need to be reset or reconfigured by a professional. A1.2 Diagnostic Your boiler is simply indicating that the burner is currently active and functioning as expected. GREEN Status Your boiler is working exactly as it should and there are no issues detected.