Ariston Genus ONE+ WiFi Fault codes & diagnostics

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

Combi Natural Gas 2023-present
GC Numbers 47-116-9947-888-0147-888-02
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Severity at a glance

Each cell = one fault code. Hover to identify.
13 High 4 Medium 1 Low
Versions & GC numbers

Which version do you have?

The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.

GC number Appliance (register name) Produced
47-116-99 GENUS ONE+ WIFI 24 3302396 2023–present
47-888-01 GENUS ONE+ WIFI 30 3302397 2023–present
47-888-02 GENUS ONE+ WIFI 35 3302398 2023–present

Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.

Just want the most common Ariston Genus ONE+ WiFi faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 18 documented codes

Tap any card for details

101

Your boiler has switched itself off because it has reached a temperature that is too high, which usually means the water isn't flowing through the system correctly.

High DIY-safe £100-350 Shared across the range

What to check first

  1. Check that your radiator valves (TRVs) are open and not turned to the 'off' position
  2. Ensure the boiler pressure is between 1 and 1.5 bar on the display
  3. Press the 'Reset' button on the front panel to see if the fault clears

Parts commonly replaced

  • Circulation Pump
  • Overheat Thermostat
  • Main Heat Exchanger (Flushing)

Related codes

Full explanation for 101
103

Your boiler has detected that the water is heating up too quickly, which usually means the water isn't moving around the system properly.

High DIY-safe £120-£350 Shared across the range

What to check first

  1. Check that your radiator valves are fully open
  2. Ensure your boiler pressure is between 1 and 1.5 bar
  3. Gently bleed your radiators to remove any trapped air
  4. Restart the boiler using the reset button

Parts commonly replaced

  • Circulation Pump
  • Main Heat Exchanger (Cleaning)
  • Flow/Return Thermistors

Related codes

Full explanation for 103
104

Your boiler has detected that water is heating up too quickly or not moving through the system fast enough, causing it to shut down to prevent overheating.

High DIY-safe £120-350 Shared across the range

What to check first

  1. Check that all radiator valves are fully open
  2. Ensure the boiler pressure is between 1 and 1.5 bar on the display
  3. Bleed all radiators to remove trapped air
  4. Reset the boiler using the 'Reset' button

Parts commonly replaced

  • Circulation Pump
  • Main Heat Exchanger (Cleaning/Descaling)
  • Temperature Sensors (NTC)

Related codes

Full explanation for 104
105

Your boiler has sensed that water is not moving through the system quickly enough, causing it to overheat and shut down for safety.

High DIY-safe £100-350 Shared across the range

What to check first

  1. Check that all radiator valves are fully open
  2. Check if the system pressure is between 1 and 1.5 bar on the display
  3. Bleed all radiators to remove trapped air

Parts commonly replaced

  • Circulation Pump
  • Central Heating Filter
  • Main Heat Exchanger (Cleaning)

Related codes

Full explanation for 105
106

Your boiler has stopped working because the water returning from your radiators is significantly hotter than the water leaving the boiler, suggesting the water isn't flowing correctly.

High DIY-safe £120-350 Shared across the range

What to check first

  1. Ensure all radiator valves (TRVs) are turned to the highest setting
  2. Check that at least one radiator or bypass valve is fully open
  3. Bleed all radiators to remove trapped air locks

Parts commonly replaced

  • Circulation Pump
  • Return Temperature Sensor (NTC)
  • Main Heat Exchanger (if blocked)

Related codes

Full explanation for 106
112

Your boiler has detected a problem with the sensor that monitors water returning from your radiators, causing the system to stop working as a safety precaution.

High Engineer only £90-160 Shared across the range

Parts commonly replaced

  • CH Return Temperature Probe (NTC)
  • Wiring Harness

Related codes

Full explanation for 112
114

Your boiler has lost its connection to the outside temperature sensor, which means it cannot automatically adjust its settings based on the weather outdoors.

Low Engineer only £90-160 Shared across the range

Parts commonly replaced

  • External temperature sensor
  • Sensor wiring

Related codes

Full explanation for 114
162

Your boiler’s internal computer has lost its specific configuration settings and no longer knows how to operate correctly.

High Engineer only £120-350 Shared across the range

Parts commonly replaced

  • Main PCB (Printed Circuit Board)
  • Display Interface

Related codes

Full explanation for 162
301

Your boiler's internal computer memory has encountered a reading or writing error, preventing the system from functioning correctly.

High Engineer only £250-£450 Shared across the range

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Display PCB Board

Related codes

Full explanation for 301
302

Your boiler's main control board has lost connection with the display panel, meaning the internal parts are no longer speaking to each other correctly.

High DIY-safe £120-350 Shared across the range

What to check first

  1. Turn the boiler power off at the fused spur switch (the wall switch near the boiler).
  2. Wait for 60 seconds.
  3. Turn the power back on and see if the display reboots and clears the error.

Parts commonly replaced

  • Display PCB
  • Main Control PCB
  • Display Connection Cable

Related codes

Full explanation for 302
303

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

High Engineer only £280-450 Shared across the range

Parts commonly replaced

  • Main PCB (Printed Circuit Board)
  • Display PCB Board

Related codes

Full explanation for 303
304

Your boiler has locked itself as a safety precaution because the reset button has been pressed too many times in a short period.

High DIY-safe £0-120 Shared across the range

What to check first

  1. Turn off the power to the boiler at the fused spur switch.
  2. Wait for at least 15 minutes to allow the internal safety timer to clear.
  3. Turn the power back on and see if the boiler restarts without needing another reset.

Parts commonly replaced

  • No parts usually required
  • Main PCB (if software loop occurs)

Related codes

Full explanation for 304
313

Your boiler has detected an internal electrical supply issue that is preventing it from starting up correctly.

High Engineer only £180-450 Shared across the range

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Internal wiring harness

Related codes

Full explanation for 313
504

Your boiler is struggling to keep the flame lit because the flame is physically 'lifting' away from the burner, causing the system to shut down for safety.

High Engineer only £100-350 Shared across the range

Parts commonly replaced

  • Ionisation electrode
  • Gas valve
  • Burner gasket
  • Fan

Related codes

Full explanation for 504
701

Your boiler has detected a problem with the sensor that monitors water temperature for your main heating circuit, meaning it cannot manage the heat correctly.

Medium Engineer only £120-£200 Shared across the range

Parts commonly replaced

  • Zone 1 flow temperature sensor (NTC)
  • Sensor wiring harness

Related codes

Full explanation for 701
702

Your boiler is having trouble managing the temperature for your second heating zone, which may result in that specific area of your home not heating correctly.

Medium Engineer only £120-220 Shared across the range

Parts commonly replaced

  • Zone 2 Flow Temperature Probe
  • Connecting Wiring Harness

Related codes

Full explanation for 702
703

Your boiler has detected a problem with the sensor that monitors water flow for your third heating zone, meaning that specific area may not heat up correctly.

Medium Engineer only £120-220 Shared across the range

Parts commonly replaced

  • Zone flow sensor
  • Sensor wiring harness

Related codes

Full explanation for 703
722

Your boiler has detected that the temperature in your secondary heating zone, such as an upstairs floor or an extension, is getting too hot and has shut down as a safety precaution.

Medium DIY-safe £120-280 Shared across the range

What to check first

  1. Check that all radiator valves in Zone 2 are turned fully open.
  2. Ensure there are no obstructions like furniture blocking airflow to these radiators.
  3. Restart the boiler using the Reset button to see if the fault clears.

Parts commonly replaced

  • Zone Valve
  • Circulation Pump
  • Temperature NTC Sensor

Related codes

Full explanation for 722
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