Biasi Dina Fault codes & diagnostics

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

Combi Natural GasLPG 25-30 kW 2024-present

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Severity at a glance

Each cell = one fault code. Hover to identify.
16 High 1 Medium 5 Low
Just want the most common Biasi Dina faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 22 documented codes

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01

Your boiler is currently running a special system test used by engineers and is operating at its lowest power setting.

Low DIY-safe £0-80

What to check first

  1. Wait approximately 15 minutes for the automated test cycle to finish
  2. Turn the boiler mode selector knob to 'Off' and back to 'Winter' or 'Summer' to reset the mode
  3. Press the 'Reset' button if the screen does not return to normal temperature display

Related codes

Full explanation for 01
02

Your boiler is currently running a manual test mode designed for engineers to check performance, and it is not a standard functional fault.

Low DIY-safe £0-80

What to check first

  1. Switch the boiler to the 'Off' or 'Standby' position
  2. Wait 30 seconds
  3. Switch the boiler back to the 'On' or 'Winter/Summer' mode to exit the test sequence

Related codes

Full explanation for 02
E01

Your boiler has failed to light or cannot detect a flame, meaning your heating and hot water will not work.

High DIY-safe £100-350

What to check first

  1. Check if your gas supply is turned on and other gas appliances are working
  2. Press and hold the Reset button for five seconds
  3. Ensure your condensate pipe has not frozen if the weather is extremely cold

Parts commonly replaced

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

Related codes

Full explanation for E01
E02

Your boiler has shut down because it has detected it is getting too hot, likely due to a circulation issue or a sensor fault.

High DIY-safe £90-250

What to check first

  1. Ensure all radiator valves (TRVs) are fully open to allow water flow
  2. Check that the boiler pressure is between 1.0 and 1.5 bar on the gauge
  3. Press the 'Reset' button on the front of the boiler control panel

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Temperature NTC Sensor

Related codes

Full explanation for E02
E03

Your boiler has shut down because it has detected that the exhaust gases are becoming too hot, which is a safety feature to prevent damage to the internal components.

High Engineer only £120-£250

Parts commonly replaced

  • Flue NTC sensor
  • Heat exchanger
  • Main PCB

Related codes

Full explanation for E03
E04

Your boiler has stopped working because the water pressure is too low for the system to run safely.

High DIY-safe £0-160

What to check first

  1. Locate the filling loop (usually a silver flexible hose) underneath the boiler.
  2. Slowly open the valve(s) until you hear water flowing and watch the pressure gauge.
  3. Close the valve(s) tightly once the pressure gauge reaches between 1 and 1.5 bar.

Parts commonly replaced

  • Water pressure switch
  • Expansion vessel recharge
  • Filling loop valve

Related codes

Full explanation for E04
E05

Your boiler has identified a problem with the ventilation system that clears away exhaust fumes, causing it to shut down for safety.

High Engineer only £150-350

Parts commonly replaced

  • Fan assembly
  • Air pressure switch
  • Venturi tube

Related codes

Full explanation for E05
E06

Your boiler has detected a problem with the internal sensor that monitors the temperature of the water heading to your radiators and taps.

High Engineer only £90-160

Parts commonly replaced

  • Central heating flow NTC thermistor
  • Wiring harness

Related codes

Full explanation for E06
E07

Your boiler is having trouble measuring the temperature of your hot water, which usually means it cannot provide consistent heat at your taps.

Medium Engineer only £90-160

Parts commonly replaced

  • Domestic Hot Water (DHW) NTC thermistor
  • Connecting wiring harness

Related codes

Full explanation for E07
E08

Your boiler has detected an issue with its exhaust system or the sensor that monitors flue gas temperatures, causing it to shut down for safety.

High Engineer only £120-200

Parts commonly replaced

  • Flue Gas NTC Sensor
  • Wiring Harness
  • Main Heat Exchanger cleaning

Related codes

Full explanation for E08
Showing 11–20 of 22
E09

Your boiler has detected that the exhaust gases are either too hot or are not flowing correctly through the flue pipe, causing the system to shut down for safety.

High Engineer only £120-250

Parts commonly replaced

  • Flue gas NTC sensor
  • Main PCB
  • Flue terminal

Related codes

Full explanation for E09
E10

Your boiler has detected a safety issue with its internal wiring or a heat-related fuse, causing it to shut down to prevent damage.

High Engineer only £120-£250

Parts commonly replaced

  • Safety thermal fuse
  • Detection electrode
  • Wiring harness

Related codes

Full explanation for E10
E11

Your boiler thinks it sees a flame even though it hasn't started the ignition process yet, causing it to shut down for safety.

High Engineer only £120-£250

Parts commonly replaced

  • Flame detection electrode
  • Ionisation probe
  • PCB (Printed Circuit Board)

Related codes

Full explanation for E11
E14

Your boiler has stopped working because water is not moving around the heating system correctly.

High DIY-safe £180-350

What to check first

  1. Check that your boiler pressure is between 1.0 and 1.5 bar
  2. Ensure all radiator valves and internal stop taps are fully open
  3. Gently bleed your radiators to remove trapped air

Parts commonly replaced

  • Circulation pump
  • Main heat exchanger
  • Flow / Return thermistors

Related codes

Full explanation for E14
E22

Your boiler's computer brain is confused about its settings or is having trouble communicating with the internal gas controls.

High Engineer only £180-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Gas Valve
  • Wiring Loom
Full explanation for E22
E25

Your boiler's internal computer has developed a fault and is unable to manage the system's operations.

High Engineer only £250-£450

Parts commonly replaced

  • Main Electronic Control Board (PCB)

Related codes

Full explanation for E25
E26

Your boiler's main internal computer has developed a fault and is unable to communicate with the rest of the unit.

High Engineer only £250-£450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)

Related codes

Full explanation for E26
E50

Your boiler's internal computer has encountered a critical error and can no longer control the heating or hot water functions.

High Engineer only £250-£450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)

Related codes

Full explanation for E50
E52

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

High Engineer only £250-£450

Parts commonly replaced

  • Main Electronic PCB
  • Wiring Loom
Full explanation for E52
OFF

Your boiler is currently set to standby mode or has been switched off manually, meaning it will not provide any heating or hot water until it is turned back on.

Low DIY-safe £0

What to check first

  1. Check that the main power switch is turned on
  2. Rotate the main selector dial from the 'OFF' or 'Standby' position to either the 'Hot Water Only' or 'Heating and Hot Water' icon
  3. Check if your external room thermostat or programmer is calling for heat
Full explanation for OFF
Showing 21–22 of 22
P00

Your boiler has entered its internal settings menu and is waiting for a technician to program the controls.

Low DIY-safe £0-80

What to check first

  1. Check if any buttons on the control panel are stuck or being pressed down.
  2. Turn the selector dial to the 'Off/Reset' position for 30 seconds.
  3. Turn the dial back to the 'Winter' or 'Summer' setting to exit the menu.
Full explanation for P00
P06

Your boiler is currently running in a special test mode used by engineers to check emissions or adjust power output, meaning it is not in its normal operating state.

Low DIY-safe £0

What to check first

  1. Locate the selector dial or menu buttons on the control panel.
  2. Turn the selector away from the 'test' or 'chimney' symbol back to the 'On' or 'Auto' position.
  3. Wait for the boiler to cycle through its shutdown sequence to return to normal operation.
Full explanation for P06