Biasi Dina Fault codes & diagnostics

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

Combi Natural GasLPG 25-30 kW 2024-present
GC Numbers 47-583-5847-583-5947-583-60
Download the Biasi Dina 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 12 High 2 Medium 1 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 17 documented codes

Tap any card for details

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's computer memory has encountered a data error, preventing it from functioning correctly.

High Engineer only £150-300

Parts commonly replaced

  • Printed Circuit Board (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
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 that the gases produced by the flame are becoming too hot, so it has safely shut itself down to prevent damage.

Emergency Engineer only £150-300

Parts commonly replaced

  • Flue gas thermostat
  • Heat exchanger
  • NTC sensor

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 has detected that the water inside the system is becoming dangerously hot and has shut itself down to prevent damage.

High Engineer only £120-250

Parts commonly replaced

  • NTC temperature sensor
  • Pump
  • Heat exchanger

Related codes

Full explanation for E22
E25

Your boiler has detected that the internal temperature is extremely low and has automatically activated its protection mode to prevent the pipes from freezing.

Low DIY-safe

What to check first

  1. Check that your heating timer is set to come on during cold spells to keep the system warm.
  2. Ensure the boiler is switched on and not isolated at the electrical spur.
  3. If the boiler remains in this mode while the home is warm, turn the boiler off at the mains for 30 seconds and restart it.

Parts commonly replaced

  • NTC Temperature Sensor
  • PCB

Related codes

Full explanation for E25
E26

Your boiler has detected an issue with the component that controls the gas supply, meaning it has shut down as a safety precaution and will not provide heating or hot water.

Emergency Engineer only £150-300

Parts commonly replaced

  • Gas valve
  • Wiring harness
  • PCB

Related codes

Full explanation for E26
E50

Your boiler has lost its connection to its wall-mounted controller, meaning it doesn't know when to turn the heating or hot water on.

High Engineer only £120-250

Parts commonly replaced

  • PCB
  • Remote control unit
  • Communication wiring harness

Related codes

Full explanation for E50
E52

Your boiler has locked itself as a safety precaution because it has been manually reset too many times in a short period.

Medium Engineer only £100-200

Parts commonly replaced

  • Control PCB

Related codes

Full explanation for E52
Status & diagnostic codes

5 operating states & engineer diagnostics

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

01 Diagnostic Your boiler is currently running a special system test used by engineers and is operating at its lowest power setting. 02 Diagnostic Your boiler is currently running a manual test mode designed for engineers to check performance, and it is not a standard functional fault. OFF Status 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. P00 Diagnostic Your boiler has entered its internal settings menu and is waiting for a technician to program the controls. P06 Diagnostic 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.
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