Biasi Dina 25C M280C.2025 SM Fault codes & diagnostics

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

Combi Natural Gas
GC Number 47-583-58
Download the Biasi Dina 25C M280C.2025 SM manualThe official installation and service manual (PDF), the document these fault codes were read from. PDF

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Severity at a glance

Each cell = one fault code. Hover to identify.
1 Emergency 16 High
Fault codes

All 17 documented codes

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E01

Your boiler has failed to ignite or lost its flame, meaning it has temporarily stopped working to keep you safe.

High DIY-safe £90-250

What to check first

  1. Check if your gas supply is working by testing another gas appliance like a cooker.
  2. Locate the reset button on your Biasi boiler and press it for 5 seconds to try restarting the system.
  3. Ensure your prepayment gas meter has credit if applicable.

Parts commonly replaced

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

Related codes

Full explanation for E01
E02

Your boiler has temporarily stopped working because a safety device has triggered due to overheating or a problem with water circulation.

High Engineer only £100-£250

Parts commonly replaced

  • Limit thermostat
  • NTC sensor
  • Circulating pump

Related codes

Full explanation for E02
E03

Your boiler has temporarily stopped working because it has detected an issue with the air pressure or exhaust removal.

High Engineer only £120-250

Parts commonly replaced

  • Air pressure switch
  • Flue assembly
  • Fan

Related codes

Full explanation for E03
E04

Your boiler has detected an issue with the water pressure inside the system, meaning it has temporarily stopped working to keep your home safe.

High DIY-safe

What to check first

  1. Locate the filling loop valves underneath your boiler.
  2. Open the valves slowly to let mains water into the heating system.
  3. Watch the pressure gauge on the front of the boiler until the needle reaches between 1.0 and 1.5 bar, then firmly close the valves.

Parts commonly replaced

  • Pressure relief valve
  • Pressure sensor

Related codes

Full explanation for E04
E05

Your boiler has stopped working because a sensor inside is failing to measure the temperature correctly, which is a common issue that a heating engineer can easily fix.

High Engineer only £120-250

Parts commonly replaced

  • Central Heating NTC Temperature Sensor
  • Domestic Hot Water NTC Sensor

Related codes

Full explanation for E05
E06

Your boiler has stopped working because it is not detecting hot water flowing out of it properly.

High Engineer only £120-250

Parts commonly replaced

  • Domestic hot water NTC sensor
  • Flow switch
  • PCB

Related codes

Full explanation for E06
E07

Your Biasi boiler has stopped working because the safety control that monitors the flow of water has detected a problem, meaning the heating and hot water have been turned off to prevent damage.

High Engineer only £120-250

Parts commonly replaced

  • Flow switch
  • Pressure sensor
  • Wiring harness

Related codes

Full explanation for E07
E08

Your boiler has detected an internal safety error related to the main circuit board or flame control, causing it to lock out and stop working.

High Engineer only £150-350

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring harness
  • Electrode assembly

Related codes

Full explanation for E08
E09

Your Biasi boiler has detected an internal safety issue with the gas valve or system electronics, causing it to lock out and stop working.

Emergency Engineer only £150-350

Parts commonly replaced

  • Gas valve
  • Printed Circuit Board (PCB)

Related codes

Full explanation for E09
E10

Your boiler has detected that the water pressure inside the system has dropped too low to operate safely.

High DIY-safe

What to check first

  1. Locate the filling loop underneath your boiler.
  2. Open the valves slowly to let mains water into the system until the pressure gauge reads between 1.0 and 1.5 bar.
  3. Close both valves tightly and check the gauge holds steady.

Parts commonly replaced

  • Pressure relief valve
  • Pressure sensor
  • Expansion vessel

Related codes

Full explanation for E10
E11

Your Biasi boiler has detected an internal electronic or communication error and has safely shut down.

High Engineer only £150-300

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring harness

Related codes

Full explanation for E11
E14

Your Biasi boiler has stopped working because a safety sensor has detected a problem with the flow of water inside the system.

High Engineer only £150-300

Parts commonly replaced

  • Flow sensor
  • NTC thermistor
  • Main PCB

Related codes

Full explanation for E14
E22

Your boiler has stopped working because it has detected an issue with the electrical wiring connection to the control board.

High Engineer only £100-250

Parts commonly replaced

  • Wiring harness
  • Printed Circuit Board (PCB)

Related codes

Full explanation for E22
E25

Your boiler has detected a potential blockage or a problem with water circulation, so it has safely shut down to prevent overheating.

High Engineer only £150-300

Parts commonly replaced

  • Circulating pump
  • Flow sensor
  • Heat exchanger

Related codes

Full explanation for E25
E26

Your boiler has stopped working because the internal water pressure has dropped too low.

High DIY-safe

What to check first

  1. Locate the filling loop valves underneath your boiler.
  2. Open the valves gently to let water in until the pressure gauge reads between 1.0 and 1.5 bar.
  3. Close the valves firmly and check the gauge holds steady.

Parts commonly replaced

  • Pressure relief valve
  • Filling loop
  • Pressure sensor

Related codes

Full explanation for E26
E50

Your boiler has detected an issue with its internal sensors or water flow, and has safely shut down to prevent damage.

High Engineer only £150-300

Parts commonly replaced

  • NTC Thermistor
  • Flow sensor
  • Printed Circuit Board (PCB)

Related codes

Full explanation for E50
E52

Your boiler has detected an issue with the electronic control board communication or settings, which has temporarily stopped it from operating safely.

High Engineer only £150-350

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring harness

Related codes

Full explanation for E52
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