Common problems guide

The most common Ferroli Econcept 100 problems

The faults most likely to send a Ferroli Econcept 100 into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.
41 documented codes
6 most common
3 DIY-safe checks
3 engineer needed

The 6 most common faults

01
F04 High DIY-safe

Your boiler has stopped working because the water pressure inside your heating system has dropped too low to operate safely.

What to try first

Locate the external filling loop, which is a flexible silver hose connected under the boiler.Open the small valve on the loop to allow mains water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close the valve tightly ensuring it is fully shut to prevent over-pressurizing.

Est. cost
£80-120
Parts
Filling loop, Pressure relief valve, Pressure sensor
Full guide for F04
02
Low system water pressure High DIY-safe

Your boiler has stopped working because the amount of water inside your heating system has dropped below the required level.

What to try first

Locate the external filling loop, which is a silver braided hose with one or two small valves connecting your cold water main to your heating pipes.Open the valve(s) slowly and watch the pressure gauge on the front of the boiler until the needle reaches the green zone, typically between 1.0 and 1.5 bar.Close the valve(s) tightly to prevent over-pressurizing the system.

Est. cost
£0-£90
Parts
Filling loop, Pressure relief valve, Pressure sensor
Full guide for Low system water pressure
03
F37 High DIY-safe

Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.

What to try first

Locate the external filling loop, which is usually a silver flexible hose connected to two valves under your boiler.Gradually open the valves to let water into the system until the pressure gauge on the boiler front reads between 1.0 and 1.5 bar.Close both valves tightly and ensure the pressure gauge remains stable.

Est. cost
£80-150
Parts
Pressure relief valve, Expansion vessel, Pressure sensor
Full guide for F37
04
F01 High Engineer

Your boiler has failed to light the flame needed to produce heat or hot water.

Est. cost
£120-250
Parts
Ignition electrode, Gas valve, PCB
Full guide for F01
05
F03 High Engineer

Your boiler has detected that it is dangerously overheating and has automatically shut itself down to prevent damage.

Est. cost
£120-250
Parts
High limit thermostat, Central heating pump, Primary heat exchanger
Full guide for F03
06
F05 High Engineer

Your boiler has detected that the internal fan responsible for safely exhausting fumes is not spinning at the correct speed, so it has stopped working to prevent a safety issue.

Est. cost
£180-350
Parts
Fan assembly, Wiring harness, PCB
Full guide for F05
Parts most often replaced

on the Ferroli Econcept 100

Filling loopPressure relief valvePressure sensorExpansion vesselIgnition electrodeGas valve

Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.

Call a Gas Safe engineer if…

  • You can smell gas or see signs of a leak
  • The Ferroli shows an Emergency or High severity code
  • The boiler keeps locking out after repeated resets
  • You've tried the DIY checks and the fault hasn't cleared
  • There's visible water leaking from the boiler
  • The flame is yellow or orange instead of blue
See the full 41-code list for the Ferroli Econcept 100

Related guides

Boiler losing pressure → No hot water → When to replace → Symptom checker →