Ferroli fault code A04
Fault code A04 on a Ferroli boiler (including BlueSense 4 and BlueSense 5) means: Flue gas temperature too high. The flue gas temperature has been higher than 95°C 3 times within 24 hours. Reset the appliance once. If the code comes back, a part is usually faulty. You can check the water pressure and settings yourself; leave work on gas-carrying parts to a certified gas engineer.
After a safety alert (gas, flue gas, combustion), reset no more than once and call in a certified gas engineer. If you smell gas, call your national gas emergency number or 112 immediately.
Cause
Fault code A04 on a Ferroli boiler indicates: Flue gas temperature too high. The flue gas temperature has been higher than 95°C 3 times within 24 hours.
Applies to
Ferroli BlueSense 4, BlueSense 5, 12/22/32.
Fault code A04 on other Ferroli series
The same code does not mean the same thing on every series. Check the rating plate to see which series you have:
- A 04 on Econforte, HMA 23, HMA 32, HMC 23, HMC 32: Gas valve relay faulty.
Matching parts
Ferroli parts are available from Instalpunt; shipping to EU countries from €12.95 (€16.95 for more distant countries), usually 3–5 working days.
This message does not point directly to one faulty part. If the code keeps coming back, view the Ferroli parts:
Fix it yourself or call an engineer?
Always consult the manual for your appliance and work safely. If in doubt or if the fault comes back, call in a qualified professional. A question about a part? Write to us at info@instalpunt.nl.
Frequently asked questions
What does Ferroli boiler fault code A04 mean?
Flue gas temperature too high. The flue gas temperature has been higher than 95°C 3 times within 24 hours.
How do I fix fault code A04 on a Ferroli boiler?
First check the cause described above. Then restart the appliance using the reset button. If the message comes back, a part usually needs replacing or the fault needs to be repaired by a qualified professional.
Which parts do I need for Ferroli fault code A04?
That depends on the exact cause. In the Ferroli parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code A04 myself?
You can reset the appliance and check things like the water pressure or settings yourself. Work on gas-carrying parts must be left to a certified gas engineer.
All Ferroli boiler faults and codes at a glance →