Ferroli fault code F35
Fault code F35 on a Ferroli boiler (including MegaDens 3 122 / 222 / 322 and MegaDens 4 126 / 226 / 326) means: Frequency error. 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 F35 on a Ferroli boiler indicates: Frequency error.
Applies to
Ferroli MegaDens 3 122 / 222 / 322, MegaDens 4 126 / 226 / 326, MegaDens 4SHR 126, MegaDens 5 131 / 231 / 331, MegaDens 5SHR 131, -.
Fault code F35 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:
- F35 on BlueSense 4, BlueSense 5, 12/22/32: Water pressure too high 3 times in 1 hour (3x F40).
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. These are the parts that most often fit this appliance:
- Ferroli split pin automatic air vent pump Megadens/Domina € 5.89
- Ferroli inspection hatch gasket 27C € 9.81
- Ferroli holder glow plug/sight glass 3286150 € 9.81
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 F35 mean?
Frequency error.
How do I fix fault code F35 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 F35?
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 F35 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 →