AWB fault code F3
Fault code F3 on an AWB boiler (including ThermoElegance) means: No tacho signal, wiring faulty, cabling / fan ignition, fan defective. 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 F3 on an AWB boiler indicates: No tacho signal, wiring faulty, cabling / fan ignition, fan defective.
Fixing fault code F3: step by step
- Check that the gas valve at the appliance is open and that other gas appliances, such as the hob, are getting gas.
- Check that the condensate trap under the appliance is filled and clean; a blocked condensate drain can make the boiler lock out.
- Check outside that the air intake and flue are clear (leaves, a nest, ice or snow).
- Reset the appliance once. If the code comes straight back, do not keep resetting it.
- If the fault keeps returning, the ignition or ionisation electrode is usually worn or dirty. It sits in the sealed combustion section: have it replaced by a qualified heating engineer.
Applies to
AWB ThermoElegance, HR 35 ST.
Fault code F3 on other AWB series
The same code does not mean the same thing on every series. Check the rating plate to see which series you have:
- F3 on ThermoBasic, ThermoMaster, 24.23 WT, VR 23.29 WT, VR 23T: The heating water temperature is above 95 degrees.
- F3 on ThermoElegance, 3, 4: No tacho signal.
Matching parts
AWB 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:
- AWB ignition transformer € 33.98
- AWB burner gasket € 8.15
- AWB ignition electrode seal € 16.31
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 AWB boiler fault code F3 mean?
No tacho signal, wiring faulty, cabling / fan ignition, fan defective.
How do I fix fault code F3 on an AWB 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 AWB fault code F3?
That depends on the exact cause. In the AWB parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code F3 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 AWB boiler faults and codes at a glance →