AWB fault code F 25
Fault code F 25 on an AWB boiler (including ThermoMaster) means: Flow temperature rising too quickly. See F 05. System resistance too high, bypass insufficient. 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 F 25 on an AWB boiler indicates: Flow temperature rising too quickly. See F 05. System resistance too high, bypass insufficient.
Applies to
AWB ThermoMaster, 3HR 24 035004, 3HR 24 P, 3HR 24T 035014, 3HR 28 035008, 3HR 28 P, 3HR 28 TP, 3HR 28T 035018.
Fault code F 25 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:
- F.25 on ThermoGrand, 45S, 65S: Safety shut-down: flue gas temperature too high.
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 € 32.67
- AWB fan gasket for e.g. ThermoMaster 3HR 24 A037526.20 € 9.15
- AWB ignition pin gasket set € 60.11
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 F 25 mean?
Flow temperature rising too quickly. See F 05. System resistance too high, bypass insufficient.
How do I fix fault code F 25 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 F 25?
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 F 25 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 →