AWB fault code F65
Fault code F65 on an AWB boiler (including ThermoMaster) means: Temperature in main PCB too high Electronics heated excessively from outside. Main PCB faulty. 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 F65 on an AWB boiler indicates: Temperature in main PCB too high Electronics heated excessively from outside. Main PCB faulty.
Fixing fault code F65: step by step
- Switch the appliance off at the mains for 30 seconds (unplug it), then switch it back on.
- Is it about communication with the thermostat? Then check the thermostat connection and wiring.
- Reset the appliance once. If the code comes straight back, do not keep resetting it.
- If the code comes back, the PCB or burner control unit is probably faulty. Have the appliance read out first to be sure.
Applies to
AWB ThermoMaster, CXV 35 A.
Fault code F65 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.65 on ThermoElegance, ThermoGrand, 25A/3, 45S, 65S: Electronics temperature fault.
- F65 on ThermoElegance, 3 A (N NL), 35A, 4 A (N NL) A/2, 4 SOLO A (N NL), 5 A (N NL): Defective main PCB.
- F65 on ThermoMaster, CXV 30 A: Temperature in main PCB 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 € 35.28
AWB fan gasket for e.g. ThermoMaster 3HR 24 A037526.20 € 9.88
AWB ignition pin gasket set € 64.92
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 F65 mean?
Temperature in main PCB too high Electronics heated excessively from outside. Main PCB faulty.
How do I fix fault code F65 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 F65?
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 F65 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 →