A.O. Smith fault code F03
Fault code F03 on an A.O. Smith water heater (including Innovo) means: Air pressure switch fault: Damaged wiring/closed circuit. 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 F03 on an A.O. Smith water heater indicates: Air pressure switch fault: Damaged wiring/closed circuit.
Applies to
A.O. Smith Innovo, IR 12-160, IR 12-200, IR 20-160, IR 20-200, IR 24-245, IR 24-285, IR 32-245, IR 32-285.
Fault code F03 on other A.O. Smith series
The same code does not mean the same thing on every series. Check the rating plate to see which series you have:
- F03 on Innovo, IR 12-160, IR 12-200, IR 20-160, IR 20-200, IR 24-245: Air pressure switch fault: Air pressure switch defective.
- F03 on Innovo, IR 12-160, IR 12-200, IR 20-160, IR 20-200, IR 24-245: Air pressure switch fault: The tubes are damaged.
- F03 on Innovo, IR 12-160, IR 12-200, IR 20-160, IR 20-200, IR 24-245: Air pressure switch fault: The wiring is damaged.
- F03 on Innovo, IR 12-160, IR 12-200, IR 20-160, IR 20-200, IR 24-245: Air pressure switch fault: Air leak between the venturi and the flexible air connection.
- F03 on Innovo, IR 12-160, IR 12-200, IR 20-160, IR 20-200, IR 24-245: Air pressure switch fault: The non-return valve between the fan and the burner is stuck.
- F03 on Innovo, IR 12-160, IR 12-200, IR 20-160, IR 20-200, IR 24-245: Insufficient pressure difference in the air pressure switch, caused by: - the air supply and flue gas discharge system - faulty condensate drain - dirty burner - blocked heat exchanger.
- F03 on Innovo, IR 12-160: Air pressure switch fault: Air pressure switch fault: Damaged wiring/closed circuit.
- F03 on BFC, 100, 120, 28, 30, 50: The pressure switch is not working correctly: Broken cable / open circuit.
- F03 on BFC, 100, 120, 28, 30, 50: The pressure switch is not working correctly: Pressure switch does not close.
Matching parts
A.O. Smith parts are available from Instalpunt; shipping to EU countries from €17.95 (€24.95 for more distant countries), usually 3–5 working days.
For fault code F03, the part involved is usually in the category: fan.
This message does not point directly to one faulty part. These are the parts that most often fit this appliance:
- A.O. Smith ionisation pin after September 2009 € 41.82
- A.O. Smith glow plug for e.g. Innovo IR32-380L 0311990(S) € 92.78
- A.O. Smith fan adapter € 98.01
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 A.O. Smith water heater fault code F03 mean?
Air pressure switch fault: Damaged wiring/closed circuit.
How do I fix fault code F03 on an A.O. Smith water heater?
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 A.O. Smith fault code F03?
That depends on the exact cause. In the A.O. Smith parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code F03 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 A.O. Smith water heater faults and codes at a glance →