A.O. Smith fault code F19
Fault code F19 on an A.O. Smith water heater (including BFC) means: Supply voltage too low. 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 F19 on an A.O. Smith water heater indicates: Supply voltage too low.
Applies to
A.O. Smith BFC, 100, 120, 28, 30, 50, 60, 80.
Fault code F19 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:
- F19 on Innovo, IR 12-160, IR 12-200, IR 20-160, IR 20-200, IR 24-245: There is insufficient or excessive supply voltage for 60 seconds. The measured voltage between phase and neutral must be 230 VAC (-15%, +10%). The supply voltage between phase and neutral must be between 110 VAC and 230 VAC (-15%, +10%).
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.
This message does not point directly to one faulty part. If the code keeps coming back, view the A.O. Smith parts:
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 F19 mean?
Supply voltage too low.
How do I fix fault code F19 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 F19?
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 F19 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 →