A.O. Smith fault code XA5-XXXX
Fault code XA5-XXXX on an A.O. Smith water heater (including Twister) means: (Lockout) Temperature fault - The temperature limit has been exceeded: The temperature in the tank is above 95 ºC. 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 XA5-XXXX on an A.O. Smith water heater indicates: (Lockout) Temperature fault - The temperature limit has been exceeded: The temperature in the tank is above 95 ºC.
Fixing fault code XA5-XXXX: step by step
- Reset the appliance once; a one-off measuring error will then clear.
- Where you can reach it without opening the sealed combustion section, check that the sensor plug is seated firmly and the wiring is undamaged.
- If the code comes back, the sensor or its wiring is usually faulty (short or open circuit). Sensors in the sealed combustion section should be replaced by a qualified heating engineer.
Applies to
A.O. Smith Twister, TWI 35-200, TWI 45-200.
Matching parts
A.O. Smith 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:
- A.O. Smith air pressure switch Twister 45-190 € 48.93
- A.O. Smith fuse 5x20 2AT 250V € 16.31
- A.O. Smith 3-way fused terminal block € 27.18
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 XA5-XXXX mean?
(Lockout) Temperature fault - The temperature limit has been exceeded: The temperature in the tank is above 95 ºC..
How do I fix fault code XA5-XXXX 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 XA5-XXXX?
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 XA5-XXXX 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 →