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A. O. Smith water heater error 4 flashes
Over-temperature shutdown. The water got too hot and the safety limit has tripped.
Serious · needs a technician
4 flashes
Meaning: Over-temperature shutdown
What causes 4 flashes
The water got too hot and the safety limit has tripped.
What to do
Turn the gas control to Off. The gas control valve needs replacing.
Can I fix it myself?
No. This is a fault a technician should handle; keep using the appliance and it can get worse or become unsafe.
If the code comes back
Book a visit and add the code to the booking. A technician arrives knowing which parts to bring, diagnoses the water heater for a flat $89 and gives you an exact quote before doing any work.
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