A.O. Smith BTH 300 Instruction Manual page 61

FAULT AND ALERT MESSAGES (CONT)
POSSIBLE CAUSES - CHECK/REPAIR
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DISPLAYED FAULT/ALERT MESSAGE
Blocked Air Intake
0 days 0 hr 0 min ago
Error Code: A7-1201
Restriction in air intake.
Check intake pipe and
termination for blockage.
Press the Advanced button for
High Temp Limit Exceeded
0 days 0 hr 0 min ago
Error Code: A5 - 401
Energy Cut Off has shut off
water heater due to high tank
temperature.
Press the Advanced button for
No Water
0 days 0 hr 0 min ago
Error Code: D6 -8
No water detected by Powered
Anode.
The control indicates a problem
with the anode protection. By
ACCEPT
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