A.O. Smith BFC - 30, BFC - 60 Code + Description Cause Solution Remark E01 blocking error

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Code + Description	Cause	Solution		Remark
E01 (blocking error)	The temperature of the	None. This is a temporary message that may appear from time to
	water at the top of the	time, but will disappear automatically.
The temperature	tank is > 85 oC.
protection at the top of
the tank has been
activated.
E03 (lock-out error)	The two temperature	1.	Check sensor position and wiring.	To replace the necessary parts, you must contact your installation
Error in temperature	sensors in the tank	2.	If necessary, reset the electronic controller. Replace the sensor	engineer
	detect a differential of >		if the error persists.
sensor T at the top of	10 oC over a period of
the tank.1	at least 60 seconds.
E04 (lock-out error)	The two dummy	1.	Check leads from dummy 1 and dummy 2.	To replace the necessary parts, you must contact your installation
	sensors in the tank	2.	If necessary, reset the electronic controller. Replace the dummy	engineer
Error in dummy	detect a differential of >
sensor(2).	10 oC over a period of		sensor if the error persists.
	at least 60 seconds.

1) Temperature sensor T1 is a '2 in 1' sensor, T1 contains 2 NTCs for the high-limit thermostat and safety thermostat protection.

(2) The dummy sensor / flue gas sensor comprises dummy sensor / flue gas sensor 1 and dummy sensor / flue gas sensor 2.

Instruction manual BFC 81