A.O. Smith BFC-120, Installation, User And Service Manual

Page: 102 / 126

Code and description Cause Measure
E03 (lock-out error)
Error in temperature
sensor T
1
at the top of the
tank.
The two temperature sensors in the tank
detect a difference of > 10°C over a
period of at least 60 seconds. Check sensor position and wiring.
Reset the controller if necessary. Replace
the sensor if the error persists. 1.
2.
E04 (lock-out error)
Defect in the dummy
sensor
(2)
.
The two temperature sensors detect a
difference of >10 ºC over a period of at
least 60 seconds. Check the wiring of the dummy 1 and
dummy 2.
Reset the controller if necessary. Replace
the dummy sensor if the error persists. 1.
2.
11.1.3 Warnings
Note
For the coding of the connections, refer to the Electrical wiring diagram.
Indication Cause Remark
Maximum burning hours:
Service is required The actual burning hours have exceeded
the pre-set burning hours. The water heater operates, but displays this
warning.
Periodic maintenance is a part of the
Warranty. When you do not obey this
condition, the warranty will void.
Anode protection is not
working The cables between the potentiostat
and anodes are loose or have been
connected incorrectly.
The earth connection of the anodes is
loose.
The water heater is not filled with
water. •
•
•
Connect the wiring correctly and the
warning will disappear.
If the wiring is correct but the warning
remains, check that the earth connection
is good and whether the tank is filled with
water.
Note
The water heater is functioning, but there is
no anode protection for the tank.
1.
2.
n
Solar heating system
pump or Q/T sensor not
correctly connected Lead(s) loosened or incorrectly
connected Connect the pump or Q/T sensor properly
and the warning will disappear.
If correctly wired but the warning
remains, replace pump or sensor.
To replace the necessary parts, you must
contact your installation engineer
1.
2.
Q/T sensor not identified Identification failed Disconnect appliance and Solar Heat
Master briefly from the mains.
Check the wiring.
If disconnecting has not helped and the
wiring is okay, and the Q/T sensor still
isn't recognized, then the Q/T sensor or
the Solar Heat Master is defective. 1.
2.
3.
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102 Installation, Maintenance and Service part