A.O. Smith SGS-28, Installation, User And Service Manual

Page: 101 / 126

Code and description Cause Measure
F11 (blocking error)
Flame detection with
closed gas control valve. Defective gas control valves See F07.
F18 (blocking error)
Communication error No power supply at solar controller Check that there is power to the solar
heating system controller
2. The measured voltage must be 230
VAC (-15%, +10%) •
•
No cable or damaged cable Check the wiring (communication cable)
between the main controller and the solar
heating system controller
If cable missing, connect the cable
If cable damaged, replace the cable •
•
•
Short circuit Q/T–sensor Check whether the Q/T-sensor is connected
correctly to the controller.
Disconnect the Q/T-sensor.
In case of disappearing communication
error, the Q/T-sensor must be replaced. •
•
F19 (blocking error)
Power supply voltage is
too low. There is not enough supply voltage. Check that there is power to the
controller
The measured voltage must be 230 VAC
(-15%, +10%) 1.
2.
C02 (lock out error)
Error message from the
controller. Incorrect reference voltage from the AD
converter. Reset controller.
Check that the frequency of the power
supply is compliant (see section 12.1). If
not, contact your installation engineer
If the frequency is correct but the error
persists, replace the controller. 1.
2.
3.
Internal error message
from the controller. EEPROM read error
50 Hz error
Internal communication error •
•
•
Internal error message
from the controller. Gas valve relay error
Safety relay error
Ignition relay error
RAM error
EEPROM error
EEPROM contents do not match the
software version
Processor software error •
•
•
•
•
•
•
C03 (blocking error)
Reset error Too many resets in too short a period Wait for the error to disappear (maximum 1
hour). If the error does not disappear,
replace the water heater controller.
C04 (blocking error)
Appliance selection error Incorrect water heater selection /
Incorrect selection resistor Check whether the correct water heater
is selected (see section 12.1).
If the correct water heater is selected, fit
the correct selection resistor.
If incorrect water heater selected, select
the correct one. 1.
2.
3.
C05 (blocking error)
Error message from the
solar controller Incorrect reference voltage from the
AD converter.
EEPROM error •
•
Reset controller.
Check that the frequency of the power
supply is compliant. If this is not the
case, contact your installation engineer.
If the frequency is correct but the error
persists, replace the solar controller. •
•
•
E01 (blocking error)
The temperature
protection at the top of
the tank has been
activated. The temperature of the water at the top
of the tank is > 88 ºC. None. This is a temporary message that
may appear from time to time, but will
disappear automatically.
0311753_SGS_28-120_II_UKUK_V2.0 , 2017-05-03 101