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

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Indication Cause Measure
Insufficient or no hot
water The water heater is off. Turn on the water heater (see section 4.1).
There is no supply voltage. Make sure that:
the control switch is set to I.
the isolator is in ON position.
there is power on the isolator.
there is power to the electrical connector
block.
The measured voltage must be
230 V
AC
(-15%, +10%).
•
•
•
•
The hot water supply is used up. Reduce the hot water consumption. Wait
until the water heater heats up.
The controller is in the OFF mode. Set the controller in the ON mode.
The temperature (T
set
) is set too low. Set the temperature (T
set
) to a higher value.
Glycol leakage Leakage from a fluid connection
(threaded) Tighten the threaded connection.
Leakage from a component Tighten component joints
Any defective components must be
replaced 1.
2.
Leakage from solar heating system Consult the supplier and/or manufacturer
11.1.2 Displayed errors
Note
For the coding of the connections, refer to the Electrical wiring diagram.
Note
Contact your service and maintenance engineer if the error persists.
Code and description Cause Measure
S01 (blocking error)
Open circuit from
temperature sensor T
2
at
the bottom of the tank.
Sensor is not (correctly) connected Connect the sensor lead to JP3
Damaged cable and/or defective sensor Replace the cable and/or sensor
S02 (blocking error)
Open circuit from sensor 1
of temperature sensor T
1
at the top of tank
(1).
Sensor is not (correctly) connected Connect the sensor lead to JP5
Damaged cable and/or defective sensor Replace the cable and/or sensor
S03 (blocking error)
Open circuit in sensor 2 of
temperature sensor T
1
at
the top of the tank
(1)
.
Sensor is not (correctly) connected Connect the sensor lead to JP5
Damaged cable and/or defective sensor Replace the cable and/or sensor
S04 (blocking error)
Open circuit from
dummy 1. Dummy is not (correctly) connected Connect the dummy sensor (dummy sensor
1 and 2) leads to JP4.
Defective dummy Replace the dummy sensor
S05 (blocking error)
Open circuit from
dummy 2 Dummy is not (correctly) connected Connect the dummy sensor (dummy sensor
1 and 2) leads to JP4.
Defective dummy Replace the dummy sensor
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