Code and description Cause Measure
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
S11 (blocking error)
Short circuit in
temperature sensor T
2
at
the bottom of the tank.
Short circuit in sensor circuit Replace the cable and/or sensor.
S12 (blocking error)
Short circuit in sensor 1 of
temperature sensor T
1
at
top of tank
(1)
Short circuit in sensor circuit Replace the cable and/or sensor.
S13 (blocking error)
Short circuit in sensor 2 of
temperature sensor T
1
at
the top of the tank
(1)
.
Short circuit in sensor circuit Replace the cable and/or sensor.
S14 (blocking error)
Short circuit from
dummy 1
Short circuit in sensor circuit Replace the cable dummy sensor
(2)
.
S15 (blocking error)
Short circuit from
dummy 2
Short circuit in sensor circuit Replace the cable dummy sensor
(2)
.
F01 (blocking error)
Defect in power supply
circuit
Live and neutral connected wrong way
around.
Be sure to
connect the live and neutral
correctly (see section 7.7); the water heater
is phase-sensitive
Condensation on the flame probe Disconnect the lead at the flame probe
Ignite the water heater three times, with
an interrupted ionisation circuit
Reconnect the ionisation lead to the
flame probe
Ignite the water heater again
The repeated ignition attempts will have
caused the condensation to evaporate
•
•
•
•
•
Floating neutral Install an isolating transformer (see section
7.7.3.1)
92 Installation, Maintenance and Service part
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