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12 - USE
12.18.2 - Diagnostics: "E" blocking errors (continued)
Blocking
"E"
description
Code
U8 return temperature
E14
sensor short-circuited
U4 outside sensor short-
E15
circuited
Erroneous temperature
E16
reading.
U3 cold water temperature
E17
or storage tank sensor
circuit shorted
U6 boiler temperature
E18
sensor circuit shorted
E2prom memory damaged
E19
Flame presence with gas
E20
valve closed
E21
Phase and neutral inverted
Electrical supply frequency
E22
other than 60Hz
Ground connection is
E23
absent
Erroneous temperature
E30
reading.
Erroneous temperature
E31
reading.
Erroneous temperature
E32
reading.
Erroneous temperature
E33
reading.
E42
Program error
Error in the boiler tY
E50
parameter selection
Reset button pressed too
E51
often in a short period time
Checks to make
Check that the electrical resistance of
the sensor corresponds with the graph in
section 13.13;
check that the electrical connection cables
between the sensor and the power control
board have continuity and carry current
Check that the electrical resistance of
the sensor corresponds with the graph in
section 13.14;
check that the electrical connection cables
between the sensor and the power control
board have continuity and carry current
Check that the electrical resistance of
the sensor corresponds with the graph in
section 13.13;
check that the electrical connection cables
between the sensor and the power control
board have continuity and carry current
Check that the electrical resistance of
the sensor corresponds with the graph in
section 13.13;
check that the electrical connection cables
between the sensor and the power control
board have continuity and carry current
Invert phase and neutral
Check the electrical frequency of the
system.
Check if CS parameter is at 03 (see
section 16)
Check if the boiler is properly grounded
Push ON switches 7 an set again the
correct tY value (see section 16).
Solutions
If the sensor resistance does not correspond, it must be
replaced;
if the electrical circuit is damaged, it must be repaired;
if the previous two cases do not apply, replace the power
control board
If the sensor resistance does not correspond, it must be
replaced;
if the electrical circuit is damaged, it must be repaired;
if the previous two cases do not apply, replace the power
control board
Replace the power control board
If the sensor resistance does not correspond, it must be
replaced;
if the electrical circuit is damaged, it must be repaired;
if the previous two cases do not apply, replace the power
control board
If the sensor resistance does not correspond, it must be
replaced;
if the electrical circuit is damaged, it must be repaired;
if the previous two cases do not apply, replace the power
control board
Replace the command and control board
Replace the gas valve
If phase and neutral are correctly wired, replace the power and
control board
If the electrical supply frequency is other than 60Hz, contact
the electric company;
if the mains frequency is 60Hz, replace the command and
control board.
Make sure that the CS parameter is at 03.
if the boiler is properly grounded, replace the power control
board
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
If tY value is correct, change the power control board
57
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