Fault mode
|
67
6 720 644 143 (2010/09)
17.2 Faults that are shown on the display
Display
code
Description
Remedy
A7
Temperature sensor for hot water is
faulty.
(ZWB)
B
Check temperature sensor and lead for breaks or short
circuits, and replace if required.
B
Plug in boiler coding card correctly; replace if required.
A8
Communication fault.
B
Check BUS device connecting lead.
B
Check controller, replace if required.
Ad
Cylinder temperature sensor not
detected.
The cylinder temperature sensor was
recognised as a BUS subscriber and then
reconnected to the appropriate terminal.
B
Check cylinder temperature sensor and connecting
lead.
B
Resetting the Heatronic 3 to its standard settings
(
Æ
service function 8.E, page 49), resetting the IPM 1
or IPM 2 to its standard settings and carrying out the
automatic system configuration on the heating
controller.
b1
Code plug not detected.
B
Plug in boiler coding card correctly; replace if required.
b2/b3/
b4/b5/
b6
Internal data error.
B
Restore Heatronic 3 to standard settings (
Æ
service
function 8.E).
C6
Fan not running.
B
Check fan lead and connector, check fan, replace as
necessary.
CC
Outside temperature sensor not detected.
B
Check outside temperature sensor and connecting lead
for breaks.
B
Correctly connect outside temperature sensor to
terminals A and F.
d3
External temperature limiter faulty.
External limiter has tripped.
Temperature limiter locked out.
B
Check temperature limiter and lead for breaks or short
circuits, and replace if required.
B
Temperature limiter has tripped. Jumper across 8-9 or
PR-P0 is missing.
B
Reset the temperature limiter.
d5
External flow temperature sensor
defective (flow equaliser).
The external flow temperature sensor was
recognised as a BUS subscriber and then
reconnected to the appropriate terminal.
B
Check temperature sensor and lead for breaks or short
circuits, and replace if required.
B
Check whether only one temperature sensor is
connected; otherwise remove second temperature
sensor.
B
Resetting the Heatronic 3 to its standard settings
(
Æ
Service function 8.E: Reset all parameters),
resetting the IPM 1 or IPM2 to its standard settings and
carrying out the automatic system configuration on the
heating controller.
E2
Temperature sensor in CH flow faulty.
B
Check temperature sensor and lead for breaks or short
circuits, and replace if required.
Table 27 Faults shown on the display
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