Troubleshooting
18 Operating instructions ecoTEC plus 0020134822_01
5
5.2 Reading fault codes
If a fault develops in the boiler, the display shows a fault
code starting with "F...". A plain text display explains the
displayed fault code. Example for F.10 "Flow NTC short cir-
cuit". Fault codes have priority over all other displays. If a
fault occurs, the display no longer shows the current heat-
ing flow temperature. If multiple faults occur at the same
time, the display shows the corresponding fault codes for
two seconds each in sequence.
> If your boiler displays a fault code, contact your compe-
tent person.
5.3 Detecting and rectifying faults
If problems occur whilst operating your boiler, you can
carry out the following self-checks:
Problem Possible cause Solution
No hot water,
heating stays cold;
boiler does not start
Building gas isolator cock closed
Open building gas isolator cock (¬ sec-
tion 4.6.1)
Building power supply switched off Switch on building power supply
Mains switch on boiler switched off
Switch on the mains switch on the boiler
(¬ section 4.6.2)
The heating flow temperature is set too low or in the
"Heating off" position (¬ section 4.7.2) and/or the
hot water temperature is too low
Set the heating flow temperature to the
desired temperature (¬ section 4.7) and/or
set the domestic hot water temperature to the
desired temperature (¬ section 4.8)
Filling pressure of the heating installation too low
Top up the heating installation with water
(¬ section 4.6.4)
Air in the heating installation
Purge the radiators;
If the problem occurs again:
Contact your competent person
Ignition malfunction
Press the reset button;
If the problem occurs again:
Contact your competent person
(¬ section 5.5).
DHW mode without any prob-
lems;
Heating does not start
No heat requirement via the controller
Check the timer programme on the controller
and correct if necessary;
Check the room temperature and, if required,
correct the target room temperature
(¬section4.9; Controller operating instruc-
tions).
5.1 Detecting and rectifying faults
> If, after checking the points mentioned in Table 5.1, your
boiler still shows signs of a fault, contact your competent
person to eliminate the problem.
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