Fault diagnosis and rectification
Installation instructions geoTHERM 0020051574_04 107
11
11.6 Other errors/malfunctions
Malfunction sign Possible cause Solution
The auxiliary heating system does not work
even though it has been enabled by the
controller (e. g. during the switch-off time
by the power supply operator (energy sup-
ply company switch-off time)), the heating
system or the DHW tank do not reach the
desired temperature.
The auxiliary heating system is connected
on a low-rate tariff and this tariff has just
been blocked by the power supply operator.
> Check whether the auxiliary heating is
on a low-rate tariff and a power com-
pany blockage is in effect.
The auxiliary heating safety thermostat has
triggered.
> Release the safety thermostat by press-
ing the pushbutton.
Possible causes if the thermostat trips again:
Air in the heating system. Blocked dirt filter
in the return of the heating system.
> Bleeding heating circuit. Clean the
blocked dirt filters.
The heating pump has stopped or is running
too slowly.
> Check the heating pump and replace
if necessary.
Noise in the heating circuit. Air in the heating circuit. > Bleeding heating circuit.
Dirt in the heating circuit. > Flush the heating circuit.
Bivalent temperature incorrectly set. > Change the bivalent temperature
(Menu A3) ¬Tab.9.9.
Pump output of the external heating pump
has dropped or pump is faulty.
> Check functioning of the pump; replace
if necessary.
Traces of water under or next to the heat
pump.
The condensate drain is blocked. > Condensate inside the unit is collected
in the condensate pan and may be dis-
charged under the heat pump (not a
fault). Check the line insulation inside
the unit, and re-insulate if necessary in
order to reduce condensate formation.
Leaks in the heating circuit. > Check the heating circuit components
(pump, auxiliary heating system, pipes)
for leaks.
> If necessary, retighten the screw cou-
plings and replace the seals.
Outside temperature indicates -60ºC. Outside temperature sensor not connected
or faulty.
> Check outside temperature sensor.
Temperatures in the heating circuit too low
or too high.
Target room temperature not optimally set. > Change the target room temperature
(Menu
1, ¬ operating instructions).
Night set back temperature not optimally
set.
> Change the night set back temperature
(Menu
1, ¬ operating instructions).
Heating curve not optimally set. > Change the heating curve (Menu C2)
¬Tab.9.6
11.5 Other errors/malfunctions
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