Appendix
0020237057_01 Installation instructions 39
D.2 Troubleshooting
Symptom Possible cause Measure
Display remains dark The batteries are flat ▶ Change all the batteries (→ Operating instructions, "Changing
the batteries").
The batteries in the system con-
trol have not been inserted cor-
rectly
▶ Insert the batteries in the battery compartment, making sure
that the poles are the right way round.
The product is defective ▶ Replace the product.
No changes in the display when
the rotary knob is turned
Software error 1. Take all the batteries out.
2. Insert the batteries in the battery compartment, making sure
that the poles are the right way round.
The product is defective ▶ Replace the product.
No changes in the display
via the selection buttons are
pressed
Software error 1. Take all the batteries out.
2. Insert the batteries in the battery compartment, making sure
that the poles are the right way round.
The product is defective ▶ Replace the product.
Heat generator continues to
heat once the room temperature
has been reached
Incorrect value in the Room
temp. mod. or Zone assign-
ment function
1. Set Thermost. or Temp. mod. in the Room temp. mod.
function (→ Page 17).
2. In the zone in which the system control is installed, as-
sign the system control's address in Zone assignment
(→ Page 18).
The reception strength is too
weak
▶ If the reception strength is ≤ 4, find a new installation site for
the system control.
The heating installation remains
in domestic hot water mode
Heat generator cannot reach
the max. target flow temperat-
ure
▶ Set a lower value in the Max.DHW fl.targ.temp. function
(→ Page 20).
Only one of several heating
circuits is displayed
Heating circuits inactive ▶ Activate the required heating circuit by defining the functional-
ity in the Type of circuit function (→ Page 15).
Only one of several zones is
displayed
Heating circuits inactive ▶ Activate the required heating circuit by defining the functional-
ity in the Type of circuit function (→ Page 15).
Zone deactivated ▶ Activate the required zone by setting the value to Yes in the
Zone activated function (→ Page 18).
Display view: Clean outside
temperature sensor
The battery in the outdoor tem-
perature sensor is flat
▶ Clean the solar cell of the outdoor temperature sensor (→
Operating instructions, "Cleaning the outdoor temperature
sensor").
The reception strength of the
outdoor temperature sensor is
weak or non-existent
▶ If the reception strength is ≤ 4, find a new installation site for
the outdoor temperature sensor.
The product is defective ▶ Replace the product.
Display view: No RF commu-
nication
No power supply to the radio
receiver unit
▶ Reconnect the power supply to the radio receiver unit.
The system control is outside
the radio reception range
1. Take the system control to the radio receiver unit and see if
the reception strength increases.
2. If the reception strength is ≤ 4, find a new installation site for
the system control.
The product is defective ▶ Replace the product.
It is not possible to switch to the
installer level
You do not know the code for
the installer level
▶ Reset the system control to the factory settings (→ Page 11).
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