13
21 Brightness (Standby Mode)
– brightness of thermostat’s backlight in standby mode. Du-
ring setting of thermostat, the screen is illuminated on 100% brightness; the screen will
fade to the percentage value defined here. This value can be changed between 0-100%.
22 Software version
– version number of the software (firmware) running on the thermostat.
It is a read-only value.
10. FAULT FINDING
Fault phenomena of thermostats and their possible solutions
1. The thermostat’s display is dark, it is not lit
a. Is there any change upon touching the thermostat’s turn-on button?
YES – The thermostat has turned on, there is nothing else to do.
NO – see next answer.
b. Is there a icon on the display?
YES – The child lock function is on. Turn off the child lock as described in the
instructions manual.
NO – see next answer.
c. Is the small circuit breaker of the heating circuit switched on?
NO – Switch it on.
YES – see next answer.
d. Is there any change after removing the thermostat’s front panel and trying to switch
it on again?
YES – The thermostat has switched on, the ribbon cable has pressed the front panel;
when replacing the front panel take care to insert the ribbon cable in the small gap on
the rear side.
NO – see next answer.
e. Is the front panel of the thermostat connected to the rear panel, i.e. is the ribbon
cable connected?
NO – Connect it.
YES – see next answer.
f.
Is it possible to measure voltage on the phase input of the thermostat’s built-in
relay?
NO – The thermostat does not receive power. Have the power supply of the affected
electrical circuit, the small circuit breakers, junction boxes and wires tested by an
electrician.
YES – see next answer.
g. Is there any visible abnormal change, such as sooting, or signs of injury or damage to
certain components, on the thermostat’s relay or front panel?
NO – The thermostat needs to be further examined, so please, send it to our central
brand shop or order our on-site troubleshooting and repair service.
YES – The device has likely been hit by electrical overvoltage and it should partly or
entirely be replaced. The thermostat needs further examination, so please, send it to
our central brand shop or order our on-site troubleshooting and repair service.