14
Troubleshooting
If you have difficulty with your Thermostat, try these suggestions.
Most problems can be corrected quickly and easily.
All models
Screen is blank Replace the batteries (T4 & T4R only).
Check the OpenTherm boiler has power (T4M only).
Contact installer.
Thermostat shows
Batteries have less than 10% power and need to be
replaced soon.
Thermostat is flashing
+
Batteries are critically low and need to be replaced
immediately - see ‘Changing the Batteries’.
Thermostat shows
but
the boiler does not switch
on.
The boiler cycles on and off as it controls the
temperature, and sometimes the
icon will be
displayed when the boiler has cycled off.
If the boiler doesn’t switch on after a long period of
time contact your installer
Heating system does not
respond to temperature
adjustments.
Make sure the set temperature is higher than the
actual room temperature.
Check the heating system is powered on.
Check the Receiver Box is powered and the
Thermostat has a wireless signal (T4R only).
Thermostat shows
The temperature sensor of your Thermostat
is faulty, contact your installer to repair
or replace the Thermostat.
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