PROBLEMS AND SOLUTIONS
There is no display
a) Check power supply to thermostat.
b) Check the thermostat is wired as the wiring diagram on the
back side of the thermostat.
Display ruptured
a) Display has been subjected to abuse with hard objects or
sudden force.
Display a black screen
a) If the display surface temperature is too high. Please note
whether there is a heater nearby and if so, remove.
Displays ER0 or ER1
a) ER0: Built-in sensor is damaged. Avoid damage to the
small black dot sensor which can be found behind the
temperature sensing window of the main thermostat
panel.
b) ER1: The system is set in dual Temperature Control mode
(ALL) and the external sensor is not connected or is
damaged.
Missing segments from numbers or letters on LCD
Check whether the steel plate has been deformed during
installation. If deformed, correct it.
Large deviation of measured temperature and the
actual temperature
a) The thermostat should be installed in a ventilated room
and never in direct contact with sunlight or localised
heaters.
b) Check terminal connections, including the sensor.
INSTALLATION
A: Hook B: Central fixing lug
1. Remove the bezel to start the installation by pushing the
bezel away from the main body of the thermostat
2. Pull outwards on the central fixing lug and at the same
time lift the whole body assembly so that the hooks on
the steel back plate can be released. The steel back plate
can then be removed
3. Screw the steel back plate into the back box but not too
tight to prevent deformation of the steel plate
4. Make the wire connections into the back of the
thermostat as shown in the H3 wire diagram
5. Align the four hooks and with a press down movement
click the main body of the thermostat back in position on
the steel back plate
6. Replace the bezel and the installation is complete
External
Sensor
A
A
A
B
A
