The Networker wall controller is found on a number of ducted air conditioning & gas heater systems.
If there is a fault with the system a flashing spanner is displayed on the screen and a code will scroll across the top of the display approximately every 2 minutes. It is important to make note of this code.
Resetting the system is a simple as pushing 'reset' which is button number 4. The following video demonstrates how to reset faults on your Networker thermostat.