WEATHER COMPENSATION When the Weather Compensation option is fitted to the system then the central heating temperature knob (B) becomes a method of controlling room temperature. Turn the knob clockwise to increase room temperature and anticlockwise to decrease room temperature. Once the desired setting has been achieved, leave the knob in this position and the system will automatically achieve the desired room temperature for all outside weather conditions. BOILER FROST PROTECTION The boiler is fitted with frost protection that operates in all modes, provided the power supply to the boiler is always turned on. If the water in the boiler falls below C, the frost protection will activate and run the boiler to avoid freezing. The process does not guarantee that all other parts of the system will be protected. If a system frost thermostat has been installed, the boiler must beset in winter mode, ‘ ’, for the system frost protection to run. If no system frost protection is provided and frost is likely during a short absence from home it is recommended to leave the system heating controls or built in programmer (if fitted) switched on and run at a reduced temperature setting. For longer periods, the entire system should be drained. BOILER RESTART To restart the boiler, when directed in the listed fault messages see section 9) press Restart. The boiler will repeat its ignition sequence. If the boiler still fails to start consult a Gas Safe Registered Engineer or in IE a Registered Gas Installer (RGII). MAINS POWER OFF To remove all power to the boiler the mains power switch must be turned off.