To clear the error code, wait 5 minutes and then press and hold the appropriate button (ON / OFF on the white remote, "Home" symbol on the black remote). The heater will then switch to cooling mode. Once the cooling cycle is complete (smoke extractor switched off), open the combustion chamber and clean the grates properly after removing the vermiculite ring and flame modeller. Be sure to remove (vacuum) all the ashes and any pellets. Replace the flame modeller and vermiculite ring. Lock the glass door and carry out another test run. If the stove is operating correctly again, without any error codes, make sure you remove the ashes more regularly (always when cold). If the problem persists, contact your installer.