WRDB - GBMaintenance15Maintenance*If the probe malfunctions, proceed in the following man-ner:B Unscrew the probe fixing screw.B Detach the ignition unit terminal.B Replace the damaged part and proceed with itsassembly using the steps indicated in the previoustable, in reverse order.Operating check*To check the correct operation of the combustion gasprobe, proceed in the following manner:B Remove the combustion gases evacuation pipe.B Replace it with a pipe (approximately 50 cm long)blocked at one end.B The pipe must be routed vertically.B Turn on the heater at nominal power and with thetemperature selector adjusted to maximum tempera-ture.In these conditions, the heater must turn off twominutes afterwards, at most. Remove the pipe andreplace the evacuation pipe.* These procedures must be performed by a qualifiedinstaller.Danger: The user must never touch thedevice.