HDS Middle Range / HDS Premium Range Basic Settings and Service ProceduresService Manual 04.2008 Page 89 / 127Exhaust thermostat has trippedDisplay NoteExplanationCable break or short circuit in temperature sensorClear soot from boilerCheck exhaust thermostatCheck temperature sensorFlame sensor did not detect a flame although theburner was switched onClean inspection glassCheck fuel supplyFlame sensor detected light, although the burner wasoffExternal incident light at the flamesensorScale in combustion chamberSolenoid valve does not closeRFID read-write electronics are defective. Check RFID read-write electro-nics, replaceCable break has occurred in fuel level sensor Check fuel level sensorCable break has occurred in cleaning agent 1 levelsensor Check RM1 level sensorCable break has occurred in cleaning agent 2 levelsensor Check RM2 level sensorSoftware version 1.1This is not a fault.Error appears fordesign reasons only becausethe display is in Error menu.113.2.10 Operating hours„Control ON“ operating timeDisplay NoteExplanation75 °C12 544h3.2.9 Fault memory70 °C
