Vallox 121 SE Series Operating, Maintenance And Technical Instructions

Contents

Vallox 121 SE Series Operating, Maintenance And Technical Instructions Manual pdf 8 page image

8 © VALLOX • We reserve the right to make changes without prior notice.What the units include can vary depending on the sales area.Vallox121SESymptom Cause Do this1 Outdoor air coming to thedwelling is cold.• Air cools down in the attic ducts.• The heat recovery cell is frozen, which is why extract aircannot heat outdoor air.• The post-heating radiator does not work.• The extract air filter or cell is clogged.• The initial adjustment of ventilation has not been done.• Check the insulation of the attic ducts.• Check the cleanliness of the filters and heat recovery cell.2 The maintenance remindersymbol ( ) is displayedand the unit operatesotherwise normally.• The maintenance reminder lights up the maintenancereminder symbol in the main display of the control panel atan interval of circa 4 months (factory setting).• You may change the interval (see the operating instructionsfor control panel, Section 3.2).• Check the cleanliness of the filters and the unit. If needed, clean orreplace the filters. Also check the external grille.• Reset the maintenance reminder symbol (see the operatinginstructions for control panel, Section 3.1.).3 “Exh air sensor faulty”message is displayed andthe unit is stopped.• There is a fault in the freezing protection sensor. • Contact a maintenance company. Sensor mounting needs to bechecked and the sensor has to be replaced if necessary.4 “Sup. air sensor faulty”message is displayed andthe unit is stopped.• There is a fault in the supply air sensor. • Contact a maintenance company. Sensor mounting needs to bechecked and the sensor has to be replaced if necessary.5 “Ind. air sensor faulty”message is displayed andthe unit is stopped.• There is a fault in the extract air sensor. • Contact a maintenance company. Sensor mounting needs to bechecked and the sensor has to be replaced if necessary.6 “Out. air sensor faulty”message is displayed andthe unit is stopped.• There is a fault in the outdoor air sensor. • Contact a maintenance company. Sensor mounting needs to bechecked and the sensor has to be replaced if necessary.7 “Cell sensor faulty”message is displayed andthe unit is stopped.• There is a fault in the sensor of the heat recovery cell. • Contact a maintenance company. Sensor mounting needs to bechecked and corrected if necessary.8 "Bus fault" message isdisplayed and the unitoperates at speed 1 (checkthe fan speed).• Wiring fault in the carbon dioxide sensor, in the controlpanel or in the humidity sensor, or the cable is of the wrongtype.• Contact a maintenance company. The connections have to bechecked and corrected if necessary.9 “Freezing alert” messageis displayed and the unit isstopped.• Antifreeze of the water-circulating radiator is active.NOTE! If there is no non-freezing solution in the water ofthe radiator, the radiator is at risk of freezing.(Does not apply to the Vallox 121 SE unit)• Immediately troubleshoot the situation. Consult a maintenancecompany to find out if there is any non-freezing solution in theradiator. Check if the circulation pump is broken, the boiler out ofoperation etc. The situation may pass by itself as soon as supply airtemperature exceeds 10 degrees, but do not wait till it happens.10 The desired automaticadjustment does not stayon.• There is a fault in the humidity or carbon dioxide sensor.One of the sensors is broken or missing.• Contact a maintenance company. Sensor mounting and connectionshave to be checked. (Sensors are options.)11 The fans are not runningand no indicator light is litat the control panel.• Door switch may be broken or the door is not quite closed.• The unit is out of power, for instance because a fuse hasblown.• The glass tube fuse (located in the control card behind aprotecting plate) protecting the electronics inside the unitmay have blown.• Check the door switch and fuses. The unit has a T800 mA glass-tubefuse.• If needed, contact a maintenance company (for instance to checkthe glass tube fuse).12 The unit does not obey thecontrol panel.• Disconnect the plug of the unit from the wall socket, wait for 30seconds and put the plug back. If this does not help, contact amaintenance company.13 “Carbon dioxide alarm”message is displayed andthe unit is stopped.• Carbon dioxide alarm. Carbon dioxide content hasexceeded 5000 PPM for two minutes. May be caused byfor instance a fire.• If there is a fire, take the necessary steps.• You can make the unit operational by disconnecting the plug fromthe wall socket, waiting for 30 seconds and putting the plug back.14 Filter guard symbol( ) is displayed and theunit operatesotherwise normally.• The pressure in the filter guard (pressure difference switch)has risen above the adjustment value or speed is 7 or 8(option).• Check the cleanliness of the filters and the unit. If needed, clean orreplace the filters. Also check the external grille.TroubleshootingMAINTENANCE INSTRUCTIONS