Vaillant TURBOmax Plus SERIES Instructions For Installation And Servicing

Contents

73FAULT FINDINGProcedureNote: Always check the operation ofthe boiler for central heating firstbefore checking hot water operation.Do not open a hot water tap unlessinstructed to do so by the fault findingguide (TURBOmax only).1. If a fault code is showing in theboiler display follow the faultfinding charts referring also to thefault code and diagnostic modetables.2. If the boiler is not functioningcorrectly and a fault code is notshowing in the boiler display fol-low the fault finding chartsreferring also to the status modetable.3. Note: If the boiler display iscompletely blank initially check thetwo fuses (Isolate the electricalsupply before checking the fuses,spare fuses are located on theinside of the control box rearcover).To access the various modes press thebuttons on the control panel asfollows:Please note: If no key is pressed forapprox. 4 minutes the display willautomatically change back to Normalmode.Logical fault findingprocedureThese checks must be carried outbefore attempting to use the fault fin-ding guide.1. Carry out electrical safety checks(See Section ‘Preliminary ElectricalChecks’).2. Check that the external electricitysupply to the boiler is on, and asupply of 230 V~ is presentbetween boiler terminals ‘L’ and‘N’.3. Check that the gas supply to theboiler is on, that it has beencorrectly purged and that an inletpressure of 20 mbar is available atthe gas valve. (See Section ‘GasSupply’).4. Ensure the heating system is full ofwater and charged to between 1and 1.5 bar. If not, refill and ventthe system. (See Section ‘Filling theheating system’).Ensure boiler flow and returnservice valves are open.5. Check that the main ON/OFF con-trol is set to the ‘ON’ position.6. Set the central heating temperatureto maximum.7. Set the domestic hot watertemperature to maximum(TURBOmax only).8. Check that all external controls areon and calling for heat (if, noexternal controls are fitted, boilerterminals 3 and 4 must be linked).Check that the boiler anti-cyclingeconomiser is not engaged.Mode To returnto Normal modeStatus mode Press „i“ button Press „i“ buttonDiagnostic mode Press the „i“ and „+“button simultaneouslyPress the „i“ and „+“button simultaneouslyTo displaythe required mode