Vaillant TURBOmax VUW 242 E Service Manual download pdf (Page 33)

Fault Finding 10

Instructions for Installation and Servicing turboMAX pro R3 33

Does fan run after approx. 30 secs.?

Check flue and ignition system

Check pitot tube (in fan outlet) and air

hoses are not obstructed and correctly

aligned.

Check or replace air pressure switch.

Does the fan run now?

Is 230 VAC present across fan

terminals?

Replace electronic board

Yes

Yes Check/replace fan

Does the boiler

commence ignition

Check air/flue gas system

is correctly fitted and not

obstructed

Yes

Replace electronic board

Yes

Are electrodes sparking at

the burner?

Yes Go to sheet E

Check electrodes and

electrode leads.

Replace as necessary.

Sheet D

Does yellow fan operation

indicator glow?

Does yellow fan

operation indicator flash?

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Vaillant TURBOmax VUW 242 E Service Manual Page 33