Vaillant TURBOmax VUW 242 E Service Manual download pdf (Page 30)

10 Fault Finding

Instructions for Installation and Servicing turboMAX pro R330

Ensure boiler main

ON/OFF control is set

to position "1"

Yes Go to sheet C

Check electrical supply, appliance fuses and on/off control

Is 230VAC present across

terminals L and N?

Yes

Is 230VAC present across

terminals 3 and 5?

Yes

Is voltage between

16-26 VDC present across

terminals 8 and 9?

Yes

Is 5 VDC present between

5V and GND test points

on electronic board?

Replace LCD display

Yes

NoRepair external fault

Is the continuity

across fuse F1?

Go to sheet B

Does ON/OFF knob

operate switch on

electronic board

Boiler ON/OFF control

defective,

change electronic

board

Replace switch

mechanism

Yes

Note 1:

For test purposes, disconnect

external controls from terminal

3 - 4 and replace with a bridge

between these terminals.

It appliance then operates, the

fault is with the external controls.

Sheet A

Is there continuity

across fuse F3?

Replace electronic

board

Check transformer

Replace if

necessary

Yes

Does green power on

indicator glow?

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Vaillant TURBOmax VUW 242 E Service Manual Page 30

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