Vaillant TURBOmax VUW 242 E Service Manual download pdf (Page 35)

Fault Finding 10

Instructions for Installation and Servicing turboMAX pro R3 35

Does flame indicator glow and

flames increase in size to full gas

rate after approx. 2 mins?

Yes

Does burner flame modulate/ go

out when radiator temperature

control is turned left to the

horizontal position at flow

temperature of approx. 50 C?

Yes

Does heating flow pipe

temperature rise?

Go to sheet GYe s

Check operation of burner and modulation

Ensure flow and return service

valves are open

Replace electronic board

Check operation of boiler in DHW

mode, does flame increase in size

to full rate?

Yes

Check partial load

setting

Go to sheet G

Yes

Check connections and

modulatior, replace gas valve if

burner still fails to increase to full

rate

Turn main ON/OFF control to

the "0" position

Yes

Insert a small screwdriver

through the hole in the front of

the diverter valve and hold

blade lightly against spindle

Turn "ON" the main ON/OFF

control

Does spindle move?

Yes

Replace electronic board

Replace diverter valve

Sheet F

Does yellow hot water

demand indicator glow?

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Vaillant TURBOmax VUW 242 E Service Manual Page 35

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