Vaillant aquaPLUS VUI 362-7 Service Manual download pdf (Page 48)

10 Fault finding

Instructions for installation and servicing aquaPLUS VUI 362-748

Draw hot water at high rate

Does flow indicator (tap)

on display light up?

Yes

Check hot water flow rate and temperature.

Compare with technical data, if flow is not

sufficient, check incoming main and cold water

filter.

Check cold water inlet pressure is

sufficient and that cold water inlet

filter is clear

Check cold water inlet is fully open

and adjustment is at maximum

flow rate

Does green warmstart

indicator flash now?

Check/Clear impeller in

Aquasensor, replace if necessary

Check/replace hall sensor

Replace electronic board

Does hot water indicator

glow/flash now?

Does green warmstart

indicator flash now?

Yes

Sheet GCheck D.H.W operation

Go to sheet B/C/E or F

Check DHW pump operation, is

230 VAC present across terminal

X601;

check/clear non return valve

and impeller on the pump;

replace the pump, if necessary

Is the boiler running?

Yes

Is the boiler running continously?

Yes

Normal operation carry out electrical safety checks

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Vaillant aquaPLUS VUI 362-7 Service Manual Page 48