Vaillant TURBOmax VUW 242 E Service Manual download pdf (Page 29)

Fault Finding 10

Instructions for Installation and Servicing turboMAX pro R3 29

To reset the appliance after a lockout (either burner

lockout illuminated or any other indicator light flas-

hing), turn the central heating control to the reset positi-

on and release.

10.2 Logical fault finding procedure

Preliminary Checks

These checks must be carried out before attempting to

use the fault finding guide:

1) Carry out electrical safety checks.

2)Check that the external electricity supply to the boiler

is on, and a supply of 230 V~ is present

between boiler terminals „L“ and „N“.

3)Check that gas supply to the boiler is on and that it

has been correctly purged.

4)Ensure the heating system is full of water and charged

to approx. 1 bar. If not refill the system and vent

system. Ensure boiler flow and return service valves

are open.

5)Check that boiler main on/off control is set to position

(I)

6)Ensure that the Maximum Radiator Temperature and

Maximum Hot Water Temperature controls are set to

high position.

7)Check that all the external controls are on and calling

for heat (if no external controls are fitted, boiler termi-

nals 3 and 4 must be linked). Check that boiler anti-

cycling „economiser“ control is not engaged.

Procedure

Note!

Always check the operation of the boiler for

central heating first before checking hot water

operation. Do not open a hot tap unless

instructed to by the fault finding guide.

10 Fault Finding

10.1 Introduction

The turboMAX pro has built in diagnostic indicator lights

to assist you with fault finding in the unlikely event of a

boiler malfunction. The lights will illuminate in sequence,

indicating the operational status of the boiler. Should a

fault develop in the boiler the indicators may flash high-

lighting the possible fault e.g.

Power on indicator (green)

Illuminates when the electricity supply to the boiler is

on, the main on/off control is set to position (I) and the

internal boiler fuses are o.k.

(A flashing indicator shows that the overheat thermost-

at has cut out.)

Hot water demand indicator (yellow)

Illuminates whenever there is a demand for hot water

i.e. a hot water tap is opened.

Central heating demand indicator (yellow)

Illuminates whenever there is a demand for central hea-

ting i.e. the radiator temperature control is turned on

and the external heating controls are calling for heat.

Note!

If the external controls are not calling for heat

(i.e. the room thermostat has reached

temperature) this indicator will go out. This is

perfectly normal.

Fan operation indicator (yellow)

Illuminates to indicate that the fan is operating and has

been checked by the fan pressure switch.

(A flashing indicator shows that the air pressure switch

has not made.)

Ignition indicator (yellow)

Illuminates when gas valve, operator and ignition trans-

former are energised. This indicator remains on during

burner operation.

(A flashing indicator shows lack of water or poor water

circulation in central heating system.)

Flame indicator (yellow)

Illuminates when flame is recognised by the flame moni-

toring system.

(A flashing indicator shows that an NTC sensor is bro-

ken, not connected or shorted to earth.)

Burner lockout indicator (red)

Illuminates if the burner fails to light within 10 seconds

of illumination of the ignition indicator after the 3rd igni-

tion cycle.

(A flashing indicator shows a failure in the electronic

boards.)

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