Vaillant COMBlcompact VCW 242E Manuale utente

Vaillant Training/Logical Fault Finding Guide for all

COMBlcompact and THERMOcompact models

~Vaillant

HEATING,CONTROLS,HOTWATER.

tWJVaillanl

HEATING,CONTROLS,HOTWATER.

Contents

Guidance Notes

IICD

l' ."...

Room Sealed Fan Flued Models (RSF)

COMBlcompact

VCW 242E, 282E

THERMOcompact

VC112E, 142E, 182E,242E, 282E Ii)

)r:-'

'-:14

Balanced Flue & Open Flue Models

COMBlcompact

VCW221, 240, 280

THERMOcompact

VC110, 180, 240, 221.

t¥JVaillant

HEATING,CONTROLS,HOTWATER. [!]

Guidance Notes (should be read before using this fault finding guide)

1. Check you are using correct guide for your appliance.

See index and check model number.

2.Always start at the beginning of guide and work

through one step at a time.

3.AII guides deal with central heating (C/htg) first, then

hot water (D.HW.)

Do the same when following guides.

4. When checking 240v AC mains voltage use terminal 1

on appliance terminal strip as the neutral test point.

~5. When checking D.C. voltage use terminal 9 on

appliance terminal strip as the negative test point.

(All D.C. voltages are low voltage).

Note 1 It is law* that any work carried out on a gas

appliance must be carried out by a competent person

who is registered with CORGI (Council for Registered

Gas Installers).

Note 2 All work involving electricity must be carried

out by a competent person who is responsible for

electrical safety checks.

*Gas Safety (Installations and Use) Regulations 1984

Gas Safety (Installations and Use) Amendment

Regulation 1990

6.ln order to use this fault finding guide ensure that the

operating mode of circulating pump is set to operating

mode (I) (selector plug adjacent to appliance terminal

strip makes electrical connection to contact one) see

diagram.

TIISI

0Gro GroG

7. Note that illustrations and pictures are shown only

once and are not duplicated again in this guide.

Each illustration/picture has been given a reference

number.

FRONT CONTROL PANEL

Key

1. Yellow neon indicating power to operator.

2. Green neon indicating operation of Diaphragm pump.

As voltage decreases to diaphragm pump so neon loses

luminosity.

3. 0.16 amp anti surge fuse.

4. Time delay adjustment (factory set 5 minutes,

adjustable 1-12 minutes).

5. Fault suppression button (ignition lockout).

6. Indicating neon (lockout).

7. 2 x 2 amp fuses (L&N).

8. Variable potentiometer controlling central heating flow

temperature only.

9. Red neon rocker switch for power on.

10. Central heating rocker switch (not fitted on VC

appliances) .

t¥JVaillanl

HEATING,CONTROLS,HOTWATER.

Room Sealed Fan Flued Models (RSF)

guidance note 6)

YES

~....

f...l

YES

...

~Vaillant

HEATING,CONTROLS,HOTWATER.

[!]

delay (isolate power, wait 5

seconds and restore).

(d) Check anti surge fuse

(0.16 amp).

...

Inoe. pU\pPrun1

YES

[Go ill 4

Check hydraulic operation OK ?

1. Hydraulic diverter valve

moves leftcloses microswitch

M2 (VCWonly)

2. Differential valve opens.

TPic14

[Goto 5

I',

tiJVaillanl

HEATING, CONTROLS,HOTWATER.

~NO" (a) Check 240vACacross

pump terminals

TPic10

(b) Check pump free to rotate

and not stuck

TPic11

Itv

If(a) and (b) are OK.- change

pump.

I~NO

(a) Check appliance and

system full, pressurised and

vented of air.

(b) Check servo valve is in

C/htg position, return spring

holds carn down (VCW

only).

flux or inhibitorcausTng

frothing in system

affecting:-

1. Pump performance

2. Hydraulic diverter valve

(VCW only)

3. Servo valve (VCW only)

4. Connecting tubes

5. Main heat exchanger

6. Differential valve

Pic12

OPEN G

Rear view

Does applianC1

ignition?

(yellow neon glowing front

control box)

YES

~Vaillant

HEATING,CONTROLS,HOTWATER. ~

I~O~ (a) Check microswitchM2

(20v DC)is makingcontact

and closed circuit(VCW

only).

(d) Checkcombustion

chamber seals.

(e) Cneck air

switcn"tubes

kinkedand Sl

., top cover plate clear.

Pic15

(b) Check fan pressure

switch oper9tes (240v AC

:fromboth sides of switch to

neutral terminal 1) ifnot

check C to F

TPic16

-Joints correctly located

- Flue not blocke(

- Terminal position

(1)Check fan working

correctly.

Ifall above OK change fan

pressure switch.

Does burner light and

remain alight?

YES

~Vaillant

HEATING,CONTROLS,HOTWATER.

~NO~ N;B. For lockoat (Black

button & Red Neon)

problems when no flame is

visible check A to F.

\)~rnenflame is visible prior

to lockout checkFto H only

(a). Check gas supply to

appliance live and purged.

(b). Check differential valve

open (if no return to Q4).

(c). Check20v DC across

gas operator, if available

but operator fails to open

(audible click) change

operator.

(d). Check central heating'

overheat thermostat and

connection (should be

closed circuit, if open

change component).

T b " Pic22

YES

Goto 8

~fjJ

YES

~Vaillant

HEATING,CONTROLS,HOTWATER.

I~O~ (a) Check standing and

working gas pressure at

appliance inlet.

TPic25

diaphragm pump (approx 6v

DC) withNTC disconnected.

TPic27

(b) Check diaphragm pump

operating tubes and throttle

jet clear.

TPic26

NO~ (a) TestNTC/Elebtronic

board.

Pull off NTC wire (from

D.H.W. overheat) touch it

on chassis, if burner goes

off, change NTC.

TPic29

(d) Check burner pressure

settings low and high fire rate.

TPic28

(e) Check and/or replace gas

operator.

If burner stays on change

electronic board.

(The gas operator may be

stuck open eg debris. This

symptom is very unlikely

but can be checked by

pulling offthe wire to

operator. Ifburner remains

alight then change

operator).

~Vaillant

HEATING,CONTROLS,HOTWATER.

(a) Check demand for hot

water-tap open and supply

pipes correct way round.

(b) Check water section

moves servo valve cam - if

not check venturi/diaphragm

of water section.

~o~

YES

Pic 30

(20v DC) is making contact

and closed circuit.

.. Pic31

(d) Check hy

valve moves

microswitch r

open no eTec

through switch).

CLOSED ~

(e) If D

check gas -

pressure at

& burner pr'

Pic 25 & Pic 28.

(1) If water fl<

insufficientc 0

adequate cold water mainO,

supply and/or blockage in

water section or DHW

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