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t¥J Vaillant
HEATING,CONTROLS, H OTWATER.
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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).
10
5
6
1
Q
7
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.
T
IISI
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.
9
3
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) .
4
2
8
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