~
Does applianC1
ignition?
T
~
(yellow neon glowing front
control box)
0
YES
~
~Vaillant
HEATING,CONTROLS,HOTWATER.
~
I~O~
(a) Check microswitchM2
(20v DC)is makingcontact
and closed circuit(VCW
only).
T
(d) Check combustion
chamber seals.
(e) Cneck air
switcn"tubes
kinkedand Sl
., top cover plate clear.
T
Pic 15
(b) Check fan pressure
switch oper9tes (240v AC
:from both sides of switch to
neutral terminal 1) ifnot
check C to F
T
Pic 16
(c) Check flue installation:
-Joints correctly located
- Flue not blocke(
- Terminal position
(1)Check fan working
correctly.
Ifall above OK change fan
pressure switch.
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