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~
Check hydraulic operation
OK?
1. Hydraulic diverter valve
moves left closes
microswitch M2 (VCW only).
Refer to Pic 13.
or
2. Differential valve closes
microswitch M4 (VC's only)
T
Pic36
\.,
"
YES
~
Go to 5
tij Vaillant
HEATING,CONTROLS, H OTWATER.
[!]
NO"
(a) Check appliance and
system full, pressurised and
vented of air.
(b) Check servo valve is in
C/htg position, return spring
holds cam down (VCW
only). Refer to Pic 12.
(c) Check differential valve
and tubes.
(d) Check for dirt, flux
sludge or inhibitor in system
causing frothing affecting :-
1. Pump performance.
2. Hydraulic diverter valve
(VCWonly).
3. Servo valve (VCW only)
4. Connecting tubes.
5. Main heat exchanger.
6. Differential valve.
I
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