Vaillant COMBlcompact VCW 242E Troubleshooting Manual page 12

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Does red neon glow in
main switch?
+
YES
t
Go to 3
~
Does pump run?
+
YES
t
Go to 4
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Vaillant
HEATING,CONTROLS, H OTWATER.
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I
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(a) Check 240v AC across
terminals 2 (L) and 1 (N)
Refer to Pic 1.
(b) Check 2 x 2 amp
appliance fuses.
Refer to Pic 2.
(c) Check 3 amp spur fuse.
If fuses OK and power
available but neon fails to
light, replace front Mother
Board.
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(a) Check 240v AC across
pump terminals (if not check
C to F).
Refer to Pic 10.
(b) Check pump free to
rotate and not stuck - If A &
B are OK change pump.
Refer to Pic 11.
(c) Check 240v AC available
for external controls at
terminal 3, if not change
Mother Board.
Refer to Pic 5.
(d) Check demand for
heating - external controls
on, and 240v AC back to
terminal 4.
(e) Check anti surge fuse
(O.16amp). Refer to Pic 4.
(f) Check safety isolating
transformer 240v AC
primary (black/grey) and
approx. 17v AC secondary
(brown/blue). Refer to Pic 9.
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