53
Does yellow hot water
demand indicator ( ) glow?
Check hot water flow rate
and temperature. Compare
with techncal data. The max.
temperature increase is
obtained with D.H.W
.
ther
mostat on position 9. If
flow rate is not sufficient,
check imcoming main water
supply
.
Nor
mal operation carr
y out
electrical safety checks (see
section 5.1 preliminar
y
electrical checks).
Check D.H.W
. operation
Sheet J
Does actuating lever operate
D.H.W
. microswitch on
diver
ter valve/water section
assembly?
Check cold water inlet
pressure is sufficient. Check
filter in cold water inlet is
clean.
Check cold water isolating
valve (3, fig. 50) is fully
opened (tur
n anticlockwise).
Does lever move now?
Ye
s
No
Draw hot water at high rate.
Check/replace
D.H.W
. microswitch.
Check/clean diaphragm and
venturi in the bottom par
t of
the diver
ter valve/water
section, replace as necessar
y.
Replace diver
ter section.
No
No
No
Ye
s
Ye
s
Ye
s
