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3.4 FAULT FINDING
Despite everyones best efforts some problems can occur and lead to complaints
from the householder.
The following checks should be carried out by the installer before calling the
manufacturer.
1. Noise when hot water tap is opened/closed
If the plate heat exchanger pump is noisy when the hot water tap is opened, then
check the level of water in the F & E cistern and vent the pump if necessary.
Water hammer - loose pipework and/or tap washers.
2. Causes of 'Unsatisfactory Hot Water Service'
F
A
U
T L
C
O
N
D
T I
D
H
W
e t
m
p
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a r
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e r
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i a
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H
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c u
u t
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w
d l i
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s
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D
H
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e
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0 6
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w
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e
f
o l
w
a r
e t
S
o t
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n
t o
h
e
t a
n i
g
3. Overflow from Feed and Expansion Cistern
Check that the controlled level of water in the cistern is no higher than necessary.
Adjust if required or check the ballvalve is shutting off the water supply.
4. Operation of the red indicating lamp on the front of the appliance.
This will light to indicate a fault condition. Initiallly this may be due to a failure to
move one end of the link (L1) from Terminal 12 to Terminal 11.
However, once the unit is in use it will indicate an overheat condition and the manual
overheat button will have popped out. If this is the case check and replace as
necessary the relevant immersion heater thermostat (set to 75ºC).
Manually reset the appliance by pressing in the manual overheat button (inside
the appliance front cover).
O I
N
P
O
S
-
h T
r e
m
a
s l
o t
e r
s i
-
e T
m
p
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l
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w
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m
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-
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s i
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t o
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m
s s i
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e
. d
-
N
o
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o
w
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p
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e
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-
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e
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l e
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f
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S
B I
E L
C
A
U
S
E
S
o c
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D /
H
W
p
u
m
p
s i
s
u t
k c
s n
r o
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p
u
m
p
p s
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n
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m
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f
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w
f
o r
m
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e
p
p i
e
s i
o l
w
n i
h t
e
F
&
E
c
t s i
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. n
p i
p
e
d
f /
u a
t l
a l
m
p
o
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s p
s
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k c
n i
g
w
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e
n
v
l o
a t
g
e
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s
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t r
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u
n
l i t
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t l
g a
e
s i
o t
o
p
e
e
d
c
o
n
r t
l o
P
C
B
a
n
/ d
r o
r o
s i
a /
e r
a f
l u
. y t
r e
h t
r e
m
o
t s
t a
e t
m
p
e
a r
u t
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o
u
d l
b
e
7
º 2
. C
c
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c
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u
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s e
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c r
u
t i
a
n
d
s a
r t
p i
p
e
d
f /
u a
t l
g i l
t h
o
n
y t l
Page 22
3.0 SERVICING
- Quick Links:
- Fault Finding
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