DORCHESTER DR-FC 25, Installation, Commissioning And Maintenance Instructions

Page: 83 / 98

is
Instruction
M
anu
al
DR-
F
C
83
Wa
rn
in
g
Ma
intena
nce may
o
nly be pe
rformed
b
y a
qu
alifie
d se
rvi
ce and main
te
nance
e
ngin
eer
.
F0
9 (lo
ck ou
t
e
rro
r)
W
ater temp
erature
protection
.
Te
mp
erature at
the top
of the he
ate
r
e
xce
eds
93°C.
1.
C
heck tha
t the circula
tion pump (if
p
resent) is
w
orking.
2.
C
heck the
p
osition
o
f th
e te
mp
erature senso
r T
1
.
3.
R
eset
the wa
ter he
ater
co
ntro
ller
.
n
Remark
Error “F0
9”
re
ma
ins active in th
e event th
at
the water
tempe
ratu
re d
uring
a re
set
was h
igh
er than
78
o
C. If this is the
ca
se
, first draw water of
f b
y op
enin
g th
e
n
earest hot
wa
te
r
tap,
so
that cold water can flow in
.
If the
e
rro
r can
not b
e
resolved
o
r is
pe
rsi
sten
t,
cont
act you
r
in
st
a
lle
r.
F1
0 (lo
ck ou
t
e
rro
r)
Restriction on
nu
mb
er
of i
gni
tio
n
atte
mp
ts
base
d on pressure
switch st
ate chan
ges.
P
res
sure switch not
cl
os
ing
.
1.
C
heck the
ru
nnin
g sp
eed
o
f the fa
n.
See
’8
.7
.4
Di
sp
la
yi
ng
w
ate
r h
eater
sp
ecification
s’
.
2.
C
heck that
the
ho
ses o
n the
pressure
switch a
nd
th
e a
ir sup
ply
h
ose b
etween
fan
and
burn
er are
correctly fitted. Re
fit the
se if
necessary
.
3.
Check for cracks
in the
hoses
on the pressure
switch and
the
a
ir supp
ly hose b
etween
fa
n and
burne
r. If ne
cessary
, rep
lace
th
e ho
se
s.
4.
C
heck whether the fl
ue ga
s
di
sch
arge is compli
ant with
Ta
bl
e
3.
7
.
5.
C
heck
for
bl
ockage
in
the
flue
g
as d
ischarge
. Remo
ve
a
ny
b
lockag
e
tha
t may be presen
t.
6.
C
heck fo
r
b
lockag
e in the co
nden
sate
discha
rg
e. Remove an
y
b
lockag
e
tha
t may be presen
t.
7.
Mea
sure th
e pressure dif
fere
nti
al across th
e pressure switch.
Ta
bl
e
12
.1
. If th
ere is i
nsuf
ficien
t p
re
ssure di
ffere
ntial, cle
an the
h
eat excha
nger
. If the pre
ssu
re dif
feren
tial is a
cce
pt
a
ble
, che
ck
that
the pressure switch is
closin
g, usi
ng a mu
ltimeter
.
8.
If the
e
rro
r can
not b
e
resolved
o
r is
pe
rsi
sten
t,
cont
act you
r
in
st
a
lle
r.
To
rep
lace
the
ne
ce
ssary p
a
rt
s, yo
u mu
st
cont
act you
r in
st
al
ler
.
Ta
ble
10.2
Displ
ayed errors (Shee
t 7 of
1
0)
Co
de
+
De
scrip
tio
n
Po
ss
ib
le
c
aus
e
S
o
lu
tio
n
R
emar
k