Service manual
Table Of Contents
C = heat demand heatin
g
heat demand C burner is of
f
burner starts Pum
p
is on
d = heat demand for hot water combi-boiler or caused b
y
automaticall
y
Fan is on
b = heat demand for hot water external d 3 minutes Burner is of
f
c
y
linder or anti-c
y
clin
g
b counte
r
No dot indication, burner is off continuous
J
continuous
TWIN
If either the flow sensor or return senso
r
heat demand C hi
g
h flow o
r
burner is off, block removes automaticall
y
exceeds a tem
p
erature of 93'C, continuous return senso
r
blocked b
y
maximum when the flow tem
p
erature
the burner is switched off. tem
p
erature flow- or return dro
p
s 5°C below set
p
oint
(
93°C
)
tem
p
erature
If the flow sensor tem
p
erature is 3'C above heat demand C flow burner is off, block removes automaticall
y
set
p
oint, the burner is switched off. continuous tem
p
erature blocked b
y
set
p
oint when the flow tem
p
erature
above dro
p
s 5°C below set
p
oint
set
p
oint
if the tem
p
erature difference between flow- heat demand C flow/return burner is off, block removes automaticall
y
and return sensor becomes less than - 5'C, continuous tem
p
erature blocked b
y
sensor when the tem
p
erature
the boiler start is blocked. difference is tem
p
eratures difference between flow
less than - 5'C and return sensor
becomes within - 5'C
if the tem
p
erature difference between flow- heat demand C flow/return burner is off, block removes automaticall
y
and return sensor becomes more than 45'C, continuous tem
p
erature blocked b
y
sensor when the tem
p
erature
the boiler start is blocked. difference tem
p
eratures difference between flow
is > 45'C and return sensor
becomes less than 20'C
at each start the
g
low
p
lu
g
p
rotection counter heat demand C
g
low
p
lu
g
g
low
p
lu
g
counter is boiler restores automaticall
y
is incremented 1 ste
p
. If the counter is too hi
g
h continuous
p
rotection decremented 1 ste
p
in time
(
xxx ste
p
s
)
, the boiler start is blocked. counte
r
p
er minute
before each burner start, the difference
between flow- and return temperature
must be less than 20°C.
Trouble shooting manual EN E000129004