Baxi COMBI 424 - Page 15

Fig.8 Start up and checking (continued)
IMPORTANT: Where Low Flow Taps or Fittings are
intended to be used in the DHW system connected
to the boiler it is strongly recommended that the
DHW flow rate DOES NOT fall below 2.5 l/min.
This will ensure reliable operation of the DHW function.
Is the Timer ON and
calling for heat ?
Is the Room Thermostat
(if fitted) set high enough ?
12
1
2
3
4
5
6
7
8
9
10
11
Typical
examples
of external
timer
Ensure timer is set for
Central Heating ON (see
any instructions supplied
with timer)
NO
YES
YES
NO
15
10
5
20
25
15
10
5
20
25
Turn Room Thermostat
to maximum setting
(typical example shown)
CH ON
CH OFF
bar
0
1
2
3
4
Is the Central Heating
System Pressure
between 1.0 and 2.5 bar ?
Repressurise the system to
between 1.0 and 1.5 bar.
NO
YES
R
Error Code flashing between
E.02 and .07 indicating system
pressure below 0.5 bar.
YES
If you don’t know what you need to do
to get the boiler to light, or need help with
the system and controls, contact your
installer as soon as possible
R
PN-0000230
5 Operation
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