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1.5
Operation lights
Three lights (9 in Fig. 1.3) give detailed indi-
cation regarding the operation of the boiler.
The following table gives the relationship
between each of the possible light combina-
tions and their meaning.
A short pulse every 4 sec-
onds: stand-by condition
Function selector in
position.
Anti-freeze system active
1 second pulse every 2
seconds: normally oper-
ating boiler. Function se-
lector in
C.h. operation
Frost protect operation
Faulty c.h. temperature
probe NTC
Faulty flue temperature
probe NTC
Faulty primary circuit
(no water or low c.h.
pressure)
Faulty primary circuit
(absence of flow)
Faulty air pressure sen-
sor
Lack of burner ignition (no
ignition signal from the full
sequence ignition device)
Safety thermostat lock
out
Flue temperature probe
NTC lock out
Flame detection error
APPLIANCE DESCRIPTION
position
Other faults
Lack of power supply or
faulty electr. control p.c.b.
Meaning of symbols:
Lamp OFF
Lamp ON
Flashing lamp, alone or simultane-
ously with an other lamp
Flashing lamp, alternate with another
lamp
If the lights combination observed is not
included in the above table a fault may be
indicated.
Reference should be made to the following
table.
In this case switch off the boiler, as de-
scribed in section "Extinguishing" to page
12 and call a competent and responsible
Service Engineer.
- 9 -
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