boiler protection devices
32
Boiler protection devices
The boiler is protected from malfunctioning by means of internal
checks performed by the electronic microprocessor P.C.B., which
stops the boiler from operating if necessary.
In the event of the boiler being shut o in this manner, the led code
shows the type of shut-o and the reason behind it.
There are two types of shut-o :
Safety shut-o
This type of error is “volatile”, which means that the boiler starts up
again automatically as soon as the problem which caused the shut-o
is removed; the yellow led 9 blinks and green CH temperature leds 1
indicate the error code- see table below.
As soon as the cause of the shut-o disappears, the boiler starts up
again and continues to operate normally.
Note : In the event of insucient water pressure inside the heating
circuit, the boiler will perform a safety shut-o (yellow led 9 blinks - leds
50-60 blink – see table). To re-pressurise the boiler, it will be necessary
to connect the silver exible hose supplied to the two isolating points
underneath the boiler, once the hose is connected, open up both of
the black quarter turn handles until the pressure reads 1.5 bar on the
pressure gauge. If the pressure drops very frequently, there may be a
water leak at some point in the system.
Shutdown
This type of error is “non-volatile”, which means that it is not removed
automatically.
The red led 8 light and green leds 1 indicate the error code- see table
below.
To restore normal operation press the button on the control
panel.
Table summarising error codes
Green Leds
Temperature indicator
Reset
Note
Description ❍ = flashing light
● = lit
40 50 60 70 80 90 yellow red
● ●
X Overheat
●● ●
X Insu cient circulation
Insu cient water pressure (request lling)
C.H. Flow temp. probe circuit open / short circuit
C.H. Return temp. probe circuit open / short circuit
External sensor circuit open / short circuit
Floor thermostat contact open
●● ●
X Heating delivery probe problem
Insu cient circulation
EEPROM error
Communication error
Too many (> 5) resets in 15 minutes
● ●
X Main P.C.B. error
Room sensor circuit open / short circuit
●
X No ame detected
Flame detected with gas valve closed
●●● ●
X Flame lift
1st Ignition Failed
2nd Ignition Failed
Flame cut-o
●● ●
X Thermofuse open
●● ●
X Fan speed error
Important
If this shutdown occurs frequently, contact an authorised
Technical Service Centre for assistance. For safety reasons, the
boiler will permit a maximum of 5 resets in 15 minutes (5 presses
of the
button).
Anti-frost Device.
When the electrical supply is turned on the anti-frost function acts
on the central heating ow temperature probe, independently from
other safety devices.
If the primary circuit temperature is between 3°C and 8°C the
pump will run (with the diverter valve switching between central
heating and hot water every 1 minute) until the temperature
reaches > 9°C.
If the ow temperature remains between 3°C and 8°C the pump will
continue to run for a maximum of 20 minutes unless a temperature
above > 9°C is detected in the central heating ow, after this the
burner will re (heating position) until a temperature of > 30°C is
detected.
If the central heating ow temperature is < 3°C, the burner will re
(heating position) at minimum power until the temperature reaches
> 30°C, the burner will go out.
If lockout is caused by overheat the burner will not re but the pump
will continue to run (heating position).
The anti-frost device activates only when the boiler operating
correctly :
- the system pressure is correct;
- the boiler is electrically powered;
- there is a supply of gas.
