
MAINTENANCE INSTRUCTIONS
51
6.9 Function codes
Code
Function
Description
F07
Flue test function
enabled
(Chimney-
Sweeper)
Pressing ‘
’ button for 7 seconds the Flue test function is enabled.
Pressing the boiler Off button the function is disabled.
The Flue test function operates the boiler at the maximum heating pressure
for 15 minutes without any modulation. The function is useful for combustion
testing.
F08
Frost Protection
function
(Central heating
circuit)
The function is automatically enabled when the heating sensor detects a
temperature of 5 °C. The boiler operates at minimum gas pressure with the
diverter valve in the winter position. The function is disabled when the
temperature detected by the sensor reaches 30°C.
F09
Frost Protection
function
(D.H.W circuit)
The function is automatically enabled when the D.H.W sensor detects a
temperature of 4 °C. The boiler operates at minimum gas pressure with the
diverter valve in the ‘summer’ position. The function is disabled when the
temperature detected by the sensor is 8 °C in the D.H.W circuit or 30 °C in
the central heating circuit.
ERROR
CODE
PROBLEM
POSSIBLE CAUSE
REMEDY
RESET
E17
MODULATOR
x.
GAS VALVE
MODULATOR OUT OF
ORDER
x.
REPLACE PART.
Manual Reset
(Switch off the
power supply)
E18
INADEQUATE
CIRCULATION
y.
PRIMARY OR
SECONDARY HEAT
EXCHANGER
OBSTRUCTED.
z.
PUMP MALFUNCTION OR
PUMP IMPELLER DIRTY.
y.
CLEAN OR REPLACE PART.
z.
CLEAN OR REPLACE PART.
Manual Reset
(Switch off the
power supply)
E21
GENERAL PCB
MALFUNCTION
y.
MICROPROCESSOR
MALFUNCTION: IT
DETECTS A WRONG
SIGNAL .
u.
THE PCB RESETS
AUTOMATICALLY THE ERROR.
Automatic
E22
PARAMETER
PROGRAMMING
REQUEST
aa.
LOSS OF
MICROPROCESSOR
MEMORY.
aa.
REPROGRAM PARAMETERS.
Manual Reset
(Switch off the
power supply)
E35
FLAME DETECTION
MALFUNCTION
bb.
IONISATION ELECTRODE
MALFUNCTION
cc.
IONISATION ELECTRODE
CABLE MALFUNCTION
dd.
PRINTED CIRCUIT
BOARD MALFUNCTION
bb.
REPLACE OR CLEAN PART
cc.
REPLACE PART
dd.
REPLACE PART
Manual Reset
(press the ‘
’
Reset button)
E40
ELECTRIC POWER
SUPPLY
ee.
ELECTRIC POWER
SUPPLY OUT OF THE
OPERATION RANGE
(
≤
160 /
≥
285 volts)
ee.
CHECK THE POWER SUPPLY
NETWORK (THE ERROR
DISAPPEARS AUTOMATICALLY
WHEN THE POWER SUPPLY IS
BACK WITHIN THE REQUIRED
RANGE)
Automatic