INSTALLATION INSTRUCTIONS
59
6.9 Function codes
Code
Function
Description
F07
Flue test function
active
(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.
F28
Legionella
Prevention Function
Function active for storage boilers only. It comes into operation every 7 days.
It brings the hot water temperature of the storage cylinder up to 60°C whatever
temperature value is set for hot water.
F33
System purging
function
The function is automatically enabled at the first ignition of the boiler. The boiler
operates a series of cycles for a period of 5 minutes. Each cycle consists in: the
pump is enabled for 40 seconds and then disabled for 20 seconds. The starting of
the boiler is only allowed at the end of this function.
In case of an open contact of the water pressure switch, this function can be
enabled during the normal boiler operation. Once the contact is closed a purging
cycle of 2 minutes is performed.
ERROR
CODE
PROBLEM
POSSIBLE CAUSE
REMEDY
RESET
E18
INADEQUATE CIRCULATION
x.
PRIMARY OR
SECONDARY HEAT
EXCHANGER
OBSTRUCTED.
y.
PUMP MALFUNCTION OR
PUMP IMPELLER DIRTY.
x.
CLEAN OR REPLACE PART.
y.
CLEAN OR REPLACE PART.
Automatic
E21
GENERAL PCB
MALFUNCTION
z.
MICROPROCESSOR
MALFUNCTION: IT
DETECTS A WRONG
SIGNAL .
z.
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
Summary of Contents for RK 25 /B
Page 2: ......
