17
The cover is held in place by four spring clips and can
be removed by grasping it at the top and pulling for-
ward sharply to release.
Further access can be gained by removing the con-
trol panel. (Four screws), and moving down the elec-
tronic box.
BURNER AND HEAT EXCHANGER
INSPECTION AND CLEANING
The front of the sealed air box must first be removed
(8 screws) and care should be taken to avoid dam-
aging the seal. The combustion chamber cover can
then be removed (6 screws) and gas connections
taking care not to damage the delicate insulation
material inside.
Inspect the burner and heat exchanger fins for debris
and soot. Check also for rubbish below the burner.
IGNITION AND DETECTION ELEC-
TRODES
With the combustion chamber cover removed check
the condition of the electrodes for any sign of wear or
damage.
WATER CIRCUIT CHECKS
Inspect the pipe work inside the boiler for leaks.
Check that the pressure in the system is correct (0.8
to 1.6 bar). Check the operation of the relief valve by
turning ¼ turn and check it closes without further
leakage.
Check the correct operation of the gauge. The pres-
sure should increase slightly as the temperature
rises. Finally check the filters which is situated in the
cold water inlet pipe
BURNER PRESSURE
This is factory set, but should you suspect a problem
proceed as follows: There is an easily accessible
burner pressure nipple on the gas feed pipe, between
the burner and the modulating gas valve.
The burner pressure nipple should give a reading of
35 mbar when the boiler is at full power on D.H.W.
mode. Remove the main cable plug to the gas valve
to get a minimum burner pressure reading which
should be 4,4 mbar.N.B. There is a logic program
built into the central heating enabling it to detect
when it is connected to a small system. This may pre-
vent the burner from firing on full (max press) so
ensure burner pressure is only tested in DHW mode.
FINAL CHECKS
Turn all the controls to their max position so that the
appliance begins to function. Check for gas leaks
using a suitable detector.
Check the boiler functions correctly in both central
heating and domestic hot water modes. The green
light will start flashing when the boiler is firing in either
mode.
8.- TROUBLESHOOTING
The FEB-24E has a self diagnostic system built into
its printed circuit board. Should a safety related, or
various other faults occur, then the boiler will failsafe
by locking out, which is indicated by the red neon on
the control panel.
The fault can be identified by the different sequences
in which the red neon flashes and the duration the
neon stays illuminated. The electronic failsafe is also
backed by a mechanical means of protection, should
the electronics fail to detect a fault. These mechani-
cal forms of protection will protect and ensure the
safe shutdown of the boiler.
The software protection built into the P.C.B. will run a
system check on components which are essential to
the safe operation of the boiler. This occurs before
any ignition sequence takes place. If any component
is found to be faulty or out of a predetermined range,
then lockout will be displayed.
FAULT CODES:
Each fault code begins and finishes with the red neon
illuminated for 5 seconds, the relevant fault is then
indicated by the number of 1 second flashes which
occur between the 5 second illuminations. These
range from none to 12 flashes. Please be patient
when counting the sequence as the correct identifi-
cation of the fault will save time on isolating and rec-
tifying the problem.
