Remeha Selecta
48
Description
Cause / checkpoints
00
Flame simulation
(flame detected when
control is in the
off
-
position)
Gas valve is leaking or sticks in the open position.
Check and replace valve.
01
Short circuit 24V
Check:
the wiring.
02
No flame formation
or no ionisation
(after 5 starting
attempts)
Note:
Measure ionisation in
Volts between termi-
nal 5 on the terminal
strip and earth
(1V = 1
µ
A)
a. No ignition spark, check:
- the connection of ignition cable and spark plug
cover
- the ignition cable and the electrode for ‘burn out’
- the electrode distance; this has to be 3 to 4 mm
- the earth connection
b. Ignition spark present, but no flame, check
whether:
- the gas valve is open
- the gas supply pressure is sufficient
- the gas pipe has been purged
- the gas valve is being actuated during ignition and
opens
- the electrode has been mounted correctly, and is
clean
- there is a blockage / assembly error in the gas
pipe
- the gas / air ratio has been adjusted correctly
(see
Par. 11.2.1)
- re-circulation of flue gas is occurring (internally/
externally)
- there is a blockage in the air supply or flue gas
discharge (eg blocked siphon)
c. flame present, but no or insufficient (< 4
µ
A)
ionisation, check:
- the earth connection of the ignition electrode
- the flame should be stable
- gas/air setup in full load and part load
- the ignition electrode visually for white oxide (clean
with sand paper or screwdriver) and electrode
pins shape (do they have their original shape?)
and distance between the pins (the gap should be
between 3 and 4 mm)
- whether one of the temperature sensors is defec-
tive (leakage current)
04
Power failure during failure shutdown.
05
External influences
Check
for external EMC influences
