Installation manual

installation manual TWIN 80 EN
(E000129016 - installation manual TWIN 80 EN - 030106v07
34
8
flashing
false flame signal
- If during standby
a false flame signal is detected for more
than 5 seconds, the boiler runs into lock-out
- If a false flame signal is detected with closed gas valve
for
more than 5 seconds, the boiler runs into lock-out
- If a false flame signal is detected during pre-rinse / post-
rinse, the regulation blocks. If the false flame signal lasts
for more than 5 seconds, the boiler runs into lock-out
check ionisation system
9
flashing
successful software
update
after successful programming of the printed circuit board
status code shows flashing 9
press set/reset button
A
flashing
lock-out, caused by high
flue gas sensor
temperature (> 105°C)
If the flue gas sensor exceeds a temperature of 105°C, the
burner locks-out
why is the flue gas temperature
exceeding 105°C? The burner
was already on low load at 90°C
and blocked at 100°C, was it?
E
flashing
internal interlock fault
- software problem (to be restored by supply interruption)
- hardware problem (cannot be restored by supply
interruption) is mostly a broken printed circuit board.
replace printed circuit board
H
flashing
lock-out, caused by
limiter,
high flow temperature
(> 105°C)
If the flow sensor exceeds a temperature of 105°C, the
regulation runs into lock-out
- check flow sensor
- check system water flow
- check pressure sensor
F
flashing
too many start attempts
successively (four failed
start attempts in a row)
-at each burner start, while the fan runs at the ignition
speed (2700 rpm), the gas valve opens and a flammable
gas/air mixture is supplied to the burner. The glow plug
ignites the gas/air mixture at the surface of the burner. If
there is insufficient ionisation current measured at the end
of the safety time, a new start attempt will be made. After
four failed consecutive start attempts, the regulation locks-
out.
- no voltage supplied from printed
circuit board (210 Vdc) to gas
control coils (broken board or
supply power too low).
- gas inlet pressure too high, so
the gas control valves remain
closed on its seats (max. inlet
pressure 60 mbar).
- defective gas control coils (R =
4.1 kOhm at room temp).
- check glow plug (R = 1.0 – 1.4
kOhm at room temp).
- incorrect burner ignition (adjust
gas/air mixture).
- ionisation probe or ionisation
cable makes short circuit with
earth (correct ionisation current 6
to 13 micro Amps).
- ionisation probe with insulation
layer (clean with sandpaper)
O
flashing
open gas valve circuit
open circuit of the gas valve cable connector bridge,
terminal X4 of the printed circuit board
repair short circuit bridge of gas
valve cable connector