Saunier Duval Semia Condens F24 E Instructions For Use Installation And Servicing page 39

YES
NO
g) Does - Check if pump is blocked
Ÿ
the - Pump faulty, if there is 230 V across pump terminals
pump run? - PCB faulty, if not power is supplied to the pump
YES
NO
h) Does the flame - Check and adjust the gas pressures on the gas valve as indicated in the manual
Ÿ
rise up - Gas valve modulator faulty, if there is nearly 5 v = across the modulator terminals
after 8 seconds? - PCB faulty, if there is not power to the modulator or the voltage is less than 3V =
YES
i) Is
NO
the water
Ÿ
warming up
to the tap? indicated in the manual ?
YES
DECREASE THE HOT WATER FLOW RATE TO APPROXIMATELY 5 LITER PER MINUTE
j) Does
the flame of the NTC sensor
modulate
NO
Ÿ
after
a few seconds ?
YES
TURN OFF THE HOT WATER TAP
TURN THE MAIN SELECTOR TO "WINTER", SET THE HEATING KNOB AT MAXIMUM, TIME-CLOCK TO "1"
k)
NO
Does
Ÿ
the
boiler
work?
YES
NO
l) Does the pump
Ÿ
start ?
YES
NO
m) Do
Ÿ
radiators valves of the system
heat up?
YES
NO
n) Is the water Does the pressure
Ÿ
pressure rise up over 2 bar
stable on the when temperature
pressure gauge?
YES
END OF THE TEST
NO Ÿ
Is the domestic hot
water flow rate
greater than the one
YES Ÿ
Check resistance
and if necessary,
Ÿ
replace
the NTC
NO Ÿ
- Set the temperature on the room thermostat
Is the room
thermostat Make a link on the PCB-M10 across terminals 39 and 40:
YES Ÿ
calling for - Room thermostat faulty, if the boiler starts working
heating? - Faulty time-clock,if no continuity across switch terminals
- PCB faulty, if the boiler does not operate
Are the switches 5 and 6
on the PCB
in position OFF ?
NO Ÿ
Are all the - Turn on all the radiator valves and insulating valves
YES Ÿ
turned on ? - Bleed air out of the radiators
NO Ÿ
- Verify the filling check valves are turned off
YES Ÿ
- Pressurize the expansion vessel. If leaks occurs from
is above 50°C the valve, replace the expansion vessel
Guide for the correct electrical reading
- Domestic hot water exchanger dirty
- Check gas valve for correct gas regulation
- Reduce the hot water flow rate to the tap
NTC values
- Check the gas valve for correct gas
0°C = 33 k:
pressure
Ÿ
20°C = 12,5 k:
- Check on the PCB the
60°C = 2,5 k:
80°C = 1,3 k: switches 7 and 8 are set to OFF
NO Ÿ
- Set switches 5 and 6 to the off position
YES Ÿ
- Replace PCB
37
In case of difficulty: