Saunier Duval Themaclassic F30E SB Instructions For Use Installation And Servicing page 38

TYPE OF FAULT
No display on control panel
No domestic hot water (F30E/F35E Only)
No central heating
(Red flashing warning light and flashing
fault code in display)
COMPONENT
Gas control valve
Resistance of coil 116
Adjustment valve
(step motor)
(F30E/F35E Only)
Three way valve.
Electrical supply to motor
0 between 1 and 3.
9.6k between 1 and 2.
9.6k between 1 and 3.
(1, 2 and 3 marked on
the motor).
Thrust action of the motor.
(remove gas control valve
before testing)
(F30E/F35E Only)
Domestic water flow
4000123924-2
18 Fault Finding
CHECK
• 230V supply
• PCB fuse
• Connection between PCBs
• Loose connections on control board (PCB)
• Connections on air pressure switch (electrical or tubes)
disconnected
• Faulty control or interface board (PCB's)
• Water pressure, flashing pressure
• Shortage of air or gas
• Faulty temperature sensor
• Overheating
COMPONENT TESTING DATA
NORMAL MEASURE
Under demand during ignition sparks:
24V dc for 1 to 2 seconds, then
12Vdc (constant) at the gas control
valve electrical connection.
Close the gas inlet:
Dismantle the step motor (screw not
sealed in). Trigger a demand and check
that the valve opens during the ignition.
When heating is on:
230V ac between 1 and 2 of the motor.
About 25V ac to 35V ac between 2 and 3.
When hot water is on:
230V ac between 2 and 3 of the motor.
About 25V ac to 35V ac between 1 and 2.
Unfasten the clip (YES, no risk of water
leak), pull out the motor and leave it
plugged in.
When hot water is on: the spindle should
pull in. When heating is on : the spindle
should push out.
38
CHECK
If 0 Volt: the gas control valve
is not faulty.
If 24 Volts and then 12 Volts
but no gas at the burner:
Check if the gas control valve is
stuck. If not, check the
adjustment valve.
If the valve does not move:
Check the connections at both
motor and control board (PCB).
Change the motor. Replace the
control board (PCB).
If voltages are different:
Connections.
Control board (PCB).
Three way valve lead.
3 2 1
If electrical supply is OK.
but the motor axle does not move
Replace the motor, or replace
the control board (PCB).
To test: Use a new detector and
connect it electrically in place of
the faulty one . Blow through to
simulate a demand for water.