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18 Fault Finding
COMPONENT NORMAL MEASURE CHECK
Gas control valve
Under demand during ignition sparks: If 0 Volt:
the gas control valve
Resistance of coil 116Ω 24V dc for 1 to 2 seconds, then is not faulty.
12Vdc (constant) at the gas control
If 24 Volts and then 12 Volts
valve electrical connection.
but no gas at the burner:
Check if the gas control valve is
stuck. If not, check the
adjustment valve.
Adjustment valve
Close the gas inlet: If the valve does not move:
(step motor) Dismantle the step motor (screw not Check the connections at both
sealed in). Trigger a demand and check motor and control board (PCB).
that the valve opens during the ignition. Change the motor. Replace the
control board (PCB).
(30ci Only)
Three way valve.
When heating is on: If voltages are different:
Electrical supply to motor 230V ac between 1 and 2 of the motor. Connections.
0Ω between 1 and 3. About 25V ac to 35V ac between 2 and 3. Control board (PCB).
9.6kΩ between 1 and 2.
When hot water is on:
Three way valve lead.
9.6kΩ between 1 and 3. 230V ac between 2 and 3 of the motor. 3 2 1
(1, 2 and 3 marked on About 25V ac to 35V ac between 1 and 2.
the motor).
Thrust action of the motor. Unfasten the clip (YES, no risk of water If electrical supply is OK.
(remove gas control valve leak), pull out the motor and leave it but the motor axle does not move
before testing) plugged in. Replace the motor, or replace
When hot water is on:
the spindle should the control board (PCB).
pull in.
When heating is on :
the spindle
should push out.
(30ci Only)
Domestic water flow
To test:
Use a new detector and
connect it electrically in place of
the faulty one . Blow through to
simulate a demand for water.
COMPONENT TESTING DATA
TYPE OF FAULT CHECK
No display on control panel • 230V supply
• PCB fuse
• Connection between PCBs
No domestic hot water 30ci Only) • Loose connections on control board (PCB), Fault F9
No central heating • Connections on air pressure switch (electrical or tubes)
(Red flashing warning light and flashing disconnected, Fault F2
fault code in display) • Faulty control or interface board (PCB's), Fault F9
• Water pressure, flashing pressure
• Shortage of air or gas, Fault F1 or F2
• Faulty temperature sensor, Fault F9
• Overheating, Fault F9
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