Installation manual

Coopra Advanced Heating Technologies Installation manual 40 EN
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8.11. Malfunction code 'F' (flashing)
After three failed attempts in a row, the unit will lock (flashing 'F').
This can have very different causes:
• no gas
• no ignition
• bad flame formation
• bad ionisation current
8.11.1. Gas control will not open (no voltage)
Careful !!! 210 VDC
If the gas control is not
connected, the Manager will see
this at the beginning of the heat
demand as a malfunction and
therefore lock.
To measure the voltage on the
gas control, the gas control must
remain connected.
During the starting period, the gas
control is connected to a voltage of 210 VDC.
8.11.2. Gas control will not open (gas inlet pressure too
high)
The gas pressure in the gas pipe
before the gas control is too high.
The safety valves of the gas
control cannot open with gas
pressures of >60 mbar.
• open the inlet pressure
measurement nipple of the gas control
• connect the pressure meter
• measure the gas pressure (10 - 50 mbar)
8.11.3. Gas control will not open (coils defective)
The electrical coils of the gas
control are burnt out and the
safety valves of the gas control
will therefore not open.
• The two outermost contacts on the gas valve should be
measured for resistance
• the value that the multimeter shows should be about
4.1 kOhm at ambient temperature.
8.11.4. Gas/air mixture is not correctly adjusted
see Chapter 4. : Adjustment full load and low load.
8.11.5. Check glow plug
The 230 volt glow plug is in order if the measured resistance at
room temperature is about 1.0 - 1.4 kOhm.
• remove the connection of the glow plug (230 V)
• connect a multimeter
• measure the resistance
Replacing the glow plug
Careful !!! 230 VAC
The glow plug is a resistance through which current is fed. As a
result of the high temperature of the glow plug, the burner can
be ignited. This makes the glow plug a part that wears. The
average life of the glow plug is estimated at 8 years, depending
on the number of starts and on the variation of the mains
voltage.
• remove plug from glow plug (230 V high voltage)
• remove glow plug from cover of unit
• replace glow plug
8.11.6. Check ionisation current
When the unit burns on chimney sweeper function, the ionisation
current can be read directly on the display.
• Ionisation current in full load is correct between 6 µA
DC to 13 µA DC.
• Ionisation current in low load is right 3µA DC to 13 µA
DC.
Insulating layer
With high temperature flame, an
insulating layer can be formed on
the probe. This layer can be
simply removed with fine
sandpaper. However, coarse
grooves in the surface of the pin
will accelerate new formation of
the layer.