Coopra Advanced Heating Technologies Installation manual E40C
26
CHAPTER 7. MALFUNCTIONS
High voltage !!!
230 Volt
The wiring of the pump, the three-way valve, fan
and wiring of the gas block can be under high voltage.
7.1. Serial connection
A PC or Laptop can be connected for an extensive
diagnosis and display of the functionality.
The necessary cable, with an
opto-isolator (opt coupler), and
the software kit can be
ordered at Coopra separately.
7.2. No signal on the display
When there is no signal on the display, power fails.
Check the mains voltage of 230 VAC and check
whether the on/off switch on the bottom of the
boiler is switched on.
Check the glass fuse(s) of the printed circuit board.
7.3. Boiler does not respond to central heating heat
demand
Is the parameter for the type of boiler correctly set in the
menu structure?
Parameter Application
H = 0 Central heating 15C/37C/40C
(not for hot water)
H = 1 Combi-boiler 37K
(not for TWIN, standalone only)
H = 2 Boiler 15/37B for external HWS cylinder
sensor 12kOhm (large volume cylinders)
H = 3 Boiler 15/37B for external HWS cylinder
sensor 10kOhm (large volume cylinders)
H = 4 Boiler 15/37B for external HWS cylinder
sensor 12kOhm (small volume cylinders)
(not for TWIN, stand-alone only)
H = 5 Not active
(not for central heating and not hot water)
7.4. Fitting instructions for the pressure sensor
The seal is made with a “0”-ring. The pressure sensor
must only be tightened slightly more than hand tight.
7.5. Fitting instructions for the safety valve
The safety valve must be tightened with a torque of 10
Nm.
7.6. Malfunction code 'F' (flashing)
After three failed attempts in a row, the boiler will
lock (flashing 'F').
This can have very different causes:
• no gas
• no ignition
• bad flame formation
• bad ionisation current
7.6.1. Gas control will not open (no voltage)
BE 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.
7.6.2. 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 nipple of the gas control
• connect the pressure meter
• measure the gas pressure (10 - 50 mbar)
7.6.3. 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 of the multimeter should be at ambient
temperature of 20’C about 4.1 kOhm.
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