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STEMkW Special ed 01/08 EOLO Mini kW Special
Technical DocumentationTechnical Documentation
A
230 VAC are present on terminals L-N of the P.C.B.
No
Check the electric power supply upstream from the boiler and restore it.
Yes
e P.C.B. fuses are integral.
No
See section E
Yes
Replace the P.C.B.
B
230 VAC are present on clamps 4-5 of connector X10 on the
P.C.B.
No
Replace the P.C.B.
Yes
230 VAC are present on the pump clamps.
No
Restore the electric connection/replace the wiring.
Yes
e motor shaft turns freely.
No
Release the pump by acting on the shaft after having loosened the front
cap.
Yes
e starter condenser is integral.
No
Replace the condenser.
Yes
Replace the pump.
C
HEATING PHASE:
230 VAC are present on clamps 2-3 of connector X10 on the
P.C.B.
DOMESTIC HOT WATER PHASE:
230 VAC are present on clamps1-3 of connector X10 on the
P.C.B..
No
Replace the P.C.B.
Yes
The wiring between the 3-way motor and the board is OK.
No
Restore the electric connection/replace the wiring.
Yes
e 3-way cartridge functions normally (it is not blocked).
No
Release/replace 3-way cartridge.
Yes
Replace 3-way motor valve.
D
At least20 VDC are present on the gas valve modulation coil wires.
N.B.: carry out the measurement by disconnecting the coil wires (see
gas circuit chapter).
No
Check wiring and replace the P.C.B. if necessary.
Yes
e gas valve modulation coil has a resistance of 20-25 Ohm (SIT
845).
N.B.: carry out the measurement by disconnecting the coil wires (see
gas circuit chapter).
No
Replace the gas valve.
Yes
e gas valve is set correctly.
No
Adjust minimum and maximum values of the gas valve in agreement with
that state din the instruction book.
Yes
e NTC ow probe is OK (10 kΩ at 25°C).
No
Replace the NTC ow probe.
Yes
Replace the P.C.B.
E
e operations stated below are indispensable in order to check the correctness of the electric contacts of the relays on the board.
Replace the fuses checking that there are no components in short circuit (pump, fan, gas valve, etc...).
Check safety times and the complete disconnection of the gas valve, operating as follows:
- close the gas supply and make a functioning request;
- check that, after 2 ignition attempts, LED n°6 ashes "no ignition block";
- with the aid of the single wire wiring diagram, use the tester to check there is no voltage on both main power supply cables of the main coils of the
gas valve (see gas circuit chapter).
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