Immergas HERCULES Condensing 26 2 E Manual page 71

Technical Documentation
Sections
230 VAC are present on the L-N terminals of the P.C.B.
The P.C.B. fuse is integral.
A
The wiring between the P.C.B. and display board is OK.
Replace the P.C.B. If the anomaly persists, replace the display board.
230 VAC are present to the clamps 3-4 of connector X16 on the
P.C.B.
20VAC are present on the boiler pump clamps.
B
The motor shaft turns freely.
The start-up condenser is integral.
Replace the boiler pump.
CENTRAL HEATING MODE:
230 VAC are present to the clamps 1-3 of connector X1 on the
P.C.B.
DOMESTIC HOT WATER MODE:
230 VAC are present to the clamps 2-3 of connector X1 on the
P.C.B.
C
The wiring between the 3-way motor and the board is OK.
The 3-way cartridge functions regularly (it is not blocked).
Replace 3-way valve motor.
The gas valve is calibrated correctly.
D
The NTC flow probe is OK (10 kΩ at 25°C).
In DHW functioning mode, also check the DHW NTC probe.
Replace the P.C.B.
The operations stated below are indispensable for checking the quality of the relay electric contacts positioned on the board.
Replace the fuses checking that there are no short circuited components (pump, fan, gas valve, etc...).
Check safety device times and the complete power removal from the gas valve, operating as follows:
E
- close the gas supply and make a functioning request;
- check that, after 2 ignition attempts, the display shows error "01".
- with the help of the single wire wiring diagram, use a tester to check that there is no voltage on the gas valve power supply cables.
STHCkW ed 04/09
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Technical Documentation
Check the electric power supply upstream from the boiler and restore it.
No
See section E
No
Restore the electric connection/replace the wiring.
No
Replace the P.C.B.
No
Restore the electric connection/replace the wiring.
No
Release the pump by acting on the shaft after having loosened the front
No
cap.
Replace the condenser.
No
Replace the P.C.B.
No
Restore the electric connection/replace the wiring.
No
Release/replace the 3-way cartridge.
No
Adjust CO values to Minimum and Maximum in compliance with that
No 2
stated in the instruction book.
Replace NTC probe.
No
69
HERCULES Condensing Export