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STHSC ed 0710
HERCULES Solar 26 1A
Technical Documentation
Technical Documentation
ERROR 16
Fan anomaly
16
a
24 VDC is present to clamps 1-2 of the connector X7.
No
Replace the P.C.B.
Yes
The wiring between the P.C.B. and fan is OK.
No
Restore the electric connection/replace the wiring.
Yes
Replace the fan. If the anomaly persists, replace the P.C.B.
16
b
The wiring between the P.C.B. and fan is OK.
Check continuity of the cables on clamps 3-4-5 of the connector x7 No
Restore the electric connection/replace the wiring.
Yes
Replace the fan. If the anomaly persists, replace the P.C.B.
ERROR 20
Parasite flame block
20
The detection electrode and the relative wiring are integral.
No
Check/replace detection electrode/replace wiring.
Yes
Replace the P.C.B.
ERROR 23
Return probe anomaly
Breakage of the return probe resistance (the anomaly does not affect boiler
functioning
23
The resistance (R9) is present on the connector X9 clamps 8-9 of
the P.C.B.
No
Restore/replace the electric resistance (2.2 kΩ 1/4 W).
Yes
Replace the P.C.B.
ERROR 24
Push button control panel anomaly
24
The buttons on the control panel function regularly (check that a
"click" is heard when the button is pressed).
No
Check that there are no keys blocked or jammed under the control panel.
Yes
Replace the display board
ERROR 27
Insufficient circulation
27
The boiler pump functions correctly.
No
See section B
Yes
The pump/s functions correctly.
No
See section G
Yes
Any CH system zone valve or cut-off cocks are open.
No
Restore circulation in the CH system by acting on the closed devices
and also check:
- the correct functioning of the boiler by-pass;
- the opening times of any zone valve (on requirement it is possible to delay
ignition of the burner by acting on the boiler TIMER RT parameter);
- the correct functioning of any thermostatic valves.
Yes
The NTC flow probe is OK (10 kΩ at 25°C).
No
Replace NTC probe.
Yes
Check/clean/replace the main heat exchanger (condensation module).
If the anomaly persists, replace the P.C.B.