Immergas HERCULES SOLAR 26 1A Manual page 67

Technical Documentation
230 VAC are present on the L-N terminals of the zones control unit
(green LED H11 on with fixed light).
The connection between the zones digital control unit and boiler
P.C.B. (clamps 41-44) is OK
F
The zones digital control unit is configured correctly ( S25 S26 S27
selectors positions as per instruction book).
Check the presence and effective request of the room thermostats of the respective zones. If the problem persists, replace the zones digital control unit.
230 VDC are present to the clamps 1-3 of connector X11 on the
boiler P.C.B.
230 VDC are present to the clamps 1-2 of connector X11 on the
pump relay board.
G
230 VDC are present to the clamps 1-2 of connector X2 on the
pump relay board.
N.B.: Check current continuity between clamp 3 of the pump relay board
connector X1 and clamp 1 boiler P.C.B. X1 connector.
Release the zone pump by acting on the shaft after having loosened the front cap and replaced it, if necessary.
N.B.: there may be a fixed red light on the pump
If digital zones control unit is used
The connections between zones digital control unit and relative zone
pumps are OK
G
Release the pumps of the respective zones by acting on the shaft after having loosened the front cap and replaced, if necessary.
N.B.: there may be a fixed red light on the pumps
STHSC ed 0710
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Technical Documentation
Check the electric power supply upstream from the zones control unit
No
and restore it.
Restore the IMG BUS connection.
No
See error section 36
Restore the correct configuration of the selectors
No
Check the electric power supply of the boiler P.C.B. and replace it if
No
necessary.
Replace the anti-jamming filter.
No
Replace the pump relay board
No
Check and restore the relative electric connections
No
65
HERCULES Solar 26 1A