68
STHCkW ed 0409
HERCULES Condensing Export
Technical Documentation
Technical Documentation
35
b
The L.T. zone 3 safety thermostat functions regularly (intervention
temperature higher than 55 °C).
No
Replace the over-heating safety thermostat.
Yes
The zone pump and the mixing valve function 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 zone 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 L.T. zone 2 NTC flow probe is OK (10 kΩ at 25°C).
No
Replace NTC probe.
Yes
Replace the zones digital control unit.
ERROR 36
IMG Bus communication loss
36
The zones digital control unit is connected correctly.
No
Check the connection between the boiler P.C.B. (clamps 41-44) and the
zones digital control unit (clamps 41-44).
Yes
Replace the zones digital control unit. If the anomaly persists, replace the boiler P.C.B.
ERROR 37
Low power supply voltage
37
The boiler power supply voltage exceeds 190 VAC.
No
Restore the correct electric power of the appliance (230 VAC ±10%).
Yes
The electric power supply connection wires and relative external
fuses are integral.
No
Restore the electric connection/replace the cables/external fuses.
Yes
Replace the P.C.B.
Summary of Contents for Hercules Condensing 26 2 E
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