Immergas HERCULES Condensing 26 2 E Manual page 70

Technical Documentation
The L.T. zone 3 safety thermostat functions regularly (intervention
temperature higher than 55 °C).
The zone pump and the mixing valve function correctly.
35
b
Any CH system zone valve or cut-off cocks are open.
The L.T. zone 2 NTC flow probe is OK (10 kΩ at 25°C).
Replace the zones digital control unit.
ERROR 36
The zones digital control unit is connected correctly.
36
Replace the zones digital control unit. If the anomaly persists, replace the boiler P.C.B.
ERROR 37
The boiler power supply voltage exceeds 190 VAC.
37
The electric power supply connection wires and relative external
fuses are integral.
Replace the P.C.B.
STHCkW ed 0409
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Replace the over-heating safety thermostat.
No
See section G
No
Restore circulation in the CH system by acting on the closed devices
and also check:
- the correct functioning of the zone by-pass;
No
- 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.
Replace NTC probe.
No
IMG Bus communication loss
Check the connection between the boiler P.C.B. (clamps 41-44) and the
No
zones digital control unit (clamps 41-44).
Low power supply voltage
Restore the correct electric power of the appliance (230 VAC ±10%).
No
Restore the electric connection/replace the cables/external fuses.
No
68
Technical Documentation
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