Immergas V2 - Page 49

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3.5 POSSIBLE PROBLEMS AND THEIR CAUSES
- Presence of air in the system. Check the opening of the boiler vents and the central heating system and act on the 3-way mixing valve
(if present), keeping it open for de-aeration. Make sure the system pressure and expansion vessel factory-set pressure values are within
the set limits; the factory-set value for the expansion vessel must be 1.0 bar, and system pressure between 1 and 1.2 bar.
- Mixed zone safety thermostat intervention. It can depend on the blocked pump, the blocked mixing valve or an anomaly on the
P.C.B. Check the correct operation of the components indicated above, making sure that the anomalies signalled by ashing of the
LEDS H9 or H10 (according to the cases) on the P.C.B. disappear.
- Mixed zone ow adjustment NTC probe anomaly. Replace the component and/or check its correct operation, making sure that the
anomaly signalled via switch-on of the LEDS H9 or H10 (according to the cases) on the P.C.B. disappears.
- Mixed zone ow temperature insucient or too low. Can depend on an incorrect regulation of the trimmer (R12 or R13) present
on the P.C.B. from the blocked or broken mixing valve (if present) or on the temperature set on the lower boiler at that requested in
the mixed zone circuit (only for boilers connected without DIM BUS). Check the correct regulation of the trimmer, check the correct
functioning of the mixing valve (if present). Make the boiler function with a ow temperature over that set for the mixed zone (only
for boilers connected without DIM BUS).
- e table below identies the errors displayed on the boiler, when the manifolds are connected with the DIM BUS:
Code Description
32 Mixed zone 2 probe anomaly
33 Mixed zone 3 probe anomaly
34 Safety thermostat intervention Mixed zone 2
35 Safety thermostat intervention Mixed zone 3
36 DIM Bus communication loss
46 Marker safety thermostat kit intervention (optional)
STD.009285/001