Immergas 3.018921, Instruction And Warning Booklet

12

INS

TALLER

US

ER

MAINTEN

AN

CE TECHNI

CI

AN

Loss of remote control communication.

 This 

occurs if an incompatible remote control is 

connected, or if communication between the 

boiler and CAR

V2

 is lost. Try the connection 

procedure again by turning the boiler off and 

turning the selector switch (9) to position (

). If the CAR

V2

 is still not detected on re-

starting the boiler will switch to local operating 

mode, i.e. using the controls on the boiler itself. 

If this phenomenon occurs frequently, contact 

a qualified technician for assistance (e.g. After-

Sales Technical Assistance Service). 

Signalling and diagnostics - Display on Remote 

Friend Control screen (optional). 

During 

normal boiler operation the room temperature 

value is displayed on the remote control screen 

(CAR

V2

); in case of malfunction or anomaly, the 

temperature value is replaced by the relative error 

code provided in table on page 11.

Attention:

 if the boiler is in stand-by “

” code 

error “CON” will be displayed on CAR

V2

. The 

remote controls are powered constantly so as not 

to loose the memorised programs.

2.7  BOILER SHUTDOWN

Disconnect the main selector switch (9) by 

placing it on “

” (LEDs 1 to 8 are off), 

disconnect the external omni-polar switch to 

the boiler and close the gas cock upstream of the 

appliance. Never leave the boiler switched on if 

left unused for prolonged periods.

2.8  RESTORING CENTRAL HEATING 

SYSTEM PRESSURE.

Periodically check the system water pressure. 

The boiler pressure gauge should read a pressure 

between 1 and 1.2 bar.

If the pressure falls below 1 bar (with the circuit 

cold) restore normal pressure via the valve located 

at the bottom of the boiler (Fig. 2-2).

N.B.:

 close the valve after the operation. 

If pressure values reach around 3 bar the safety 

valve may be activated.

In this case contact a professional technician 

for assistance.
In the event of frequent pressure drops, contact 

qualified staff for assistance to eliminate the 

possible system leakage.

2.9  SYSTEM DRAINING.

To drain the boiler, use the special draining 

valve (Fig. 2-2).

Before draining, ensure that the filling valve is 

closed.

2.10 ANTI-FREEZE PROTECTION. 

The boiler is equipped with an antifreeze 

function, as per standard, that activates pump 

and burner operation when the temperature 

of the water inside the boiler falls below 4°C 

and stops when it reaches 42°C. The antifreeze 

function is only guaranteed if the boiler is 

fully operative, is not in "block" status and is 

electrically powered with the main selector on 

Summer or Winter. To avoid keeping the system 

switched on in case of a prolonged absence, the 

system must be drained completely or antifreeze 

substances must be added to the heating system 

water. In both cases the boiler domestic hot 

water circuit must be drained. In systems that 

are drained frequently, filling must be carried out 

with suitably treated water to eliminate hardness 

that can cause lime-scale.

Fig. 2-2

2.11 CASE CLEANING.

Use damp cloths and neutral detergent to clean 

the boiler casing. Never use abrasive or powder 

detergents.

2.12 DECOMMISSIONING.

In the event of permanent shutdown of the boiler, 

contact professional staff for the procedures and 

ensure that the electrical, water and gas supply 

lines are shut off and disconnected. 

Bottom view.

Key:

  1  -  System draining valve

  2  -  System filling valve

  3  -  Cold water inlet valve

  4  -  Gas cock

 N.B.:   connection group (optional)