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3.6 TROUBLESHOOTING
Maintenance operations must be carried out by an au-
thorised company (e.g. Authorised Technical Assistan-
ce Service).
Trouble
Possible causes
Solutions
Smell of gas
Caused by leakage from gas circuit pipeli-
nes.
Check sealing efficiency of gas intake circuit.
Repeated ignition blocks
No gas. Condensate drain clogged.
Check the presence of pressure in the network and that the gas adduction
cock is open. Restore/release the function of the condensate drain,
checking that the condensate has not affected: combustion components,
fan and gas valve. Check the function of the condensate sensor.
Irregular combustion or
noisiness
Dirty burner, clogged primary heat
exchanger, incorrect combustion parame-
ters, intake-exhaust terminal not correctly
installed.
Check the indicated components.
Frequent trips of the
overheating safety device
thermostat function.
Lack of water in the boiler, poor water cir-
culation in the system or blocked circula-
ting pump (Par. 1.27).
Check on the pressure gauge that the system pressure is within establi-
shed limits. Check that the radiator valves are not closed and also the fun-
ctionality of the pump.
Siphon blocked
Dirt or combustion products deposited in-
side.
Check that there are no residues of material blocking the flow of conden-
sate.
Condensing heat
exchanger clogged
Siphon and/or duct between condensing
exchanger and siphon clogging.
Check that there are no residues of material blocking the flow of conden-
sate.
Poor production of
D.H.W.
DHW heat exchanger clogged.
Contact Immergas After-Sales Assistance Service that has procedures to
clean the D.H.W. heat exchanger.
Red pump LED
Low power supply voltage (when the mini-
mum voltage is reached after about 2 se-
conds, the LED switches from green to red
and the pump stops).
Wait for the power supply voltage to rise; when the pump restarts, the LED
will turn green again with a delay of about one second. Note: The flow rate
decreases as the supply voltage decreases.
Rotor locked (Powering the pump with the
rotor seized, after about 4 seconds the LED
switches from green to red.
Carefully act on the screw in the middle of the head to manually release
the crankshaft; circulation starts up immediately after the rotor is relea-
sed and the LED switches from red to green after about 10 seconds.
Electrical error.
Check that there is no fault on the pump (on its wiring or electronics).
