I-76
B-070343_EN • B
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Troubleshooting
Problem
Cause(s)
Solution(s)
Boiler does not start
No power supply
1. Check that the power button is in ON
position (pushed in and illuminated)
2. Make sure the power supply cable is
connected to the mains
3. Check the external power supply box
(circuit breaker) and reset it as required.
Boiler display remains blank
No power supply
1. Check wiring connection.
2. Check wiring continuity.
3. Replace wiring.
Main board fuse(s) blown
Replace blown fuse(s) on electronic board
(T6 3AH 250V).
Circulating pump does not start
Pump power supply
1. Check wiring connection.
2. Check wiring continuity.
3. Replace wiring.
Relay malfunction
1. Check the relay.
2. Replace the electronic board.
Pump malfunction
1. Reset the pump.
2. Check if there is voltage at the pump. If
there is, replace the pump.
Gas smell
Leak in gas circuit
1. Check tightness of connections and circuit.
2. Check that pressure measuring points
are closed.
Unburned gas smell
Leak in fl ue gas circuit
1. Check tightness of connections.
2. Check there are no obstructions in the
fl ue system.
3. Check the quality of combustion.
Irregular combustion
Wrong combustion settings
Check the values with a gas analyser and
readjust as required.
Combustion air circulation
Check that the air openings are not blocked.
Burner and combustion chamber
condition
Check if they are clean.
Heat exchanger fi re tubes are
blocked
Check if condensate outlets are not ob-
structed. Clean as required.
Fan malfunction
1. Check if fan is working.
2. Check wiring connections
3. Check wiring continuity
4. Check if there is voltage at the fan. If
there is, replace the fan.
5. Verify signal cable connection
Hard ignition
Wrong size of fl ue and/or combus-
tion air ducts.
Check duct sizes and correct as required
Wrong combustion settings
Check the values with a gas analyser and
readjust as required.
Ignition electrode malfunction
Check the condition and distance at stem
tips (3 +/- 0.5 mm between tips)
