Table of Contents
Advertisement
14.2 Other failures
Failures that do not have an error code shown on the boiler's display, are shown in Table 5:
Table 5
Failure
Lack of electricity
Fuse is burnt
Heat carrier or water entry on the
Boiler doesn't switch on
electronic board
Electronic board failure
(RESET doesn't help)
Minimal gas pressure and ignition
power are wrong adjusted
Insufficient air supply
Claps in the burner
Electrode spark of ignition plug slips
on the edge of burner section or the
shell of combustion chamber
Burner block is contaminated
Smell of gas
Gas leakage
Insufficient inlet DHW water
pressure
Little hot water output
or its absence
Water filter is contaminated
High incoming water temperature
Set water temperature
is not maintained (too
high)
Little water flow through DHW
circuit
The boiler is nor
No plug wire in the room thermostat
operating in the
Room
heating mode (Bur is
connecting contacts 28 and 29 is out
operating in the DHW
of order (see Annex III, page 66)
mode)
Failure of room thermostat (if it is
installed)
Inlet water temperature
in the heating system is
Failure of CH temperature sensor
lower than the set one
Boiler is in stand-by
mode, a symbol«- -» is
Power voltage is over 190 ÷ 250 V
displayed but boiler
doesn't react to the
pressed control buttons
Reason of failure
User and technical staff manual
Secondary heat exchanger is
contaminated
thermostat's
plug
wire
35
Troubleshooting
Address to the electricity service
Replace the fuse on the board
Dry the board by means of warm air or leave
it for 2 days in a dry place for full ware
evaporation
De-energize and re-start boiler
Replace the electronic board
Adjust minimal gas pressure (see p. 11.4,
page 26) and ignition power "P0" (see p.
13.3.1, page 30)
Clean the tube or air inlet duct
Bend the ignition plug or shell of
combustion chamber allowing a spark to slip
on the aperture area of the nozzles of burner
section
Clean the burner block (see p. 16.1.1, page
37)
Check the whole gas circuit for air-
tightness (see p.8.2, page 14), remove gas
leakage
Address to the Housing and Public utilities
service
Clean the filer on the DHW line
Clean the heat exchanger (see p. 16.1.3,
page 38)
Increase water flow through the DHW or
dilute hot water with cold water not
permitting reduction of water flow through
the DHW circuit
Increase water flow through DHW
Install the plug wire into the room
thermostat
Replace the room thermostat's plug wire
Replace a room thermostat
Replace the temperature sensor
Restore power voltage in range 190 ÷ 250
V. Within 30 seconds the boiler will be
launched automatically in the previous
mode that boiler was in before the power
voltage went out of the range 190 ÷ 250 V
Advertisement
Table of Contents
