27
FAULT-FINDING CHART
1 NO IGNITION
2 CRACKLING
IGNITION
3 SMELL OF
GAS
4 SMELL OF
UNBURNT
GAS
AND BAD
BURNER
COMBUSTION
5
CONDENSATION
IN THE
BOILER
6 COLD
RADIATORS
IN WINTER
7 POOR HOT
WATER
SUPPLY
FAULT CAUSE REMEDY
A. Gas cock closed
B. “Off” button locked
C. No flame detection
D. No ignition spark
E. Air inside pipes
F. Safety thermostat intervention
G. Water not circulating
H. Boiler water temperature higher
than figure set on the regulation
hermostat
A. Open gas cock
B. Reset by pressing
C. Neutral and phase inverted
D. Call technical service
E. Repeat ignition
F. Press reset button
G. Adjust boiler pressure and check
circulating pump
H. Adjust thermostat setting on desired
temperature.
A. Irregular flame
B. Insufficient or wrongly adjusted gas
delivery
A. Call technical service
B. Call technical service
A. Leak in pipes circuit (inside and
outside boiler)
A. Check for possible leaks in the external
and external pipes.
Call technical service
A. Flue section or height with joint not
suitable for the boiler
B. Excessive gas consumption -
combustion state is imperfect
C. Flames tend to move away
D. Flames have yellow tips
A. Replace unsuitable components.
B.
Adjust gas delivery on the modulating device.
C. Check/adjust gas valve pressure
stabilizer
D. Check that air volutes and Venturi
cones of the burner are clean.
If items A-B-C-D have been checked
with negative result call technical
service
A. Flue section or height not suitable
(excessive size)
B. Boiler operating at low temperature
A. Replace unsuitable components.
B. Adjust boiler thermostat at a higher
temperature and check if air intake
pipe/flue exhaust connection is
correct.
A. Summer-winter switch in summer
position
B. Room thermostat adjusted too low or
faulty
C. System or radiators closed
D. Circulating pump blocked
E. 3-way valve faulty
A. Place it in winter position
B. Adjust thermostat at a higher tempera-
ture or replace it.
C. Check if system gate valves and
radiator cocks are opened.
If item C has been checked with negative
result call technical service
D. Unblock with a screwdriver and check
electrical supply
E. Check electricity sypply
A. Priority thermostat temperature set too
low
B. 3-way valve faulty
A. Adjust priority thermostat at a higher
temperature or replace it
B. Check for correct power supply and
correct positioning of valve body