User’s manual
Cod
e
Failure
Reason of failure
Troubleshooting
Electric circuit of thermo relay is
damaged (overheat sensor)
Check electric circuit and pins
02
Water overheating
Boiler doesn’t work*
Heating system is contaminated
Clean heating system
Failure of thermo relay (normally closed
at temperature up to 95 °С)
Replace thermo relay
Air lock in the heating system
Open air duct valve
(see p.
16.2.2.5.
, page 34)
Filter is the heating system is
contaminated
Clean the filter
Bypass valve is failed or wrong installed
Check proper installation of the
details of bypass valve and replace it
if necessary
Pump or air duct valve is failed
Replace a pump or air duct valve
Faulty pump relay on electronic board
Replace electronic board
Gas supply regulator doesn’t work
Replace gas supply regulator
Gas supply regulator is not adjusted
Adjust gas supply regulator (see
section 11, page 22)
Electric circuit of thermo relay is
damaged (overheat sensor)
Check electric circuit and pins
03
Draught absence
Boiler doesn’t operate*
Exhaust flue or air flow valve is
contaminated
Figure out a reason of contamination
and remove it
Faulty leak-tightness of air pressure
switch tubes
Replace tubes
Electric circuit of air pressure switch is
damaged
Check electric circuit and pins
Faulty air pressure switch (pins of
pressure switch should close at pressure
drop from 130 Pа)
Replace air pressure switch
Condensate in air pressure switch tubes
Remove condensate out of air
pressure switch tubes
Electric circuit of fan is damaged
Проверить электрическую цепь и
контакты
Failure of fan
Replace fan
04
Lack of water pressure in
CH
Boiler doesn’t work**
Low water pressure in CH
Make CH water pressure up to the
recommended value (see p.
10.1
,
page 19)
Air lock in the heating system
Open air duct valve
(see p.16.2.2.5. , page 34)
Failure of CH water pressure sensor
Replace a sensor
Failure of pump or air duct valve
Replace pump or air duct valve
Electric circuit between pressure sensor
and electronic board is damaged
Check connector pins in the control
block and sensor and electric circuit
of a sensor
05
Failure of CH temperature
sensor.
Boiler doesn’t work**
Failure of CH temperature sensor
Replace CH temperature sensor
Electric circuit “temperature sensor-
electronic board” is damaged
Check electric circuit and pins
06
Failure of DHW
temperature sensor Boiler
works in heating mode
only**
Failure of DHW temperature sensor
Replace DHW temperature sensor
Electric circuit between DHW
temperature sensor and electronic board
Check electric circuit and pins
