Installation manual

36
10 Fault finding
You will find the list of some fault codes in
the operating instructions.
The faults described in this chapter should
be carried out by a skilled professional
and if need be by SAUNIER DUVAL’s After
Sales Service.
Important: a central heating system cannot
operate efficiently if it is not filled with
water and if the air it contains at first has
not been completely removed. If those
requirements are not fulfi
lled, some noise
originated by the water boiling inside the
boiler and noise of water chute inside the
radiators could appear.
Code Description Possible cause
F1, F4
Ignition fault, boiler fialed to
light
No
gas / Insufficient gas
Incorrect gas valve adjustment
Electrode ignition lead defect
Electronic igniter defective
Check air inlet duct
Check connections to igniter unit
F5
Overheat fault
Overheat stat operated
Maximum temperature exceeded
Check thermistor connections
Air in system with thermistor at maximum setting
Faulty overheat stat connection
F6
Central
heating flow thermistor
fault
Thermistor
cable defective/broken
Thermistor faulty
Check that thermistor attached correctly to pipe
F7 DHW
thermistor fault
F8 T
ank thermistor fault
F9 W
ater pressure sensor fault
Faulty sensor connection
Check wiring
F10
Central
heating return
thermistor fault
Thermistor cable defective/broken, thermistor faulty
Check that thermistor attached correctly to pipe
F11 User interface connection fault
Check wiring between mainboard and user interface
F12 Main
board connection fault
F13 Main
board connection fault Check connection and wires
F14 Central
heating flow T° > 95°C
System fault / Possible pump failure
Check thermistor on flow
F16
Flame
detection fault (flame
presence for more than 5
seconds after burner stopped)
Gas valve defective
F17
Power
supply is less than
170V
Check
electrical supply / polarity
F18 User
interface fault Faulty user interface
F19
Central
heating thermistor
unplugged
Thermistor
cable defective/broken, thermistor faulty
Check that thermistor attached correctly to pipe
F20 Software
incompatibility
Incorrect user interface or main board
Incorrect product code
F23 W
ater circulation fault Possible pump failure
F26 Maximum
delta temperature
Water circulation fault
Check central heating flow and return connection