Installation manual

34
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 fulfilled, 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
Electrnic igniter defective
Check air inlet duct and 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
F9 Water 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
F13 Main board connection
fault
Main board defective
Check connection and wires
F16 Flame detection fault
(flame presence for more
than 5 seconds after
burner stopped)
Gas valve defective
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 Water circulation fault Possible pump failure
F26 Maximum delta
temperature (flow - return)
Water circulation fault
Check central heating flow and return connection
F28 Permanent drift between
flow sensor and return
sensor
Check central heating flow and return thermistor connection
Thermistor defective
F29 Thermal fuse Replace the heat exchanger