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Saunier Duval Thema CONDENS F 18 E SB Instructions For Use Installation And Servicing: Fault Finding

Condensing boiler + instantanious hot water.
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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.
Code
Description
F1, F4
Ignition fault, boiler fialed
to light
F5
Overheat fault
F6
Central heating flow
thermistor fault
F7
DHW thermistor fault
F9
Water pressure sensor
fault
F10
Central heating return
thermistor fault
F11
User interface connection
fault
F13
Main board connection
fault
F16
Flame detection fault
(flame presence for more
than 5 seconds after
burner stopped)
F18
User interface fault
F19
Central heating thermistor
unplugged
F20
Software incompatibility
F23
Water circulation fault
F26
Maximum delta
temperature (flow - return)
F28
Permanent drift between
flow sensor and return
sensor
F29
Thermal fuse
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.
Possible cause
No gas / Insufficient gas
Incorrect gas valve adjustment
Electrode ignition lead defect
Electrnic igniter defective
Check air inlet duct and connections to igniter unit
Overheat stat operated
Maximum temperature exceeded
Check thermistor connections
Air in system with thermistor at maximum setting
Faulty overheat stat connection
Thermistor cable defective/broken
Thermistor faulty
Check that thermistor attached correctly to pipe
Faulty sensor connection
Check wiring
Thermistor cable defective/broken, thermistor faulty
Check that thermistor attached correctly to pipe
Check wiring between mainboard and user interface
Main board defective
Check connection and wires
Gas valve defective
Faulty user interface
Thermistor cable defective/broken, thermistor faulty
Check that thermistor attached correctly to pipe
Incorrect user interface or main board
Incorrect product code
Possible pump failure
Water circulation fault
Check central heating flow and return connection
Check central heating flow and return thermistor connection
Thermistor defective
Replace the heat exchanger
34

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