Smeg UG405DSUK User Manual page 16

Boiler temperature probe
Er 24
malfunction
Boiler water filling malfunction
Er 25
Boiler emptying malfunction
Er 26
Boiler emptying malfunction – with
tank full
Er 27
Or boiler full signal on models
without rinsing pump
pressure switch is indicating full even with the boiler empty: - damaged boiler
heating element – conta ctor failure - open on boiler safety thermostat side. -
boiler temperature probe faulty or incorrectly positioned - motherboard relay
failure, Important: If the boiler heating element is damaged, this might be due
to operation with no water in the boiler, pressure switch continues to give full
reading even with boiler empty: check boiler air trap and/or relative pressure
switch and replace if necessary.
Boiler temperature probe disconnected or not working
The boiler wasn't filled in the expected time: check the water supply tap, the
dynamic supply pressure, cleanliness of the inlet water filter, any damage of
the water charging hose, or check the following in this order:
- faulty boiler pressure switch (it always detects "empty"),
- leakage or unbinding of the tube (water runs inside the tube)
- menu service wron setting "rP"
- check cleanliness of the rinse nozzles
- faulty boiler pressure switch (it always detects "full")
- leakage or unbinding of the tube (water runs inside the tube)
- rinsing pump malfunction (if present)
Faulty boiler pressure switch (it always detects "full"). If this occurs in models
without rinsing pump, the boiler pressure switch is wrongly detected: check
settings in the service menu on entry "rP"
"rp" = on for models with rinsing pump
"rp" = of for models without rinsing pump
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