14
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.
Er 24
Boiler temperature probe
malfunction
Boiler temperature probe disconnected or not working
Er 25
Boiler water filling malfunction
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”
Er 26
Boiler emptying malfunction
- 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)
Er 27
Boiler emptying malfunction – with
tank full
Or boiler full signal on models
without rinsing pump
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
Summary of Contents for UD505DUK
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