AFG GSM620-G Handbuch Seite 51

AfG
Err24 Boiler temperature probe malfunction
Err25 Boiler water filling malfunction
Err26 Boiler emptying malfunction
Boiler emptying malfunction – with tank
Err27
full
Err28 Boiler heating malfunction (overheating)
GSM620-G
- 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 - the pressure switch is
indicating full even with the boiler empty: check
and if necessary replace the boiler air trap and/or
the relative pressure switch: the problem is
generally preceded by "boiler overheating E28"
Boiler temperature probe disconnected or not
working
The boiler does not fill within the allowed time:
check water intake tap, dynamic pressure in intake
system, cleaning of water intake filter, possible
damage to water intake hose
Or check in this order:
- boiler pressure switch has failed (continuous
empty reading)
- pipe leaking/disconnected (water entering pipe)
- check that rinsing spray arm nozzles are clean
- boiler pressure switch has failed (continuous full
reading)
- pipe leaking/disconnected (water entering pipe)
- rinsing pump not working
Boiler pressure switch has failed (continuous full
reading)
First check:
- boiler pressure switch has failed (continuous full
reading)
- pipe leaking/disconnected: water entering pipe
connected to air trap, pressure switch continues to
give full reading even with boiler empty, heating
element operating dry
Or:
- circuit board relay failure, or
- contactor failure
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