HDS Middle Range / HDS Premium Range
Basic Settings and Service Procedures
Service Manual 04.2008
Page 89 / 127
Exhaust thermostat has tripped
Display
Note
Explanation
Cable break or short circuit in temperature sensor
Clear soot from boiler
Check exhaust thermostat
Check temperature sensor
Flame sensor did not detect a flame although the
burner was switched on
Clean inspection glass
Check fuel supply
Flame sensor detected light, although the burner was
off
External incident light at the flame
sensor
Scale in combustion chamber
Solenoid valve does not close
RFID read-write electronics are defective.
Check RFID read-write electro-
nics, replace
Cable break has occurred in fuel level sensor
Check fuel level sensor
Cable break has occurred in cleaning agent 1 level
sensor
Check RM1 level sensor
Cable break has occurred in cleaning agent 2 level
sensor
Check RM2 level sensor
Software version 1.1
This is not a fault.
Error appears for
design reasons only because
the display is in Error menu.
11
3.2.10 Operating hours
„Control ON“ operating time
Display
Note
Explanation
75 °C
12 544h
3.2.9 Fault memory
70 °C