Kroll 25S - Malfunction and Remedy

Warning !
All work on the electrical installation must be carried out by a qualied electricien.
Pull power supply plug only when the heater has entirely cooled down.
See also operating instructions for oil-/gasburner.
Malfunction and remedy
Malfunction Possible Cause Remedy
The space heater ist connected up, but :
The heater does not start, when
the
selector switch is set to heating
a) No electrical supply
b) Defective selector switch
c) Oil-/gasburner indicates a
malfunction
d) Overheat thermostat is locked
e) Room thermostat falsely set
a) Check main switch and fuses
b) Replace selector switch
c) Reset oil-/gasburner if burner cuts
again, press reset button after 4 to
5 min.
See operating instruction for burner
d) Press reset button of overheat
thermostat
e) Check room thermostat setting
The space heater is connected up and
switched on:
The oil burner starts and
immediately indicates a
malfunction
or
the gas burner starts and
immediately indicates a
malfunction
a) No oil in the tank
b) Air in fuel circuit
c) Oil lter clogged
d) Stopcock closed
e) Oil burner indicates a malfunction
again
a) No gas pressure
a) Rell oil tank
b) Check screwed connections of fuel
circuit for leaks
c) Change lter element
d) Open stopcock
e) See operating instructions oil burner
a) Check manometer admission pres-
sure
Check if main shut-off valve are in
the „open-position“
Overheat thermostat switches off a) Defective temperature controller a) Replace warm air thermostat
Temperature controller continually
switches off
a) Temperature controller wrongly set
b) Fan does not start
c) Fuel ow rate too high
d) Recirculating air grille or air lter
inlet may be blocked (if existing as
accessories).
a) Check temperature controller set-
ting
b) Check fan motor or capacitor or
replace it if necessary, eventual
check motor protector switch and
belt drive.
c) Adjust fuel ow rate to given value.
d) Clean or exchange recirculating air
grille respectively air lter
Signal lamp at control box is on a) Burner indicates malfunction a) See operation instruction burner
The space heater is connected up,
but :
The fan does not start, when
the selector switch is set to
Ventilation
a) No electrical supply
b) Defective fan
c) Capacitor defective
a) Check main switch and fuses
b) Replace fan
c) Check capacitor
Version 400 V
The space heater is connected up,
but :
The fan does not start, when
the selector switch is set to
Ventilation
a) Motor protector switch defective
b) Belt drive loose
(if indirect drive)
a) Check motor protector switch
b) Check belt drive
The heater is connected at electric sup-
ply but does not operate
a) No electrical supply
b) has interrupt
a) Check electrical supply
b) Replace fuses
Signal lamp at control box is on a) Motor protection relay has interrupt a) Open electric control box and press
reset button at motor protection relay.
In case of repeat the motor hat to be
mecanically and electrically by a
specialist
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