Malfunction And Remedy; Possible Cause - Kroll M25 Betriebsanleitung

Malfunction and Remedy

Warning
All work on the electrical installation
must be carried out by a qualified
electricion.
Remove power supply plug only when
the heater has entirely cooled down.
Malfunction
The space heater is connected up,
but:
the burner does not start, when the selector
switch is set to = Heating
The space heater is connected up, and swit-
ched on the oil burner starts and
immediately indicates a malfunction
Overheat thermostat switches off
Temperature controller
continually switches off
The heater is operating, but is producing
smoke
The warm air fan continues to run although it is
switched off and has cooled down
The burner runs, but the warm air fan does not
start after a short period
The space heater is connected up,
but:
The fan does not start, when
the selctor switch is set to
See also operating instructions for oil burner.
The incorrect adjustment of the burner may destroy the combustion chamber and heat exchan-
ger; therefore it is important that the output is correctly set. In order to avoid condensation, the
net temperature of the flue gases (= the measured temperature of the flue gases in °C minus
the inlet temperature of the burner in °C must drop below a value of 160°C. The burner readjust-
ment must be carried out by a specialist (after-sales service for burner). The flames must on no
account touch the walls of the combustion chamber.

Possible cause

a) No electrical supply
b) Defective selector switch
c) Oil burner indicates a malfunction
d) Motor or capacitor defective
e) Overheat thermostat is locked
f) Room thermostat falsely set
a) No oil in tank
b) Air in fuel circuit
c) Oil filter clogged
d) Stopcock closed
e) The oil in the storage tank is jellied
f) Oil burner indicates a malfunction again
a) Defective overheat thermostat
a) Temperature controller wrongly set
b) Fan does not start
c) Fuel flow rate too high
a) Nozzle is blocked
b) Filter is clogged
c) Water is in the fuel oil
d) Paraffin precipates in the main filter
because there is no oil preheating
e) Not enough fuel in the tank
f) Air sucked in through leaky points
g) Defective solenoid valve
a) Defective temperature controller
b) Temperature regulator set to low
a) Defective temperature regulator
b) Temperature regulator set too low
c) Warm air fan or capacitor defective
a) No electricity supply
b) Overheat thermostat is locked
c) Capacitor defective
= Ventilation
Remedy
a) Check main switch and fuses
b) Replace selector switch
c) Reset oil burner. Burner cuts again, press
reset button after 4 to 5 min.
Fault clearance of oil burner.
If there is another shut-down of the burner
on fault, press reset button once again 4-5
minutes later (see also operating instruc-
tions of the burner) After having pressed the
reset button at the burner control twice,
search for cause of trouble by
consulting the operating instructions –
if you do not succed, call for customer
service.
d) Check motor or capacitor or replace
if necesary
e) Press reset button of overheat thermostat
f) Check room thermostat setting
a) Refill oil tank
b) Check scewed connections of fuel circuit for
leaks
c) Change filter element
d) Open stopcock
e) Activate oil preheating in the tank and
insulate the lines
f) See operating instructions oil burner
a) Replace warm air thermostat
a) Check temperature controller set
b) Check fan motor or capacitor or replace it if
necessary
c) Adjust fuel flow rate to given value
a) Replace nozzle
b) Clean the filter or renew it
c) Renew fuel oil
d) Replace oil preheater
e) Fill up the tank
f) Tighten screw joints in the oil line, replace if
necessary
g) See operating instructions oil burner
a) Replace the warm air thermostat
b) Correct the temperature adjustment
a) Replace the warm air thermostat
b) Correct the temperature adjustement
c) Replace warm air fan or capacitor
a) Check main switch and fuses
b) Press overheat thermostat reset button
c) Check capacitor
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