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Observed fault Possible cause Remedy
• Heater does not start. • Faulty electrical supply. • Check function and positioning of mains switch.
• Check mains
• Check electrical connections.
• Check fuses.
•
Wrong positioning of mains switch
• Set on right position.
• L thermostat cuts in. • See instruction relative to L thermostat.
• Check oil flow.
• Make sure no additional air ducts restrict air flow.
• Remove dirt or foreign particles from air outlet.
grilles, louvres or ducts.
• Wrong setting of eventual • Check positioning of thermostat and correct.
room thermostat. • Check if thermostat is functioning properly.
• Thermal relay RM cuts • Fan motor current • Heater with helicoidal ventilation: remove eventual
in (Warning lamp (10) absorption excessive debris preventing free flow of air on intake and
lights up) outlet. Check length of air ducts, recluce if excessive.
• Heater with centrifugeal ventilator: check setting of
transmission belt as indicated in chapter
“CONNECTION TO HOT AIR DUCTS”
• Always check that current absorption remains below
value indicated on motor manufacturer plate.
• Thermostat L2 cuts in • Excessive combustion • Check as indicated above.
(Warning lamp (9) chamber over heating. • If fault persists contact our service center.
lights up)
• Burner motor starts but • Bad functioning of burner. • Read burner instructions.
does not ignite.
• Ventilator does not start • No electrical current. • Check fuses.
or starts late. • Reset thermal relay.
• F thermostat out of order. • Check thermostat, set or replace
• Motor winding faulty. • Replace fan motor.
• Burned out condenser. • Replace condensor.
• Blocked motor bearings. • Replace bearings.
• Noise and vibrations • Dirt or foreign particles • Remove foreign particles.
from ventilators. of fan blades.
• Restricted air circulation. • See previous instructions.
• Insufficient heat. • Wrong burner. • Reed burner instructions.
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