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OBSERVED FAULTS, POSSIBLE CAUSES AND REMEDIES
Observed fault
• The heater won't start
• Thermostat L cuts in
(warning light (8) lights up)
• Thermal relay RM cuts in (warning light (9)
lights up)
• The burner starts up, the flame doesn't light up
and the restart light comes on
• The fan doesn't start up or starts up late
• The fan vibrates or makes unusual noise
• Not enough heat
Cause
• Faulty electrical supply
• Wrong positioning of main switch
• Wrong setting of room thermostat
• Safety device (burner, thermostat L, Thermal
relay) not restarted after repairs
• The combustion chamber has overheated
• Fan current absorption is excessive
• Burner not working correctly
• No electrical power
• F thermostat out of order
• Winding of motor burnt or interrupted
• Condenser burnt
• Motor bearings blocked
• Extraneous material on fan blades
• Not enough air circulation
• Drive belt loose or not aligned
• Wrong burner
18
Remedy
• Check function and positioning of main switch
• Check power cord
• Check electrical connections
• Check fuses
• Put main switch in correct position
• Check setting of room thermostat
• Check function of room thermo-stat
• Press the appropriate restart button
• Check fuel flow
• Check position registers, draw-holes, etc.
• Remove extraneous material from air ducts and
ventilation grills
• Increase air flow adjusting transmission
between motor and fan
• Adjust transmission between motor and fan
• Press the restart button to turn on the heater. If
the same problem arises again call an Authorized
Service Technician
• Check fuses
• Check electrical connections
• Check the thermostat, set it and replace it if
necessary
• Replace the fan motor
• Replace the condenser
• Replace the bearings
• Remove extraneous material
• Remove obstacles to air circulation
• Adjust drive belt tension
• Call an Authorized Service Technician
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