35
TECHNICAL ASSISTANCE SERVICE
FAULT
CAUSE
CORRECTIVE ACTION
The boiler does not start up,
but there is no error signal.
Transfer pump auxiliary control
safety thermostat has tripped
Make sure that the multi-compart-
ment zone water circuit has been
correctly bled.
Check that the transfer pumps
are functioning correctly.
Check that the transfer pump
control thermostat or bithermostat
is functioning correctly.
Check the functioning of the auxil-
iary control safety thermostat
Air in the circuit
The boiler has reached the set
temperature but the radiators are
still cold
Bleed the circuit
Pump malfunctioning
Check/unseize the pump
Problem with minimum tempera-
ture thermostat (if present)
Check the temperature setting
Fumes escaping into the air
There is a smell of fumes
Clean the boiler body
Clean the flue gas pipes
Check that the boiler, flue gas pipes
and stack are all properly sealed
Check that the boiler, flue gas pipes
and stack are all properly sealed
Circuit pressure too high
The safety valve keeps
opening
Check the circuit pressure
Check pressure reducer functioning
Check pressure reducer setting
Problem with heating system
expansion vessel
Check the efficiency of the
expansion vessel