23
F
AULT DESCRIPTION
A
LERTS
P
OSSIBLE CAUSE OF FAULT
O
PERATIONS TO BE PERFORMED
The room
does not reach
the desired
temperature
blinking
icon
heating cycle temperature set point too low increase set point
chrono-thermostat temperature setting incorrect check programming of chrono-thermostat
HIU strainer clogged call qualified personnel to have it serviced
primary return temperature limitation intervention (the
following icon appears )
change the return temperature set
point/disable the function
primary flow rate in heating mode set at an excessively
low limit
change heating valve opening limit
heating valve actuator faulty call qualified personnel to have it replaced
heating valve obturator blocked call qualified personnel to have it replaced
modulating valve actuator connector disconnected reconnect actuator connector
DHW temperature probe cable inverted with heating probe restore correct connection
presence of air in the system vent the system
pump not working call qualified personnel to have it replaced
pump cable not connected restore connection
possible system shut-off valves/terminals closed open the valves
centralised system temperature insufficient contact person in charge of system
electronic regulator not working call qualified personnel to have it replaced
primary circuit flow rate insufficient contact person in charge of system
centralised system not working contact person in charge of system
thermostat function enabled on the remote user interface
when it should be disabled
contact person in charge of system
fixed
icon
chrono-thermostat time setting incorrect check programming of chrono-thermostat
chrono-thermostat not working check chrono-thermostat
thermostat function disabled on the remote user interface contact person in charge of system
display is off
Electric supply cut off restore HIU electric supply
Protection fuse burnt out call qualified personnel to have it replaced
icon
absent
Heating not enabled (summer mode)
enable heating by means of heat interface
unit
error code 4 active
heating circuit pressure too low restore system pressure
error code 5 active
heating temperature probe faulty call qualified personnel to have it replaced
error code 15 active
compensation temperature probe faulty call qualified personnel to have it replaced
error code 38 active
external temperature probe faulty/not connected call qualified personnel to have it replaced
error code 69 active
safety thermostat cut-out
press the reset button/call qualified
personnel to have it serviced
error code 80 active
no credit top-up prepaid system
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