15
FAULT DESCRIPTION
INDICATIONS
POSSIBLE CAUSE OF FAULT
OPERATIONS TO BE PERFORMED
The room
is not reaching
the desired
temperature
CH LED on
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
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 (if present) not working
call qualified personnel to have it
replaced
pump cable (if present) 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 controller 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
CH LED off
chrono-thermostat time setting incorrect
check programming of chrono-
thermostat
chrono-thermostat not working
check chrono-thermostat
all LEDs are off
Electric supply cut off
restore HIU electric supply
Protection fuse burnt out
call qualified personnel to have it
replaced
FAULT LED on + error
code 5 active
heating temperature probe faulty
call qualified personnel to have it
replaced
FAULT LED on + error
code 15 active
compensation temperature probe faulty
call qualified personnel to have it
replaced
FAULT LED on + error
code 69 active
safety thermostat cut-out
call qualified personnel to have it
serviced
FAULT LED on + error
code 76 active
safety relief valve faulty
call qualified personnel to have it
serviced
FAULT LED on + error
code 79 active
incorrect switch setting
restore correct switch setting
FAULT LED on +
error code 80 active
incorrect switch setting
restore correct switch setting
Start-up of the
heat interface
unit heating
function triggers
the safety circuit
breaker
All LEDs are off
pump connector inserted the wrong way round
check that the pump cable connector is
inserted the right way round
