22
FAULT DESCRIPTION
ALERTS
POSSIBLE CAUSE OF FAULT
OPERATIONS TO BE PERFORMED
Domestic hot
water is not
heated
blinking
icon
primary circuit shut-off valves closed
open the valves
modulating valve actuator disconnected from valve body
reconnect actuator
modulating valve actuator faulty
call qualified personnel to have it replaced
DHW temperature probe cable inverted with heating probe
restore correct connection
presence of air in the system
vent the system
electronic regulator not working
call qualified personnel to have it replaced
valve obturator blocked in closed position
call qualified personnel to have it replaced
centralised system not working/cold
contact person in charge of system
error code 6 active
DHW temperature probe disconnected
reconnect probe
DHW temperature probe faulty
call qualified personnel to have it replaced
error code 80 active
incorrect wiring/no credit
check electrical connections/top up credit
fixed
icon
DHW priority flow meter disconnected
reconnect flow meter
DHW priority flow meter faulty
call qualified personnel to have it replaced
icon
absent
DHW production not enabled
enable DHW production by means of HIU
interface
display is off
electric supply cut off
restore HIU electric supply
protection fuse burnt out
call qualified personnel to have it replaced
The water is hot
but does not
reach the
desired
temperature
blinking
icon
domestic water cycle temperature set point too low
increase set point
primary return temperature limitation intervention
change the return temperature set
point/disable the function
primary circuit strainer of the HIU clogged
call qualified personnel to have it serviced
exchanger partly clogged
call qualified personnel to have it serviced
modulating valve actuator faulty
call qualified personnel to have it replaced
DHW temperature probe cable inverted with heating probe
restore correct connection
excessive demand for DHW
decrease demand
electronic controller not working
call qualified personnel to have it replaced
centralised system temperature insufficient
contact person in charge of system
primary circuit flow rate insufficient
contact person in charge of system
primary flow rate limit too low
contact person in charge of system
Hot water
temperature is
too high
blinking
icon
domestic water cycle temperature set point too high
decrease set point
DHW temperature probe cable inverted with heating probe
restore correct connection
modulating valve actuator faulty
call qualified personnel to have it replaced
valve obturator blocked in intermediate or open position
call qualified personnel to have it replaced
electronic regulator not working
call qualified personnel to have it replaced
primary circuit excessive flow rate due to DPCV valve
malfunction
call qualified personnel to have it replaced
Antilegionella cycle in progress
contact person in charge of system
Hot water flow
rate is
insufficient
blinking
icon
HIU strainer clogged
call qualified personnel to have it serviced
possible domestic water system shut-off valves
partially closed
open the valves
insufficient pressure in centralised domestic water circuit
call qualified personnel to have it serviced
Hot water flow
rate is zero
-
possible domestic water system shut-off valves closed
open the valves
no cold water in centralised domestic circuit
call qualified personnel to have it serviced
HIU strainer completely clogged
call qualified personnel to have it serviced
exchanger completely blocked
call qualified personnel to have it serviced
Troubleshooting
