FAULT FINDING
29
LOGIC HIU
-
Installation & Servicing / Users
61 FAULT FINDING
Fault
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
restore correct connection
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 worlcing
contact person in charge of system
CH LED off
timer/thermostat time setting incorrect
check programming of timer/thermostat
timer/thermostat not working
check timer/thermostat
all LEDs are off
electric supply switched off
restore HIU electric supply
protection fuse burnt out
restore HIU electric supply
FAULT led lit
+error code
4 active
heating circuit pressure too low
restore system pressure
FAULT led lit
+error code
5 active
heating temperature probe faulty
call qualified personnel to have it replaced
FAULT led lit
+error code
15 active
compensation temperature probe faulty
call qualified personnel to have it replaced
FAULT led lit
+error code
69 active
safety thermostat cut in
call qualified personnel to have it serviced
FAULT led lit
+error code
76 active
safety relief valve faulty
call qualified personnel to have it serviced
FAULT led lit
+error code
79 active
incorrect switch setting
restore correct switch settings