69
8.5
Unscheduled maintenance
If replacing the
electronic board
, the user MUST set the parame-
ters as indicated in the table and in the sequence shown.
Settings for MUR-
ELLE HT
PAR 01
PAR 02
Index showing boil-
er power in kW and
type of boiler
Hydraulic configu-
ration and system
type
MURELLE HT 25 MET
2
1
MURELLE HT 30 MET
3
1
MURELLE HT 35 MET
4
1
MURELLE HT 25 GPL
6
1
MURELLE HT 30 GPL
7
1
MURELLE HT 35 GPL
8
1
MURELLE HT 25 E2
10
1
MURELLE HT 30 E2
11
1
MURELLE HT 35 E2
12
1
To enter "
"refer to the indica-
tions provided in the specific section.
Once the parameters in the table have been set, you must carry
out the entire phase of "
cific section.
If the
gas valve
and/or the
ignition/detection electrode
, and/or the
burner
, and/or the
fan
are replaced, the user must still carry out
the entire phase of "
specific section.
8.6
Malfunction codes and possible solutions
LIST OF MALFUNCTION/FAULT ALARMS
Type
No.
Fault
Solution
ALL
02
Low water pressure
in system
- Restore pressure
- Check for any leaks in the
system
ALL
03
High water pres-
sure in system
- Empty the system via the
drain valve on the hydrau-
lic assembly and bring the
pressure to approximately
1.2 bar
ALL
04
Domestic hot water
sensor fault (return
sensor fault for T
models)
- Check connections
- Check the sensor is working
ALL
05
Delivery sensor
fault
- Check connections
- Check the sensor is working
ALL
06
No flame detection
- Check the integrity of the
electrode and check that it is
not grounded
- Check gas availability and
pressure
- Check the integrity of the gas
valve and the card
ALL
07
Sensor or safety
thermostat inter-
venes
- Check the sensor or thermo-
stat connections
- Deaerate the system
- Check the bleed valve
- Replace the sensor or the
thermostat
- Check that the pump impel-
ler is not blocked
ALL
08
Fault in the flame
detection circuit
- Check the integrity of the
electrode and check that it is
not grounded
- Check the integrity of the gas
valve and the card
Type
No.
Fault
Solution
ALL
09
No water circulat-
ing in the system
- Check the rotation of the
pump rotor
- Check the electrical connec-
tions
- Replace the pump
ALL
10
Auxiliary sensor 1
fault
- Check PAR 02 "hydraulic
configuration"
- Check the electrical con-
nection
ALL
12
Domestic hot water
sensor fault in tank
mode
- Set the parameter PAR 04
(Combustion configuration)
to 0
ALL
13
Smoke probe inter-
vention
- Check the sensor is working
- Replace the smoke probe
ALL
14
Smoke probe fault
- Replace the smoke probe
- Check the electrical connec-
tion of the smoke probe
- Contact the Technical Assis-
tance Centre
ALL
15
Fan fault
- Check the fan rpm
- Check the electronic circuit
board
ALL
19
External sensor
fault
- Check the sensor connection
- Check the sensor is working
ALL
20
Boiler configura-
tion failure (PAR
01 and PAR 02 not
configured)
- Configure the boiler (see the
section “
ALL
28
Maximum number
of consecutive
resets reached
- Wait 1 hour and try unblock-
ing the board again
- Contact the Technical Assis-
tance Centre
ALL
30
Return sensor fault
(boiler sensor fault
for T models)
- Replace the return probe
- Check parameters
- Contact the Technical Assis-
tance Centre
ALL
31
PT1000 sensor fault
- Replace the sensor
- Contact the Technical Assis-
tance Centre
ALL
32
Auxiliary sensor 2
fault
- Check PAR 02 "hydraulic
configuration"
- Check the electrical con-
nection
ALL
37
Fault due to low
network voltage
- Check the voltage
- Contact your network
provider
ALL
40
Incorrect network
frequency detected
- Contact your network
provider
ALL
41
Flame loss more
than 6 consecutive
times
- Check the ignition/detection
electrode
- Check the gas supply (open
valve)
- Check mains gas pressure
ALL
43
Open Therm com-
munication fault
- Check the OT electric con-
nection
ALL
46
Mix zone thermo-
stat intervention
fault
- Check the mixer valve is
working
- Check the thermostat is
working
ALL
47
Mix zone sensor
fault
- Check the sensor connection
- Check the sensor is working
ALL
48
Mix zone configura-
tion fault
- Check that the system solu-
tion is correctly set (see the
section “
”)
ALL
49
Solar manifold
probe fault
- Check the sensor connection
- Check the sensor is working