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FL 24 MCA
Fault
Fault
Possible cause
code
Delivery sensor or DHW sensor
A41
Sensor positioning
detached from the pipe
F42
Heating sensor fault
Sensor damaged
No system H
F43
Exchanger protection trips.
Air in the system
Modulating Operator wiring discon-
nected
F50
Gas valve fault
Faulty gas valve
5. TECHNICAL DATA AND CHARACTERISTICS
Table. 3 - Key of figures cap. 5
7 Gas inlet
8 DHW outlet
9 Cold water inlet
10 System delivery
11 System return
14 Safety valve
19 Combustion chamber
22 Burner
27 Copper exchanger for heating and hot water
32 Heating circulating pump
36 Automatic air vent
37 Cold water inlet filter
38 Flow switch
39 Water flow limiter
42 DHW temperature sensor
5.1 General view and main components
126
78
278
81
22
194
95
290
10
42
8
fig. 13 - General view FL 24 MCA
Cure
Check the correct positioning and opera-
tion of the sensors
Replace the sensor
O circulation
Check the circulating pump
2
Vent the system
Check the wiring
Check the gas valve and replace it if nec-
essary
44 Gas valve
56 Expansion tank
72 Room thermostat (not supplied)
74 System filling cock
78 Anti-backflow device
81 Ignition and detection electrode
95 Diverter valve
114 Water pressure switch
126 Fume thermostat
138 External probe (not supplied)
139 Remote Timer Control (optional)
194 DHW water exchanger
241 Automatic bypass
278 Double sensor (Safety + Heating)
290 Antiwind grille (optional)
44
7
39
9
38
74
11
32
37
cod. 3541F131 - Rev. 01 - 03/2018
5.2 Water circuit
278
95
241
42
10
278
56
27
95
19
241
42
14
36
114
10
27
114
194
38
8
9
11
fig. 14 - Heating Circuit
27
114
194
38
8
9
11
fig. 15 - DHW Circuit
EN
56
36
14
32
74
56
36
14
32
74
7
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