11
➢
circuits open or in short-circuit. Check :
➥
Sensor resistance
(12500
Ω
at 20 °C, 1750
Ω
at 70 °C)
➥
Disconnect the sensor from the pipe:
if the boiler starts, then the NTC
is in contact with the earth: change
the sensor.
➥
NTC possibly wet: dry it
➥
Sensor in short-circuit
or sensor insulation fault.
➥
Check the electrical connections
➥
Interface possibly wet. Dry it or replace it.
➥
Poor connection to the card
➢
This fault may be occasional :
➥
Switch OFF the boiler. Wait for 5 s
or so and try to turn it ON.
➥
If the fault persists,
change the main circuit board.
➥
Hot water NTC disconnected
➥
3-way valve seized
in heating configuration when the boiler
is set on domestic water
➥
Pump failed
➥
Low heating flow rate (radiators closed)
➥
Motor connection or motor failure
➥
Check the safety electric valve
➥
Minimum ignition voltage = 175V
➢
This fault may be occasional
and transient
➥
Otherwise, check the card.
➥
Check the position of CTN2
➥
Perform water topping-up
➥
Check the expansion vessel,
the filling cock (may be open),
the pressure sensore,
the capacity of water of the installation.
Code
Fault type
Display
Checks to be performed
06
08
09
11 or 12
13
14
15
16
17
18 or 20
19
21
22
Heating sensor loop (NTC 2)
Microfast sensor loop (NTC 3).
note : a mini-accumulator NTC
fault will not lock the boiler.
Pressure sensor loop (Cp)
User’s interface
Main card
Temperature limiter
(ensured by heating
feed NTC: (CTN2)
Step-motor failure
Gas leak through the safety
electric valves
Network voltage too low
Communication fault
CTN2 not at the right place
Lack of water in primary circuit
Too much water pressure
Summary of Contents for ThemaClassicPlus F 24 E
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