________________________________________________________________________________
64
AST 14 C 258/00
Flow probe failure
(E05):
the burner switches off immediately and the fan runs at
the ignition power.
The pump runs until the fault is removed, with the diverting valve in the heating
position if before the fault there was a request for heating, flow-return anti-freeze or
chimney-sweep, or there were no request at all.
The pump runs with the diverting valve in the DHW position only if before the fault
there was a request during DHW or anti-freeze operation.
With P17=1 and P17=3 (multifunction relay), the relay remains energised until the
fault is removed if there was a request for heating, flow-return anti-freeze, chimney-
sweep, or there were no request at all.
Return probe failure
(E15):
the burner switches off immediately and the fan runs at
the ignition power.
The pump runs until the fault is removed, with the diverting valve in the heating
position if before the fault there was a request for heating, flow-return anti-freeze or
chimney-sweep, or there were no request at all. The pump runs with the diverting
valve in the DHW position only if before the fault there was a request during DHW
or anti-freeze operation.
With P17=1 and P17=3 (multifunction relay), the relay remains energised until the
fault is removed if there was a request for heating, flow-return anti-freeze, chimney-
sweep, or there were no request at all.
Plate DHW probe failure
(E06)
: when there is a request for operation on DHW
mode, the burner does not activate (it switches off, if it is ON). The pump activates
for as long as the request continues, after which (and without any further requests),
it performs a 30-second post-circulation cycle, which is performed even without any
operation request. When there is a request for operation on heating, flow anti-freeze
or chimney-sweep mode, the request is normally handled.
The system resumes normal operation when the fault is eliminated.
The table below shows the resistance values (
Ω
) of the flow, return, DHW and tank
heater NTC probes at the various temperatures.
Probe calibration:
10k Ohm at 25°C
T °C
0 2 4 6 8
0
27203 24979 22959 21122 19451
10
17928 16539 15271 14113 13054
20
12084 11196 10382 9634 8948
30
8317 7736 7202 6709 6254
40
5835 5448 5090 4758 4452
50
4168 3904 3660 3433 3222
60
3026 2844 2674 2516 2369
70
2232 2104 1984 1872 1767
80
1670 1578 1492 1412 1336
90
1266 1199 1137 1079 1023
Correct operating range:
from -20 to +120°C, general tolerance
:
+3°C.
