Temperature Reading 0.0ºc , *** or 40ºC on P4

[ProfeBacterio]

Hi. I need help. I have several days in which I constantly receive these 2 alarms.

Temperatura 1 : 40.0C
Valor pH 1 : 6.64pH
Redox 1 : 553mV
Conduct.(F) 1 : 174uS
TempAire 1 : 19.4C
Humedad 1 : 71.1%
Voltaje 1 : 10.00V
Voltaje 2 : 10.00V

Alarma: Temp 1 Temperatura Cont

Temperatura 1 : ***
Valor pH 1 : 6.63pH
Redox 1 : 553mV
Conduct.(F) 1 : 227uS
TempAire 1 : 19.4C
Humedad 1 : 70.1%
Voltaje 1 : 10.00V
Voltaje 2 : 10.00V

Alarma: Temp 1 Temperatura Cont

I can not find where the problem is. it may be the P4 broken or the probe broken or it has been de-calibrated.

[MatthiasF]

The probe can react to electromagnetic interferences and errors out with a 40.0C reading.
You can try and move all electronical devices as far as possible away from the sensor/ sensor cable,
perhaps it is a disturbing lamp/ballast or there occurs randomly a short-circuit.
Maybe cable broken or something wrong in the plug.

[PiggyPuffin]

try increasing the signal filter and routing sensor cables away from power cables. That worked for me.