Profilux temperature stuck at 20C

[Antti Ellonen]

I have a Profilux II Plus and PT 1000 temperature sensor. The sensor shows temperature of +20.0C +-0.3C regardless of what the temperature actually is. I've placed the sensor in hot water and cold water and the temperature is always between 19.7-20.3C. I bought the item used a few months back and it worked normally for the previous owner. I thought the sensor might have broken when I moved it in and bought a new one, but it shows exactly the same temperature! Is it my Profilux that is actually broken, or is there some other explanation for this "getting stuck at about 20C"?

Recalibrate? Return factory settings? What should I try?

[Antipodes]

I believe this is the default if the profilux does not recognise if a probe is installed.
The socket on the ps2 plug is very problematic and on some is quite loose. This has caused issue with some people. Just wiggling the plug can connect/disconnect!
On others they have had to make sure the plug is pushed in firmly.
It could be a broken wire in the cable, but as you have 2 probes I don't think this would be it?

[Antti Ellonen]

Ok, I think the Profilux control unit is to blame. I tried wiggling the plug, but the only temperature readings I get are either +40C (if disconnected) or +20C (if connected), with both the old and the new sensor. What can I do to solve this? Just buy a new control unit? Any cheaper options available?

[PIWAWT]

Have you recalibrate the sensor at the PL2?
(Sensor Settings/Temperature)
from the Programming Guide:
Temperature sensor
This calibration function depends on the fact if it is an internal (onboard) temperature sensor input.
Internal (onboard) temperature sensor input
The factory calibration is restored and a possibly existing compensation for a cable extension (see 2.17 Extension) is
reset – ProfiLux then assumes that there is no extension cable.

[ScottF83]

Ok, I think the Profilux control unit is to blame. I tried wiggling the plug, but the only temperature readings I get are either +40C (if disconnected) or +20C (if connected), with both the old and the new sensor. What can I do to solve this? Just buy a new control unit? Any cheaper options available?Sorry to dig up an old thread but I am having a similar issue with my Profilux 3 whereby the reading is either 20c if the probe is disconnected or 40c if connected

I was having trouble connecting to the control centre so I unplugged everything and took the unit to my PC to connect via USB. Whilst connected, I updated the firmware and everything looked okay.

Plugged all the connections back in at the aquarium, and now the temperature sensor doesn't work and the display is unreadable (very pale). The pins are all okay and nothing changed or damaged.

I've tried setting the display to 100% for day and night, I've tried a factory reset and also a temperature recalibration via the remote control feature on the PC.

All failed to fix the display or temperature reading

What else can I try?

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