OP2 Outdoor Temp Sensor (31A00-8) reading 35F too high

[firepuppy]

So I had such good results posting my PSC05 problem I thought I'd give the forum another go:
 
My Outdoor sensor has been consistently reading 35deg(F) above actual for at least 2 years; I finally decided it must be the sensor and ordered a new 31A00-8 last week and was REALLY disappointed when I installed it yesterday and saw the same issue.  It's wired to Zone 15 input; I noticed there's no pulldown resistor on that input; is that correct?
 
I did search the forum and elsewhere but couldn't find anyone else having a similar problem;
any thoughts?
 

 

[picta]

So I had such good results posting my PSC05 problem I thought I'd give the forum another go:
 
My Outdoor sensor has been consistently reading 35deg(F) above actual for at least 2 years; I finally decided it must be the sensor and ordered a new 31A00-8 last week and was REALLY disappointed when I installed it yesterday and saw the same issue.  It's wired to Zone 15 input; I noticed there's no pulldown resistor on that input; is that correct?
 
I did search the forum and elsewhere but couldn't find anyone else having a similar problem;
any thoughts?

Is it configured as ER Outdoor Temperature zone?

 

[pete_c]

Here have had an HAI temperature sensor outside for over 10 years.  The last 5 years it was never very accurate so replaced it with a new one last year.    It is working fine but a tad slow compared to the 1-Wire cabled DS18B20 sensor.
 
Have multiple temperature and temperature/humidity sensors inside of the house and these have been fine over 10 years. (each sensor uses a different zone).
 
Note that the combo temperature and humidity sensors utilize 4 wires.  1 wire for the temperature sensor to one zone and another for the humidity sensor to another zone and a 12 VDC wire to the panel.
 
There is no pull down resistor on these.  The temperature sensor has a  little pot on it to calibrate the sensor.
 
Test the combo sensor with a short 22/4 cable wired to the panel.  If it works then its your wiring to the outdoor sensor.  If it doesn't work then return it to the seller.
 
Choices on PCA are: 
 
1 - ER Outdoor Temp, ER Temp alarm, ER Temperature  * I do not utilize these - ER=Extended Range
2 - Humidity, Temperature, Outdoor Temp, Temp Alarm
 
Here only utilize Humidity, Temperature and Outdoor Temp for my sensors.  

 

[firepuppy]

@picta: that was spot on: I had Z15 configured as "Outdoor Temp"; as soon as I changed it to "ER Outdoor Temp", the reading changed from 100F to 66F (two other sensors I have in the garage currently read 63F & 65F with the garage doors open, so I think that's pretty close)!
 
I wonder why others haven't posted about this before, since it seems like an easy setup mistake to make...
 
Thanks again for the quick replies (and solution!)