Outdoor reset

FB

We recently had a Tringle Tube Instinct Solo installed. It displays more information than our previous boiler, a different brand. The contractor used the sensor from the previous boiler rather than installing the new one. We noticed the outdoor temperature displayed was always higher than the temperature on several thermometers we've placed next to the outdoor sensor. The contractor returned and installed the new sensor but the difference is still there; we saw a 10 degree difference during a cold snap. Please share your advice about correcting this issue.

PC7060

I’ve experienced similar issues and only resolved after moving the sensor away from the foundation. 

The heat loss through foundation raises the senses temp by 10-15 degrees relative to 5’ away from house. 

For example, I mounted this ODR sensor to the HVAC condenser unit. 

EBEBRATT-Ed

Where are the sensors installed? They should be on the North side of the building unless under a sun shield which does not always work.

If all else fails, look in the boiler manual. Ther is usually a chart that shows the resistance of the temperature sensor at differing outdoor temperatures. You kill the power to the boiler controls. Disconnect both outdoor temp sensor wires and put an ohmmeter on the two wires to check the resistance of the sensor versus the outside temp you measure with an accurate thermometer and checking with the readings the chart shows.

Usually if a sensor goes bad they are way out of wack and not 10 degrees off but anything is possible including a bad or damaged splice in the wire.

pedmec

Make sure your 2 conductors are in good shape and have no splices. Anything that causes added resistance in the wire will give an incorrect reading. is it always off (temperature) or does it change when the sun goes down?

EBEBRATT-Ed

What @pedmec mentioned is a good idea check it when it is dark out.