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Outdoor temperature sensor reading wrong on Buderus system
I have an approx 4 year old Buderus Logamax plus GB142 gas boiler heating my house in the Boston area. It is forced hot air with 3 blowers and 4 zone plus a few radiant floors.
A few days ago, the heat stopped working. The blowers would run and run when I turned up the thermostat(s), but the rooms wouldn't get hot.
The display on the GB142 showed about 66 degrees and 19PSI, but not running.
The outdoor temperature sensor (AM10?), however, is showing the wrong temperature. It is in the 50's out and the display is showing from around 79 to 82 degrees as the outside temperature. Reading the manuals, I guessed the WWSD was kicking in and the Buderus thought it was too warm outside to turn on the boiler. I tested this hypothesis by raising the WWSD temperature from the default of 70 to 85 degrees, and the boiler suddenly started working.
So, I'm presuming the outdoor thermostat is bad or the wiring is having problems or some such thing. The outdoor thermostat says Viessmann 7405121.
My question is -- is there anything I can do to further diagnose or fix or replace myself before I call in the pros and pay for a service call. Called Buderus already and no longer under warranty.
Thanks in advance.