Sent on another service contract fall checkout today. The homeowner says fan runs all the time. The is an older mvp without the new infinity control. Turn thermostat off and set fan to auto. Still getting 24v across G and Common. Pull thermostat off sub-base. 24v is gone but fan still runs. ?? I thought it may have been dipswitches?? Turned them all to off. Fan speed slows but still on continuously.
Ok. Told homeowner no one was in the office for me to contact to get help so they would call tomorrow and possibly send another tech out. Was there someone I overlooked?
I didn't think about it untill I got home. But how would I have checked to see if the relay on the board was perhaps stuck?? I can trouble shoot problems like these on older furnaces but trouble shooting the boards still confuses me.