for Gahanna, OH
Customer stated he woke up and found that the house was cold. Found the thermostat blank and a flashing code on the furnace door. Upon arrival found thermostat blank and a flashing code of 24 on the board. 24 is “secondary low voltage fuse open” Found some wires crossed up from install and wiring on humidifier yesterday. Found W wire from thermostat got moved to the Common terminal on the board which caused the thermostat to blown the fuse when the furnace tried to turn on. Fixed wiring, replaced 3 amps fuse. Heat is running now.
Service work performed: Upon arrival found ac system running and keeping temp in the house. Checked pressures on system, 101/305 w/ 16SH and 2.5 SC, target SC is 10. Weighed in .5 lbs of r410a. Pressures now 103/330 w/ 2 SH and 12 SC. Moved blower to speed to medium but made the suction pressure worse. Moved back to high. Was here to replaced bad TXV today but found the source of the issues. Inside of the supply duct plenum there is a N coil that is not getting airflow through the right side causing the coil to almost freeze and causing the txv to not read correctly. The N coil needs removed and needs to have an A coil in its place. Talked to install coordinator about issues, he will be reaching out to the customer to schedule N coil removal and A coil install.