Complaint: No Heat Main System isn't coming on at all. Cause of the issue is a short in the O circuit. Need to investigate further to find and repair short. Most likely location is in the wire going to the reversing valve. May have found 2 possible spots so they have been sealed until we arrive to investigate further. 3/29/23 Found a possible rub through on the O wire inside the outdoor coil during last appointment. Sealed spot and thoroughly inspected low voltage wiring. Didn’t see any issues with O circuit and system has been operating normally since last appointment. Customer will monitor and let us know of any changes in operation.