Upon arrival met with ken and began diagnosing system. Found that in heat mode or cool outdoor unit will not turn on. Checked outdoor unit and found that it was locked out on high head pressure, reset outdoor unit and condenser came on. Pressures in heat mode rose up to 600psi before turning off. Switched system to cool mode and pressures were ok. After speaking with ken came to a conclusion that the outdoor txv is restricting the flow of refrigerant causing high pressure lock out. Invoice/labor will be taken care of by Lennox. Part is under warranty through Lennox. Customer wants us to email past service and maintenance invoices along with information on cool care warranty. Lennox in Allen has parts in will call. Michael wants quote approved before any work done.