Complete 2 heating pm check. Change both filter, check safety and operation. Find both heating system operating normal. Find upstairs flame safety weak, customer want to keep check on flame safety and wait to replace. Find downstairs drain pan have water from 90% furnace due to frozen drain line in winter. System wire to shut off AC and not heat. Customer want to keep it that way. Told customer we can rerun drain to main house drain but not code.