Responded to service call for Lennox gas furnace (3 years old) making humming noise. Customer had already resolved initial rattling by adjusting humidifier damper from summer to winter position. Discovered water leakage in lower cabinet due to incorrect furnace pitch; removed front pads and re-pitched unit to proper orientation. Noted humidifier functioning improperly with clogged pad; recommended seasonal damper operation, but customer declined humidifier repair.
