Customer believed condensate pump was broken/ tubing prone. Upon inspection found secondary drain tube to not be run into pump and was dumping into emergency drain for furnace causing water to flood basement. Found drain line improperly terminated into sewage pipe. Located holes in heat exchanger. Informed customer of state of heat exchanger, advised due to safety concerns not to operate the heat. Left thermostat in off position. Customer getting quote on replacing furnace tomorrow between 2-5. Quoted repairs.