Responded to no heat complaint at rental property with 18-year-old Coleman furnace. Diagnosed multiple issues including burner ignition failure, condensate drainage problems, and potential heat exchanger concerns based on erratic combustion analysis readings. Performed temporary repairs by clearing orifices, adjusting gas valve, disassembling draft motor assembly to clear condensate trap, and ensuring pressure switches/vacuum hoses were unobstructed to restore heat temporarily until permanent solution can be implemented.
