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Performed oil furnace tune up cleaning, cleaned heat exchanger and flue pipe, flue pipe needs to be changed, also replace oil filter and nozzle, noticed nozzle sized was .75x70B furnace is rated at 1.00x70B replaced nozzle with 1.70 but when system was put in test after cleaning, found to running in rough conditions so replace nozzle to .75x70B, also electrodes are in bad shape flat ends, could not replaced pump strainer could not stop the flow of oil, customer has underground tank and thinks is pretty full, so level could be higher than burner no other way is stoping flow, performed smoke and combustion test, noticed high co numbers, adjust air to fuel mixture, left side of heat exchanger levels are ok good CO2, oxygen, and CO OK, but I right side co levels go higher, performed smoke test and failed test, base on manufacture technical support, heat exchanger has failed and repairs and replacement should be done, turned electrical switch off to furnace, explained to customer about heat