Upon arrival, system has a tripped rollout switch. Reset switch and performed test run of system. During system test, performed a combustion analysis to test integrity of the heat exchanger. Upon insertion of the combustion analyzer, the system read approximately 300ppm COAF, before immediately shutting off on CO threshold exceeded safety measure. System is not safe to operate and has been disabled to prevent operation. Due to the age of the system, 2009, replacement of the furnace is necessary.
