Arrived on site, no error code present on system, but did find error codes stored in the thermostat for inducer fault and gas valve fault. cycled power on and off to reset system thermostat calls for heat, the inducer does not come on and goes off on error code 42 for draft inducer error. Verified we had 120 volts going to motor and good electrical connections. Examined venting and found brown sludge all on the inside of the venting…see photos Tested inducer motor was not creating enough vacuum to close pressure switches Submitted quote required form for repair of inducer motor