This is a York model G80C075120 Exterior forced air heater. The blower, igniter and fan work, the main burners ignite but then shut off 5 seconds later; cycle three times and then shut down. There is no error code. I?ve replaced the flame sensor Purged the gas valve, measured 9v from the control board on the two leads Re-inserted all the leads to the control board to insure good contact and bypassed the thermostat by leaving the ground attached and connecting the call for heat and blower wire twisted together with the same results. What am I missing ?
- posted
17 years ago