buffalobill wrote:

i do not have your furnace. here are some thoughts:
gas boiler burner problems i've has: i had to replace the pilot
assembly and adjust the pilot flame to properly surround the flame
sensor.
different problem: replacing gas valve was required.
you must refer to your service manual on this problem and the service
pages of your furnace's components.

owmytoe wrote:

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 ?


Hi,
It's funny he is talking about ignitor and flame sensor and you are
talking about pilot flame? Different subject.