On 2/23/2010 19:58, Arthur Shapiro wrote:
I ordered both thermostats today, although it isn't immediately obvious to me
how to get to the rear one, and even the front one is going to be awkward. I
fear the entire cabinet has to be removed, and that process isn't blatantly
apparent.

My guess is the valve coils. You can confirm by measuring the voltage
coming in to the coil assembly, which includes the ignitor and flame
sensor. If voltage is present after the gas cuts out prematurely, the
trouble is in the valve assembly.

If the trouble isn't with the thermostat(s), your parts supplier may
take them back if the packages are unopened.

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My return address has no numeric zero