having read this a second time i suspect that it is a wiring problem.
first thing i would check is the wiring to the cylinder stat there should be a live feed from the clock usually no 3 terminal to the common terminal on the cyl stat, then there should be 2 lives back to the wiring center have you by mistake assumed the blue or black wire is a neutral?
first thing i would check is the wiring to the cylinder stat there should be a live feed from the clock usually no 3 terminal to the common terminal on the cyl stat, then there should be 2 lives back to the wiring center have you by mistake assumed the blue or black wire is a neutral?