A package arrived, from Honeywell, this morning with a replacement programmer enclosed. I replaced the programmer, set the times and ran it through a test sequence. The system now appears to be functioning correctly. I will monitor it over the weekend but the prognosis looks promising.
Thanks to everyone who took the time to respond and to those at this thread //www.diynot.com/forums/plumbing/honeywell-st9400c-timer-and-no-hot-water.358649/#2932507
Also, thanks to those at Honeywell UK, who were very helpful.
Regards.
MartinFP
Thanks to everyone who took the time to respond and to those at this thread //www.diynot.com/forums/plumbing/honeywell-st9400c-timer-and-no-hot-water.358649/#2932507
Also, thanks to those at Honeywell UK, who were very helpful.
Regards.
MartinFP