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HW Vision-Pro question (How hard can it be?)
I recently installed a customer supplied thermostat (Honeywell VisionPro TH8110u1003) and found out it didn't work due to higher than expected voltage (32.8vac). Switched out the transformer and it worked. However, I'm still getting 29 volts. It doesn't seem likely that two transformers are having the same problem. Any thoughts? I also received a call this morning that the boiler fired, hit temp, shut down and the (indoor) temp dropped 5 degrees but boiler didn't re-fire. Could this be due to the 1 cylce an hour function?