Goodman 2-stage 3-ton HP with modulating propane furnace, comfortnet t-stat. Furnace put in last spring, HP put in 2 weeks ago. tech coming out for final charge adjustment and check when it gets hot out. Been running HP for cold mornings, works great.. But... I've been scrolling through the t-stat, and on several occasions, have found a high voltage trouble code. I logged the voltage coming into my house and it averages 246, min 245, with max spike of 252, logged for an hour about 10:00pm last night. This seems high to me, and if I caught 252 then I am sure I am crossing the threshold of 253 that I see in the manual as the upper limit. I think I should call my power company, do you agree?
So, this morning, calling for heat, 34 degrees outside. I'm on low stage heat, 31 degree temp rise across the coil, system calling for 812 cfm of air, while it is running I scroll through to see if the voltage spiked last night, no codes. T-stat gets satisfied so the heat cycle stops, all is good. I check voltage in my house, currently reading 247. Check for codes just for fun, find 2 new ones.. low indoor airflow, and no indoor airflow. No way. Air was flowing. Filters are pristine. I was here when the install tech checked static pressures, on low total static was .21, on high .48. Voltage issue? The only other thing that comes to mind is because it is comfortnet and the tech installed an outdoor transformer, there is only a need for 2 communication wires, so the tech re-used the low voltage wires from my old AC unit, he said since the run was so short (14 feet) he thought it would be okay, but I see in the manual they suggest twisted pair shielded wire. Could I be getting false error codes because of this? Thoughts?