Nov 28, 2012 · The code went back to (H7) and the pressure was all over the place from 3psi to 13psi and it was hitting all numbers inbetween HVAC Technician: Phil , Mechanical Engineer replied 8 years ago Hello again, that range of symptoms all point to bad connections in the 81 pin gang connector.. we know that because as you replug it, you are getting these various changes.
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