Arrived onsite for no heat service call. Performed diagnostic. The system turned up and fired up. Checked temperature rise and measured the system at 20 degree temperature rise 62/85. Checked air flow and check high fire. Check pressure sensing devices. Observed water noise from ac coil. Measured voltage to the terminal on the control board. Removed wires and found voltage on the y wire. Confirmed operation of the heat. Recommend replacing thermostat back plate possibly thermostat. Also could be short a in thermostat wiring packet but not reading continuity with y wire separated from thermostat back plate.
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